122 INVERTEBRATE PALEONTOLOGY. [WHITE. 



the wing and body volution, twenty-nine millimeters; diameter of the body 

 volution, fifteen millimeters. 



This species differs from all others known to me by the projection of. 

 the outer border of the wing beyond the posterior process. 



Position and locality. Sulphur Creek Group; Upper Kanab and Sink 



Spring, Utah. 



Genus LUNATIA Gray. 



Lunatia Utahensis (sp. nov.). Shell globose ; spire small, acute, but 

 not much extended ; volutions about eight, the last one much inflated, 

 suture moderately impressed ; aperture semilunar, somewhat abruptly 

 rounded anteriorly, callus of the inner lip apparently not much thickened, 

 but thicker anteriorly than posteriorly. Surface marked by the ordinary 

 lines of growth. 



Length from the apex to the anterior end of the aperture about four 

 centimeters; diameter about three centimeters. 



Position and locality. Salt Wells Group; Coalville, Utah. 



Genus GONIOBASIS Lea. 



Goniobasis Clelurni (sp. nov.). Shell large, gradually tapering from the 

 last volution to the apex, the sides of the spire being only slightly convex; 

 volutions apparently nine or ten, gradually increasing in size, .the last one 

 not being proportionally larger than the others; suture slightly impressed; 

 sides of the volutions nearly flat or slightly convex, the outer and anterior 

 sides of the last one broadly and regularly convex; aperture ovate; outer 

 lip broadly sinuate. 



Surface of the spire marked by strong longitudinal or slightly flexed and 

 oblique ridges or folds which disappear toward the aperture of the last volu- 

 tion. Upon the anterior surface of the last volution beyond the distal end 

 of the aperture, there are several slightly raised revolving lines, and the 

 edges of the vertical plications are also sometimes seen to be faintly crerm- 

 lated as if by incipient revolving lines. 



The specimens of the collection have all lost the apex, but the length 

 of a full grown one is estimated at five centimeters; diameter of the last 

 volution, nineteen millimeters. 



