258 PALEONTOLOGY OF THE EUEEKA 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. sublcevis 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 xxiv, 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 striae of growth that curve slightly forward ; at 

 the suture these are a little stronger. 



Dimensions: length, 18 mm ; breadth of body volution, 7 mm ; divergence 

 of apical angle, 24. 



In many particulars this species is closely allied to Loxonema cerithifor- 

 mis M. andW. (Geol. Surv. 111., vol. ii, p 379, pi. xxxi, figs. 13a-c), and 

 Chemniteia subconstricta De Koninck (Anm, Foss., plate Iviii, figs. 17 a, &). 

 It differs from each in having less convex volutions, and the surface striae 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. 



