41 Ithaca Group 41 



station 6-1 in the Ithaca shale. It has not been reported before 

 from the Ithaca group. 



Phthonia lirata Hall. 



Ithaca shale. — H. S. Williams. 



Pholadella radiata Hall. 

 Ithaca group. — Hall. 



Spathella typica Hall. 



Common in the Portage and Ithaca groups. 



Schizodus chemungensis Hall. 



This is a common species in the upper part of the Ithaca 

 group at Ithaca. 



Schizodus chemungensis var. quadrangularis Hall. 



A few specimens have the distindlly erecft form of the variety 

 described as quadra^igularis by Hall. 



Glossites dcpressMs Hall. 



This species occurs in the Spirifer Icevis zone, and is occasion- 

 ally found in the Ithaca group. 



Grammy sia subarcuata Hall. 



This is a common species throughout most of the Ithaca 

 group. It also occurs in the upper Portage. 



Prof. Hall has recorded the three following species of Gram- 

 my sia from the "lower Chemung" at Ithaca: Grammy sia magna 

 Hall, G. circularis Hall, and G. elliptica Hall. 



Goniophora minor Hall. 



Rather common in the Ithaca group. 



Goniophora hamiltonensis Hall. 



This species occurs in the Ithaca group, but less commonly 

 than the preceding. 



Edmondia subovata Hall. 



Common in the upper part of the Ithaca group. 



Microdoti {Cypricardella') bellistriatus (Conrad) Hall. 



Common throughout most of the Ithaca group. It has not 

 been found in the Portage, 



Microdon gregarius Hall. 



This species is associated with the former, but is less common. 



