PLATE 10. 



Page. 



Fig-. 1. Pteria (Oxytoma?) gasteodes 280 



a. VieAv of sandstone cast of left valve ; natural size. 



Fig. 2. Pteria (Pseudopteea) propleuea 281 



a. Left valve of young example ; front margin not quite perfect. 



6. Left valve of a someTvhat larger example. 



c. Left valve of adult example ; drawn from a gutta-percha cast 



of the sandstone mould of Mr. Meek's type-specimen of Ms 



Avidula {Pseudoptera) rJiyto])hora. 



Fig. 3. Baroda wyomingensis , , . 293 



a. Left valve ; natural size. 



6. Dorsal view of tlie same example. 



Fig. 4. Baroda subelliptica 294 



a. Lateral view ; left valve ; natural size. 



&. Dorsal view of the same, showing dorsal aspect of the teeth. 



c. Eight side view of a smaller example. 



d. Dorsal view of the same. 



Fig. 5. Trapeziuie micronema , 293 



a. Left side view ; natiiral size. 



Fig. 6. Trapeziibi truncatum , . 292 



a. Left side view ; natural size. 



b. Dorsal view of the same specimen. 



Fig. 7. Cyrena inflexa .... . . , 290 



a. Lateral view; right valve; natural size. 



b. Natural cast of right valve, showing muscular impressions and 



pallial line and sinus. 



