716 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



stripes of coloration of the shell. These are now brownish in color, 

 while the general surface is buff; both doubtless different from those 

 that characterized the shell while living, but no doubt correctly repre- 

 senting them in shape, relative position, and contrast. 



Length 10 millimeters ; breadth 7 millimeters ; height 5 millimeters. 



This species resembles in many respects the N. (F.) patelUformis 

 Meek, especially the variety weherensis White, but it differs from the 

 former in form, and from the latter in being without any trace of radiat- 

 ing, raised lines or costse, in the greater prominence of the umbonal 

 portion, and its more conspicuous apex. Its coloration is not taken into 

 account, as its preservation is deemed only accidental. 



Position and locality. — Laramie Group, Black Battes Station, Union 

 Pacific Eailroad, Wyoming. 



Genus GONIOBASIS Lea. 



Goniohasis endlichi (sp. nov.). 



Shell moderately elongate-conical ; spire with straight or slightly con- 

 cave sides ; volutions six or seven, much and nearly regularly convex, 

 the last one slightly inflated ; suture well defined, and appearing unu- 

 sually deep on account of the convexity of tbe volutions; aperture ovate, 

 its distal end angular, its front somewhat narrowly rounded, and without 

 a sinus ; outer lip apparently sharp ; inner lip with a thin reflected 

 callus, more developed toward the front ; columella gently arcuate. 



Surface marked by fine but distinct lines of growth, which are crossed 

 by very numerous, fine, revolving, raised lines, giving it a cancellated 

 appearance under the lens. In addition to these, there are usually from 

 four to six much larger, nearly equidistant, revolving, raised lines of nearly 

 equal size, visible upon the volutions of the spire, and ten or twelve of 

 the same upon the body-volution. These larger, revolving, raised lines 

 are sometimes absent or obsolete, but the smaller markings are always 

 present. 



Length about 22 millimeters; diameter of body-volution 11 milli- 

 meters. 



This species is evidently nearly related to G. nehrascensis and G. 

 tenuicarinatus M. & H., and should perhaps be referred to PachycJieilus 

 Lea, but the difficulty of learning the exact character of the lip leaves 

 that matter in some doubt. 



Specific name given in honor of Dr. F. M. Endlich. 



Position and locality. — Laramie Group, 7 miles west of Evanston, Wyo., 

 near the boundary line between Wyoming and Utah. 



Genus VIVIPAEUS Lamarck. 



Yiviparus pmdentia (sp. nov.). 



Shell depressed-subconical ; spire short ; volutions five and a half or 

 six, including the minute ones of the apex, convex; last one considera- 



