190 PALEONTOLOGY OF THE EUREKA DISTRICT. 
Genus LOXONEMA Phillips. 
Casts of five species of spiral univalves occur in the lower fossiliferous 
beds of the Devonian limestone. They are in such a condition of preserva- 
tion as to render it difficult in the absence of surface-markings to determine 
their relations, although they evidently belong to the genus Loxonema. 
Professor Hall met with a group of species in the Upper Helderberg Group 
of the State of New York in a similar condition, and assigned specific names 
to those differing widely in form and proportions from those already de- 
scribed so as to be distinguished by these characters alone. This course is 
the only one to pursue with such meager and unsatisfactory material when 
it is desirable to specify the different forms, and as this is the case with the 
Nevada species, two of the five are described and referred to Loxonema, and 
a descriptive note given with each of the remaining three, one of which is 
provisionally referred to Loxonema subattenuata, of the Upper Helderberg 
Group of New York. 
Loxonema Hurekensis, h. sp. 
Plate xvi, fig. 8. 
Shell turretiform, elongate, robust; spire somewhat rapidly ascending, 
angle of divergence from the apex, 25°. Volutions, eleven or more in a 
specimen of 110"™ in length, slightly convex, and very gradually expand- 
ing from the apex. 
Surface unknown. 
Formation and locality—lLower horizon of the Devonian limestone; 
divide at the head of the Reese and Berry Canton, Eureka District, Nevada. 
Loxonema nobile, n. sp. 
Plate xvi, fig. 9. 
Shell robust, elongate, turretiform; spire rapidly ascending, angle of 
divergence from the apex, 15°. Volutions regularly increasing from the 
apex, slightly convex ;\ the three lower volutions have a united length of 
ORS 
