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	1. Productus giganteus. Carboniferous Limestone. A, Interior of dorsal valve. B, Interior of ventral valve. C, Transverse section of valves. D, Hinge line of A: a, occlusor scars; d, divaricator scars; i, "reniform impressions"; ca, cardinal process; h, hinge line; p, brachial prominence; s, cavity for spiral arms; do, dorsal valve; ve, ventral valve


	2. Transverse section of lower valve (1); Section of upper valve showing two cavities (2); Upper valve showing the extent of the mud patch collected by a single worm (3); Tubes erected by polydora at the aperture of its tunnel (4); Upper valve showing an

Scallops: Early plicated stage. View of the right or lower valve. Note the smooth prodissoconch (pd)

3. Scallops: Early plicated stage. View of the right or lower valve. Note the smooth prodissoconch (pd) and siccoconch (d) areas, with the beginning of the sixteen plications (pl) of the adult. There are four teeth (te) on the byssal notch. (33); Scallop...viewed from left or upper valve (34); View of the anatomy of a slightly older scallop...as seen through the right valve. Note primary, secondary and tertiary eyes (e) and tentacles (t). The outer gill (og) has about twenty-five filaments, and begins to resemble the inner gill (ig) (35); View of right or lower valve of same scallop.... Note the five teeth (te) on the byssal notch (bn) and the beginning of the "ears (er). the two teeth back of the external border of the byssal groove are older, and have rounded rather than the pointed ends of the last formed teeth. The valves have become nearly equal, the hinge line straight, and the byssal groove (bg) can be traced back to the asymmetrical prodissoconch (36); View of upper left.... (37)


	4. Man standing inside Larner-Johnson flow control valve during installation at Gorge Dam Powerhouse, August 22, 1923


	5. Scroll case and Larner-Johnson flow control valve in unit no. 1 under construction, Gorge Dam Powerhouse, August 13, 1923


	6. Construction activities at Larner-Johnson flow control valve and scroll case in power generating unit no. 1, Gorge Dam Powerhouse, August 10, 1923


	7. Leptaena rhomboidalis (Silurian) A, External view of ventral valve. B, Interior of ventral valve; a, occlusor scars; d, pseudo-deltidium; d,f, divaricator scars; c,a, hinge are; t, teeth C, Interior of dorsal valve: a.a, anterior occlusor scars; p.a, posterior occlusor scars; c.a, hinge area; c.p, cardinal process; d, chilidium; s, dental sockets; v.s, vascular sinuses

View of the left half of cistella (Argiope) neapolitiana, which has been cut in two by a median longitudinal

8. View of the left half of cistella (Argiope) neapolitiana, which has been cut in two by a median longitudinal incision, to show the disposition of the organs. Partly diagrammatic. The inorganic part of the shell only is shown. The tubular extensions of the mantle ad the organic outer layer are not indicated, and hence the pores appear open.
1. The ventral valve.
2. The dorsal valve.
e. The stalk.
4. The mouth.
5. Lip which overhangs the mouth and runs all round the tentacular arms.
6. Tentacles.
7. Ovary in dorsal valve.
8. Liver diverticula.
9. Occlusor muscle; its double origin is snown.
10. Internal opening of left nephridium.
11. External opening of left nephridium.
12. Ventral adjustor. The line from 10 crosses the dorsal adjustor.
13. Divaricator muscle.

Salmon-Colored Pearl, weighing 14 1/2 pearl grains, lying loose where it was formed in a shell, from

9. Salmon-Colored Pearl, weighing 14 1/2 pearl grains, lying loose where it was formed in a shell, from Linn Junction, Iowa. The pearl is nearly hemispherical, or 'button-shaped,' somewhat one sided, but perfect above. It occupied a depression at the posterior end of the right valve, and had caused a marked outgrowth or protuberance of the other valve.
A-Interior view of the right valve, with the pearl in place

10. Salmon-Colored Pearl, weighing 14 1/2 pearl grains, lying loose where it was formed in a shell, from Linn Junction, Iowa. The pearl is nearly hemispherical, or 'button-shaped,' somewhat one sided, but perfect above. It occupied a depression at the posterior end of the right valve, and had caused a marked outgrowth or protuberance of the other valve.
B-Valve with the pearl removed, showing the depression where it had lain. C- The pearl itself taken out. D-Exterior view of the left valve, showing the protuberance corresponding to the pearl


	11. Lower (left) valve of Ostrea cuculata (1); Upper (right) valve exhibiting two blisters (2); Upper valve showing a larger blister (3)


	12. Pecten Jordani Arnold, Exterior of Right Valve #1;; Pecten Jordani Arnold, Exterior of Left Valve #2; Lyonsia pugetensis Dall, Exterior of Left Valve #3


	13. Workers beside Larner-Johnson flow control valve, draft tube and a portion of scroll case, unit no. 2, Gorge Dam Powerhouse, September 26, 1923


	14. Waldheimia (Magellania) flavascens. A, Interior of ventral valve. B, interior of dorsal valve


	15. Conchidium galeatum. TRansverse section. d, Dorsal valve; d.s. dorsal septum; s, socket plate; v, ventral valve; v.s. ventral septum; d.p, dental plate


	16. Muscle-scars of Lingula anatina. Inner survace of A, Pedicle-valve or ventral valve. B, Brachial or dorsal valve.


	17. Hinge of A, right valve, and B, left valve of Mulinia edulis King


	18. Three principal cast-iron pipe lines entering culvert beneath railray tracks. From left to right, the 4-inch clear-water supply, the 14-inch (reducing to 10-inch) reservoir supply, and the return 8-inch pond supply. In the forground a valve box is seen; the valve controls an emergency 'crossover' connection between reservoir supply and pond supply


	19. Exterior view of a washboard (Quadrula heros), showing the abnormal ridge on the right valve and the valley on the left valve, which are signs of the presence of apearl within


	20. Pacific Oyster, Ostrea turida Upper View of Closed Valves (1);; Inner Face of Ventral Valve (2);; Outer Face of Ventral Valve (3)

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