214 NEW YORK STATE MUSEUM 



PLATE 5 



(All origiuals in state museum) 



Eurychilina dianthus sp. nov. 



p. 78 



Fig. 



1 A partly extuliated right valve showing an elongate promi- 



nence on the internal cast, x 22 



2 Another right valve i*etaining the graiiulose surface, x 22 



8 The largest value observed; exhibits a faint, subcentral 



muscle impression, x 17 



9 Frontal view of same, x 17 

 Pebbles of gi*oup 7 



Eurychilina reticulata Ulrich 

 p. 76 



3 A right valve, x 22, fmm a i)ebble of group 6 



Eurychilina subradiata Ulrich var. rensselaerica var. nov. 



p. 77 



4 Left valve, x 22 



5 Section of same across central portion of valve, x 22 



6 Right valve, x 17 



7 Right valve; frill partly broken away and showing the internal 



cast. X 17 

 13 Entire right valve showing pits on surface and radially 

 striated border, x 22 

 Pebbles of groups 6 and 7 



Eurychilina obliqua sp. nov. 

 p. 79 



10 An entire right valve showing the broad, finely striated frill. 



X 14 ' 



11 Posterior view of same, x 14 



12 Ventral view of same, x 14 

 Pebble of group 7 



