38 Bulletin 6 38 



gera, but are much less common than the latter. This species 

 seems to be a variety of C. setigera; the same is probably, but 

 less certainly, true of C. lepida. 



Pteropoda. 



Tantaculites spiculus Hall. 

 This is a rare species in the Ithaca group. 



Styliolina fissurella Hall. 



This species is recorded by Williams from the Portage and 

 the lower part of the Ithaca group. 



Coleolus aciculum Hall. 



Common in the Portage and the Ithaca shale. 



Hyolithes aclis Hall, 



Lower Portage. — H. S. Williams. 



Cotiidaria congregata Hall. 



Occurs in the Ithaca shale rarely; more common in the mid- 

 dle and upper part of the Ithaca group. 



Coleoprion sp. 



This genus is recorded by Williams from the upper Spirifer 

 IrEvis zone of the Portage. 



Gastropoda. 



Euomphalus {Straparollus^ hecale Hall. 

 Ithaca group. — H. S. Williams. 



Pleurotomaria capillaria Hall. 



Common through the Portage and Ithaca groups. 



Loxonema delphicola Hall. 



This species is common in the lower part of the Ithaca group 

 above the Ithaca shale. 



Bellerophon leda Hall. 



This is a rather rare species in the upper part of the Ithaca 

 group. 



Bellerophon explanatusf Hall. 



A few specimens from the upper part of the Ithaca group, 

 stations 2-9, 2-14, and 2-16, are referred with doubt to this 



