

PLATE 36. 



Fig. 1. 208. 9. MoDioLOPsis aviculoides. (Pag. 161.) 



1 a. A view oT the left valve of this specimen. 1 b. Dorsal view of the same. 



Fig. 2. 210. 1. AvicuLA trentoneksis. (Pag- 161.) 



2 a. A worn specimen, showing only obscure traces of the radii, with strong concentric ridges. 



2 i. A similar specimen, with obscure radii, having the anterior wing more extended. 



3 e. The opposite valve of a specimen of similar form as the last. 

 2 d. A large specimen of the left valve, with strong radii. 



Fig. 3. 211. 2. AvicuLA bluptica. (Pag. 162.) 



Fig. 4. 212. 1. Ambontchia belustbiata. (Pag. 163.) 



4 a. Left valve of a very synunetrical specimen. 



4 b. Right valve of a larger specimen. 4 c. Profile view of the same. The specimen appears to be ineqai- 



valve, which is due to the sliding down of one valve below the other, as is clearly shown in the lower 

 part of the figure, and in 4 b. 

 i d. A portion of the surface enlarged, showing the fine undulating stri», crossed by the concentric lines of 

 growth. 



Fig. 5. 213. 2. Ambokycbia orbicdlabis. (Pag. 164.) 



5 a. Right valve of a specimen, showing the muscular impression. 



5 b. Left valve, retaining a portion of the shell, which is beautifully ornamented by radiating and concentric 

 striae. 



5 e. Anterior profile view of a single valve. & d. A portion of the shell enlarged. 



Fig. 6. 214. 3. AmbONYCHIA AMTGDALIHA. (Pag. 166.) 



6 a. Right valve of this specimen. 6 b. Profile from the posterior side. 

 i> c. Profile of the anterior extremity, showing a kind of lunule below the beaks. 



Fig. 7. 216. 4. Ambomychia u^DATA. (Pag. 166.) 



7 a. Right valve of a specimen which is imperfect on the lower side. 

 7 b. Profile of the same, looking upon the posterior side. 



Fig. 8. 216. 6. Ahbonychia obtusa. (Pag. 167.) 



S a. Right valve of this species. S b. Profile view from the posterior side. 



Fig. 9. 217, 6. Ambonychia? (Pag. 167.) 



V a, b. View of the single valve, and profile of the same. 



