192 PALEONTOLOGY OF THE EUREKA DISTRICT. 
of the volutions and the presence of stronger surface striz, as shown in the 
cast. The specific distinction is made on the difference in form of the volu- 
tions. 
Formation and locality—Lower Devonian of Atrypa Peak, Eureka Dis- 
trict, Nevada. 
Loxonema ? (sp. undt.) 
Shell turretiform, elongate; angle of divergence from the apex, 13° to 
15°. Volutions gradually enlarging, broad, moderately convex. Surface 
unknown. 
This species is represented by a fragment preserving three of the lower 
volutions. It is distinguished by its elongate, tapering spire, and broad vo- 
lutions, resembling in this respect Loxonema nobile, but differmg in the 
greater convexity and form of the volutions. 
Loxonema (sp. undt.) 
Shell terebriform. Spire rapidly ascending; angle of divergence about 
12°. Volutions narrow, rounded, gradually expanding. Surface obscurely 
shown by faint striz, which hend slightly backward a little below the suture 
and make a gentle curve forward to the base of the volution. 
This and the preceding species are associated with Loxvonema? subat- 
tenuatum ? and Bellerophon perplexa, in the lower fossiliferous horizon of the 
Devonian limestone of Gray’s Canon, Eureka District, Nevada. 
Genus BELLEROPHON Montfort. 
Of the six species represented in the collections from the Devonian 
limestone, two are undescribed and four are either identical with species 
described by Professor Hall, from the Devonian strata of the State of New 
York, or so closely allied to them that the grounds for a specific separation 
are not apparent in the specimens at hand. With a large number of more 
perfectly preserved specimens for comparison, it may be that some of the 
identifications will prove to be incorrect and to have been based on insufti- 
cient material. 
