244 " NEW YORK STATE MUSEUM 



Rhipidomella assimilis Hall 



The single specimen from the Lower New Scotland identified with 



this species is the internal mold of the brachial valve; the front of 



-the mold is destroyed. The anterior part of the flabellate muscular 



scar is quite high. 



R. eminens Hall 



There are several specimens from the Upper New Scotland in the 

 collection which agree very closely with this species. Two are 

 young individuals and show very prominently the alternation of 

 stronger and finer striae. 



R. oblata Hall 



Shell well preserved and holds quite true to the type. It averages 

 in size 28mm by 34mm by 11 mm in length, breadth and thickness. 

 It is never an abundant species but is found in the Coeymans, New 

 Scotland and Lower Oriskany. 



R. tubulistriata Hall 



A single valve from the Upper New Scotland. It shows the 



characteristic fasciculation of the striae with the porelike openings 



on them. 



Gypidula angulata Weller 



One partial pedicle valve from the Coeymans answers to the 

 description of this species/ with the exception that it has three plica- 

 tions on the lateral slopes of the shell instead of but one; the one 

 next the fold is subangular and the most prominent, the other two 

 are faint and broadly rounded. 



G. galeata (Dalman) 

 Exceedingly common and well preserved in the Coeymans where 

 it occurs from the base to the summit. It appears suddenly and in 

 great numbers directly on the Favosites bed. A few specimens have 

 prominent and even plications and lack sinus and fold ; in these 

 respects they agree with the varietal differences pointed out by 

 Weller.2 



'Weller. Geol. Sur. N. J. 3:280, pi. 28, fig. 13^1. 

 " Geol. Sur. N. J. 3 :28o. 



