FOSSILS OF THE DEVONIAN. 193 
Bellerophon perplexa, n. sp. 
Plate xvii, figs. 6,6 a, b. 
Shell subglobose, the transverse and lateral diameters being 27™™ and 
33™™, respectively, in a medium-sized specimen. Volutions five or six, 
broadly rounded on the dorsum, subangular on the dorso-lateral angle of 
each volution, and sloping rapidly into the broad, open umbilicius from the 
dorso-lateral angle. Each volution embraces the dorsal surface of the pre- 
ceding, leaving the entire umbilical slope of each exposed. The extreme 
transverse section of each volution is equal to four times the lateral section 
as it is measured midway, or at the carina. The aperture is probably sim- 
ilar in form to the transverse section of the last volution, as in a number of 
examples examined no evidence of any expansion was observed. The dor- 
sum has a narrow, well-defined carina. 
Test varying in thickness from .75™" to 1.50™™, with the variation in 
the size of the shell. 
Surface marked by strong striz; originating on the inner margin of the 
umbilical lobe they cross it obliquely, curving slightly and extending back- 
ward at an angle of 45° to the dorso-lateral angle over which they curve, 
retaining a backward slope of 15° to the dorsal carina. 
The largest specimen in the collection has a transverse diameter of 
50™, The test is removed from the outer portion of the last volution, the 
mold retaining only the slight dorsal carina, a feature that in another speci- 
men is obsolete; this, however, is rarely the case as in most examples it 
occurs on the outer volution and may be traced on breaking away the 
volutions to the second or third, where the transverse diameter is five mil- 
limeters. 
Formation and localities—Lower horizon of the Devonian limestone, 
Comb’s Peak, Gray’s Canon and Atrypa Peak, Eureka District, Nevada. 
Bellerophon Combsi, n. sp. 
Plate xvii, figs. 9, 9a, b. 
Form large, robust, subglobose; exterior shell unknown. In the cast 
the body volution is large, nearly if not quite concealing the inner volu- 
tions; broadly rounded on the dorsum and gradually expanding towards 
13 0D Ww 
