36o 



NORTH AMERICAN INDEX FOSSILS. 



XXXVIL KiRKBYA Jones. 



Distinguished from Moorea by the presence of a subcentral pit. 

 Surface ornament usually reticulated, sometimes with longitudinal 



Fig, 1666. a, Hollina radiata (85), right valve, X 14 5 ^> Jonesina gregaria (90), 

 left valve, X '5 5 <^> <^^ y J- bolliafortnis (91 ), left and dorsal views of entire carapace, 

 X 15 ; df d^ 1 Placentula niarginata (50), right valve, X '4 > ^» ^\ fi Kirkbya cym- 

 bula (92), left and right valves and ventral view, X 14 5 S^S'^ ^» ^^' ^ ^' germana 

 (93), left valve and end view, and right valve and ventral view, X ^4 > ^> ^'^ ji ^' 

 subquadrata (94), right valve, X ^4 J ^1 ^^y ^- centronota (98), right and end views, 

 X 14 ; A i^ ■> Octonaria curia (47), X *4 5 ''^> ^'^''» ^^j ^- clavigera (48), right ventral 

 and end views, X ^4> ^> ^''» ^- stigmata (49), right valve, X 18 ; /, p\ Bairdia 

 beedei (no), right and ventral views, X '4 > ^» ?''» ^> Bythocypris cylindrica (113), 

 dorsal left and posterior views, X H > -^j s' ^ Cypridea tuberculata var. tvyomingensis 

 (115), left and ventral view, X ^4 5 A ^^ ■> ^> ^' ■> Cytherella {?) rugosa (117), X '4 > 

 v-x^ C. ovatiformis (118). 



ridges. Genotype K. permiana Jones. Eight or ten species. Devonic- 

 Carbonic. 



92. K. cymbula Ulrich. (Fig. 1666, e,e',f.) Devonic. 

 Elongate, subquadrangular ; anterior angle acute ; reticulation 



fine. 



Bryozoan bed (Onondaga) group of Falls of Ohio. 



93. K. germana Ulrich. (Fig. 1666, g,g',h,h'.) Devonic. 

 Similar to preceding, but anterior end rectangular and reticula- 

 tion coarse. 



With the preceding. 



