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Leptaena rhomboidalis (Silurian) A, External view of ventral valve. B, Interior of ventral valve;
1. 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
Productus giganteus. Carboniferous Limestone. A, Interior of dorsal valve. B, Interior of ventral
2. 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
Interior of the [Atrypa] seen from the dorsal side, showing brachial spires
3. Interior of the [Atrypa] seen from the dorsal side, showing brachial spires
Atrypa reticularis (Wenlock Limestone)
4. Atrypa reticularis (Wenlock Limestone)
Spirifera striata. (Carbinoferous Limestone) Showing brachial spires
5. Spirifera striata. (Carbinoferous Limestone) Showing brachial spires
Waldheimia (Magellania) flavascens. A, Interior of ventral valve. B, interior of dorsal valve
6. Waldheimia (Magellania) flavascens.
A, Interior of ventral valve.
B, interior of dorsal valve
Terebratula sella (Lower Greensand) d, Deltidium; f, foramen
7. Terebratula sella (Lower Greensand) d, Deltidium; f, foramen
Rhynchonella boueti (Cornbrash.). d, Deltidium; f, foramen
8. Rhynchonella boueti (Cornbrash.). d, Deltidium; f, foramen
Stringocephalus Burtini. Devonian. A, Interior or dorsal valve. B, Side view of interior of shell
9. Stringocephalus Burtini. Devonian.
A, Interior or dorsal valve.
B, Side view of interior of shell
Conchidium galeatum. TRansverse section. d, Dorsal valve; d.s. dorsal septum; s, socket plate; v, ventral
10. 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
Conchidium geleatum. Wenlock Limestone
11. Conchidium geleatum. Wenlock Limestone
Trimerella. A, Inner survace of pedicle-valve or ventral valve. B, Brachial plate.
12. Trimerella.
A, Inner survace of pedicle-valve or ventral valve.
B, Brachial plate.
Muscle-scars of Lingula anatina. Inner survace of A, Pedicle-valve or ventral valve. B, Brachial or dorsal
13. Muscle-scars of Lingula anatina. Inner survace of A, Pedicle-valve or ventral valve. B, Brachial or dorsal valve.
Figures illustrating the tubes in which Lingula anatifera lives. The upper figure is a view of the trilobed
14. Figures illustrating the tubes in which Lingula anatifera lives. The upper figure is a view of the trilobed opening of the tube. The lower figure shows the tube in the sand laid open and the animal exposed. The dotted line indicates the position of the body when retrcted. The darker portion is the tube of sand agglutinated by the secretion of the stalk.
Stages in the development of the larva of Terebratulina septentrionalis... The youngest larva has
15. Stages in the development of the larva of Terebratulina septentrionalis...
The youngest larva has two segments, a third then appears, the larva then fixes itself, and the second segment folds over the first and develops bristles round its edge.
Full-grown larva of Cistella neapolitiana with umbrella-shaped head, ciliated.
16. Full-grown larva of Cistella neapolitiana with umbrella-shaped head, ciliated.
Young larva of Cistella neapolitiana showing three segments, two eye spots, and two bundles of setae
17. Young larva of Cistella neapolitiana showing three segments, two eye spots, and two bundles of setae
Brood-pouch of Thecidium mediterraneum. Part of the wall of the pouch has been removed to show the clusters
18. Brood-pouch of Thecidium mediterraneum. Part of the wall of the pouch has been removed to show the clusters of larvae.
1. Mouth, overhung by lip.
2. One of the two median tentacles which are enlarged and modified to bear the larvae.
3. Wall of brood-pouch into which the median tentacles are folded.
4. Larva attached to the swollen end of the tentacles.
Semi-diagrammatic figure of the muscular system of Crania (after Blochmann): a, anterior occlusor;
19. Semi-diagrammatic figure of the muscular system of Crania (after Blochmann):
a, anterior occlusor; b, posterior occlusor; c, superior oblique; d, inferior oblque; e, retractor of the arms; f, elevator of the arms; g, protractor of the arms; h, unpaired median muscle. The dorsal valve is uppermost
View of the inner side of a valve of Lingula anatifera (after Frascois), to show the definite arrangement
20. View of the inner side of a valve of Lingula anatifera (after Frascois), to show the definite arrangement of the channels in the mantle:
a, position of mouth; b, position of anus
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