FOSSILS OF THE DEVONIAN. 187 
Genus ECCULIOMPHALUS Portlock. 
Ecculiomphalus Devonicus, v. sp. 
Plate vi, figs. 6, 6a. 
Shell discoid. Volutions, one or two?, widely separated; rapidly 
enlarging; section subtriangular, rounded a little above and also from the 
inner and outer margins down to the obtusely angulated ventral surface. 
Surface unknown. 
A comparison with the figures given by Portlock of the types of the 
genus EH. Bucklandi and E. minor (Rep. Geol. Londonderry, Tyrone, &c., 
1847, pp. 411, 412, pl. xxx, figs. 10-12) shows our Devonian species to be 
generically identical with them, although the inner portion of the whorl or 
whorls is broken away, and the surface of the shell destroyed. 
Formation and locality—Lower Devonian of Atrypa Peak; Eureka 
District, Nevada. 
Genus STRAPAROLLUS Montfort. 
Straparollus Newarkensis, n. sp. 
Plate xvi, figs. 7,7 a. 
Shell small; spire slightly elevated above the general plane Umbili- 
cus narrow, scarcely exposing the inner whorls. Volutions four or five, 
very gradually expanding to the outer volution, which increases a little more 
rapidly; transverse section rounded, subangular or obscurely subquad- 
rangular; obtusely angular above and below with a slightly oblique, convex, 
or flattened periphery; gently rounded on the upper surface to the strongly 
defined suture, and on the lower surface to the more sharply rounded edge 
of the umbilicus. 
Surface of the shell marked by concentric striz and lines of growth 
parallel to the margin of the aperture. From the suture they curve slightly 
backward over the upper margin, and then forward to a little below the 
center of the periphery, recurving gently backward to the margin of the 
umbilicus. 
