146 



NEW YORK STATE MUSEUM 

 PLATE 4 



H JL 14 15 W 



12 13 



X 



19 20 



7 



24 



€)0 



23 24 



c 



16 lr 



O© 



28 



31 



g ^ 38 V <g 

 3 34 



36 3? 



Cornulites arcuatus Conrad 



Page 105 

 G. 



i Internal cast of a stout, rapidly tapering specimen. Natural 

 size. Rochester (Arey collection) 



2 Internal cast of a slender, slightly arcuate specimen from a 



gutta-percha squeeze of a natural impression. Natural size. 

 Lower Shelby bed (N. Y. State Museum) 



3 A specimen with slightly different character of the annula- 



tions. X2. Rochester (Arey collection) 



4 A specimen retaining part of the shell and natural surface. 



Upper Shelby bed (N. Y. State Museum) 



5 An internal cast of a large specimen. Natural size. Rochester 



Crania sp. 



Page 38 



Single specimen observed. X2. 



Rochester (Arey collection) 



