258 PALEONTOLOGY OF THE EUREKA DISTRICT. 
parisons with examples of B. textilis from the Warsaw limestone of Indiana 
exhibit strong specific resemblances which, in the absence of more perfect 
specimens to show possible differences, place the Eureka shell in the same 
species. 
Two other species occur in the same beds; one is like B. sublevis Hall, 
1856 (‘Trans. Albany Inst., vol. iv, p. 32), of the Warsaw limestone, and the 
other is of the character of B. ellipticus McChesney (see Trans. Chicago 
Acad. Sci., vol. i, p. 44), from the Coal Measures of Illinois, but there is not 
sufficient material to decide conclusively upon the specific relations. 
Formation and locality—Lower portion of the Carboniferous Group, 
east side of Secret-canon-road Canon on east slope of a small conical hill, 
Eureka District, Nevada. 
Genus LOXONEMA Phillips. 
Loxonema bella, n. sp. 
Plate xxiy, figs. 1, la. 
Shell small elongate-conical ; spire elevated, tapering to an acute point. 
Volutions fourteen to fifteen, very slightly convex, increasing gradually in 
size to the last one, which is a little enlarged and rather abruptly rounded 
below the middle. 
Suture close but not deep. Aperture subovate or subrhombic, longer 
than wide. 
Surface smooth to the unaided eye, but under a strong magnifying 
glass shows fine concentric strize of growth that curve slightly forward; at 
the suture these are a little stronger. 
Dimensions: length, 18°"; breadth of body volution, 7"; divergence 
of apical angle, 24°. 
In many particulars this species is closely allied to Loxonema cerithifor- 
mis M. and W. (Geol. Surv. IL, vol. ii, p 379, pl. xxxi, figs. 13 ac), and 
Chemnitzia subconstricta De Koninck (Anm. Foss., plate viii, figs. 17 a, 0). 
It differs from each in having less convex volutions, and the surface strize at 
the suture are not gathered in short crenulations. The cast has the form 
of the volution shown in both Meek’s and De Koninck’s figures. 
