199 



,T^:;^f^-;— ■-' 



StROPHHODOXTA ( FHOIJDOSTHOI'IIIA ) XACRKA. (Hall.) 



(Fio-. 1()L>.) (Pal. N. v.. Vol. IV., p. 104, IM. XVIII.) 



Dis tingiiit^hinfi; ('hiunc- 

 ters. — Small .size; convex 

 character; smooth and na- 

 creous surface; interior of 

 the brachial valve with tliree 

 diverging- ridges in front of 

 the muscular area. 



Found in the Encrinal 

 limestone, at Section ^> 



(common); in the Modio- Fig. lOa. Stropheodonta nao-ea. Dorsal, 



7 1 1 ^ ^ 1 , V profile and ventral views of a specimen; in- 



inorpnaSUbanitn l)ecl(rare): tenors of pedicle and brachial valves (from 



Trilobite beds (especially 



the lower), at Section 8, on the Lake Shore and in Avery's 

 Creek (fre(]uent); shale below^ the Trilol)ite beds, in Avery's 

 Creek (rare). Schuchert refers this s])ecies to .S'. (P.) 

 iowmisis. (Ow^en.) ( Bull. 87, U. S. G. S. ) 



Sthopheodoxta (Leptostkophia) juxia. Hall. (Fig. 

 108.) (Pal. N. Y., Vol. IV., ]). 108, PI. XVHI.. N. ttxtilk.) 



^'litii^^ilt^ 



Fig. 103. Stropheodonta Junia. Dorsal view of a large individual, showing the cardinal 

 area of the ventral (pedicle) valve; enlargement of the surface striae (from Hall). 



