PLATE 47. 



Page 



Figs. 1-7. Athykis CORA 291 



1, 2. Dorsal and ventral views of a small and well preserved specimen. 



8-7. Dorsal, ventral, profile, cardinal and front views of a full grown and perfectly formed 

 specimen; the shell is somewhat exfoliated, aud does not show the exterior surface char- 

 acters. 



Fig. 8. Athyris spiuiferoides 28r) 



8. The ventral side of the specimen fig. 31, pi. 46, showing the intercolated lamellaB of the 

 syires near the upper part between the cones. 



Figs. 9-20. Athyris ANGELICA 292 



it- 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 valveu. 



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 vontricose indi- 

 vidual. 



20. Enlargement of the surface to show the lamellose concentric strite and the finer radiating 

 lines. 



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 stria;. 



31. Dorsal view of a ca-st of the species, showing the muscular impressions. 



32. 38. Ventral views of casts, showing the muscular impressions and filling of the dorsal cav- 



ity. The species not verified. 



Figs. 34 - 88. Meristella sc itula 302 



34, 35. Dorsal and ventral views of a s|)ecimen of medium size. 

 36-88. Dorsal, ventral and profile views of a larger individual. 



