TKILOIMTBR .''.' 



CypbupU (alcnmuU.1 



Genus i -Y I'M. \S1MS. Burmeister, 1848. 

 CTPHASPIS ? OALXNKNSIS, n. sp. 



This muni' is applied to a single minute cranidium bearing an ellipsoidal, very 

 convex glabella surrounded by deep dorsal furrows and tapering about equally 

 toward Ixith extremities; and with narrow convex fixed cheeks. All evidence of the 

 lobation of the glal>ella is very obscure, indeed consisting only of a slight lateral 

 indentation on one side, at about the middle of its length, and of three equidistant 

 elevated lines on the other. The surface is smooth or very faintly granulose on the 

 glabella and more coarsely papillate on the cheeks. 



Fig. 81 Cranidium of Vyphtupitf galenenii*. (x S). 



The fossil evidently represents an undescribed species and may therefore take 

 the name here proposed, but its generic relations remain quite uncertain. In 

 general appearance, form of glabella, convexity of cheeks and curve of facial 

 sutures, it is like Cyphaspis, but it altogether lacks the basal glabellar lobes of that 

 genus. 



Two other species from the Lower Silurian faunas of America have been referred 

 to Cyphatpis: C. girardeauensis Shnmard,* a normal representative from the Trenton 

 horizon, and C. ? brevimarginata Walcott,f from the Pogonip group of Nevada, a 

 form having characters not unlike those of C. ? galentnsi*. 



Gol. Kept. MlMOurl. p. 197. pi. viu. B(. 11. 1H6. 



l-.lB-o.it Eureka DMrl.K.f NI-TMU. p. . pi. XH. fig. 10. IW. 



Formation and totality . The MinnedoU specimen In from the Galena nhalea at Cannon Falln. 



