PLATE 47. 
Page 
Figs.1-7. Athyris cora.. 291 
1, 2. Dorsal and ventral views of a small and well preserved specimen. 
3-7. Dorsal, ventral, profile, cardinal and front view's of a full grown and perfectly formed 
specimen; the shell is somewhat exfoliated, and does not show the exterior surface char¬ 
acters. 
Athyris spiriferoides. ........... 285 
The ventral side of the specimen fig. 31, pi. 46, showing the intercolated lamellae of the 
spires near the upper part between the cones. 
Figs. 9-20. Athyris angelica. 292 
9-13. These figures are from specimens which preserve the external shell and surface charac¬ 
ters, and illustrate the great variety of form presented by this species. Fig. 9, is of a 
dorsal valve; the others are of ventral valves. 
14. A cast of the ventral valve of a young individual. 
15. The ventral side of a large and rather elongated specimen, showing the muscular markings 
and filling of the rostral cavity. 
16-19. Dorsal, ventral, profile and front views of the internal cast of a short ventricose indi¬ 
vidual. 
20. Enlargement of the surface to show the lamellose concentric striae and the finer radiating 
lines. 
Fig. 8. 
8. 
Figs. 21-33. Athyris polita... 293 
21, 22. Dorsal and ventral views of a small individual. • 
23-26. Dorsal, ventral, profile and front views of a specimen of the ordinary size and propor¬ 
tions. The shell has been almost entirely exfoliated from the specimen. 
27 - 29. Dorsal, ventral and cardinal views of a more gibbous and more perfect cast of the 
species, showing the muscular impressions and filling of the rostral cavity. 
30. The exterior of a nearly perfect specimen, showing the surface strim. 
31. Dorsal view' of a cast of the species, showing the muscular impressions. 
32. 33. Ventral views of casts, showing the muscular impressions and filling of the dorsal cav¬ 
ity. The species not verified. 
Figs. 34-38, Meristella scitula ............ 302 
34, 35. Dorsal and ventral views of a specimen of medium size. 
36-38. Dorsal, ventral and profile views of a larger individual. 
