PLATE 5. 



Page. 



Fig. 1. Cai.lista (Aphrodlsa ?) tenuis 188 



1, a. A left-side-view of I In- type-specimen, with a part of the shell removed. 

 1, 6. A dorsal view of same. 

 1, c. Au anterior view of same. 



1, d. A right-side view of a specimen with most of the thin shell removed so as to show the 



muscular and pallial impressions on the internal east. 

 Fig. 2. Callista (Dosixiopsis?) orbiculata 186 



2, a. An internal cast of a small specimen, showing muscular and pallial impressions. 



2, b. The same, of a larger individual, with a somewhat deeper and narrower pallial sinus. 



2, c. A posterior dorsal view of the same. 



Fig. 3. Inocekamus exogyroides - - - 46 



:'., a. An internal cast of the left valve of the type-specimen. 



3, b. Another view of the same. 



3, c. Anterior view of same. 



Fig. 4. Piioladomya papyracea : 217 



A, a. A left-side view of the internal cast of type-specimen, retaining thin inner lamina? of the 

 shell. 



4, b. A dorsal view of the same. 



Fig. 5. Inoceramus fragius '- 



Au imperfect cast of a right valve, with the wanting portion restored by lighter flat 

 shading. [From the original locality.] 



