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Structure of the branchiae or gills of peleopods, seen diagramitacally in section: A, Protobranchiata; B, Filibranchiata; C, Eulamelbranchiata; D, Septibranchiata. c. c. external row of filaments; i, i, internal row of filaments; e, external row or plate folded back; L, internal row folded back; f, food; m, mantle; n, septum; v, visceral mass
Purtumnus variagatus, male
a, external antenna; b, external jaw-foot; c, tail or abdomen
Senators, including Henry M. Jackson and Warren G. Magnuson, meeting with Paul Martin, Canada's secretary of state for external affairs, Canadian Prime Minister Lester B. Pearson, and President Lyndon B. Johnson to discuss nuclear testing, Washington, D.C., January 22, 1964
Ventral view of adult female crab showing swimmerets. A, inner swimmerets to which the eggs are attached; B, external openings of oviducts
External Anatomy of a Lobster
C, carapace; e, eye; g, gill; m, metastoma; n, endopodite; p, epipodite; x, exopodite; I-VII, abdominal segments; 1, antennula; 2, antenna; 3, mandibles; 4, 5, maxille; 6, 7, 8, maxillipods; 9, big pincer; 10-13, walking-feet
Balanus. A, external view; s, Scutum; t, tergum
Polypterus congicus, a Crossopterygian fish from the Congo River. Young, with external gills
Polypterus congicus, a Crossopterygian fish from the Gongo River. Young, with external gills
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 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.
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.
Sturcture of the Breathing Organs of Porcellio scaber
A, Exopodite of first pleopod, showing the tuft of air-tubes ('pseudo-tracheae'), seen through the transparent cuticle; B, vertical section through same; C, part of section more highly magnified; art, Point of attachment of exopodite to peduncle; c, cuticle; gr, grooved area of cuticle; hy, hypodermis, or layer of cells under the cuticle; n, nucleus of hypodermis cell of air-tube; o, external opening; tr, air-tubes
Solea vulgaris : Body cavity of the female Common Sole after all the viscera have been removed except the ovary and kidneys, which are lift in situ. The wooden rod passes through the anus, the blue probe pass through the external aperture of the common oviduct up into the left ovary, the black bristle passes into the urinary bladder which lies beneath the oviduct
Embryo Ray and its Means of Nourishment
Early shark-like embryo of the Indian Bat-ray (Pteroplataea micrura).... Only a few of the external gill-filaments are represented
Adult Female Lobster with External Eggs. Ventral view
Adult Female Lobster with External Eggs. Dorsal view
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)
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