PLATE 39. 
Legend: t. Teeth. a. Adductor scars. 
b. Dental sockets. r. Diductor scars. 
A Delthyrium. j. Cardinal process. 
ANOPLOTHECA, Sanppercer. 
Page 801. 
ANOPLOTHECA VENUSTA, Schnur. 
Figs. 1, 2. Ventral and dorsal views of an average specimen, enlarged. 
Fig. 3. An internal cast of the pedicle-valve enlarged ; showing the diductor 
scars and vascular impressions. 
Fig. 4. The interior of a brachial valve enlarged; showing the cardinal pro- 
cess and muscular impressions. : 
Fig. 5. An enlarged view of a specimen; showing by the removal of a portion 
of the pedicle-valve, the spiral cones, their form and direction, 
Middle Devonian. Eifel, Germany. 
(Figs. 1, 2, ScHNUR; 3, 4,5, SANDBERGER.) 
ANOPLOTHECA LEPIDA, Goldfuss. 
Fig. 6. Dorsal view of anormal example. 5. 
Fig. 7%. The interior of a portion of the pedicle-valve ; showing the teeth 
resting on the thickened shell-wall and the median septum grooved 
for the reception of the extremity of the jugum. 
Middle Devonian. Gerolstein, Eifel. 
CQELOSPIRA, Hatt. 
Page 802. 
Ca@ospira concava, Hall. 
Fig. 8. Ventral view of an averageexample. X 2. 
Fig. 9. Dorsal view of asimilar specimen. X 2. 
Fig. 10. The interior of a brachial valve ; showing the character of the cardina- 
process and socket-walls and the median thickening between the 
muscular impressions. x 3. 
Lower Helderberg group. Near Clarksville, N. Y. 
Ca osprra Camiua, Hall. 
Figs. 11, 12. Dorsal and profile views of a typical specimen. 2. 
Fig. 18. The interior of a brachial valve ; showing the elevated and somewhat 
recurved hinge-plate. » 4. 
Fig. 14. The interior of a pedicle-valve ; showing the open delthyrium teeth 
and muscular impressions. 4. 
Corniferous limestone. Calcdonia, N. Y. 
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