192 PALEONTOLOGY OF THE EUREKA DISTRICT. 



of the volutions and the presence of stronger surface striae, 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 nolile, but differing in the 

 greater convexity and form of the volutions. 



Loxonema (sp. uudt.) 



Shell terebriform. Spire rapidly ascending; angle of divergence about 

 12. Volutions narrow, rounded, gradually expanding. Surface obscurely 

 shown by faint striae, which bend 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 Loxonema / sulat- 

 teniiatuin ! and Belleroplion perplexa, in the lower fossiliferous horizon of the 

 Devonian limestone of Gray's Cafion, Eureka District, Nevada. 



Genus BELLEROPHON Moutfort. 



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 insuffi- 

 cient material. 



