112 NEW YORK STATE MUSEUM 



PLATE 5 



Cryptonella (?) fausta sp. nov. 



Page 38 

 Fio. 



1-3 Dorsal, profile and ventral views of a typical example 

 4-6 Similar views of another shell showing the depressed con- 

 vexity of the brachial valve 

 7, 8 Ventral and profile views of another example 



Oriskania sinuata sp. nov. 



Page 38 



9, 10 Dorsal and profile views of a specimen which show the 

 convexity of the brachial valve 



11 Another example showing the same characters 



12 An example showing the muscular and vascular scars on 



a cast of the brachial valve 



Megalanteris ovalis Hall 



Page 40 



13,14 Dorsal and profile views of a characteristic example 



15 An enlargement of the surface showing the imperf orate 



-exterior layer and the perforate inner layer of the shell 



16 An internal cast of the pedicle valve showing the muscular 



and vascular scars 



Rensselaeria ovoides Eaton 



Page 39 



17, 18 Profile and dorsal views 



19 Internal cast of a pedicle- valve showing the muscular 

 impressions 



Camarotoechia sp. cf. dryope Billings 

 20, 21 Profile and ventral views of an imperfect specimen 



Camarotoechia oblata Hall 

 22 An internal cast of a pedicle- valve 



