GEOLOGICAL SURVEY OF THE TEERITOPJES. 505 



some. The specific name is giveu in honor of my friend, William M. 

 Gabb, the paleontologist. 



Locality and position. — Coalville, Utah; from Cretaceous beds below 

 the lower heavy bed of coal mined at that place. 



Fusus (Neptunea*?) Utahensis, Meek. 



Shell of moderate size, short fusiform ; spire rather depressed, conical ; 

 volutions about fonr; those of the spire a little convex; last one large 

 and ventricose, ronnded or very slightly flattened around the middle 

 and contracted rather rapidly below into a narrow canal that is longer 

 than the spire, and more or less bent to the left; aperture rhombic, 

 angular above and narrowed and prolonged into the canal below. Sur- 

 face, (as determined from a cast in sandstone,) with obscure vertical 

 ridges, about twelve of which may be counted on the ijenultimate volu- 

 tion, while on the last, or body-whorl, they become nearly or quite obso- 

 lete. (Eevolving lines probably also marked the surface of the shell, 

 though no traces of anything of the kind are seen on the cast, except- 

 ing a shallow furrow above the sutnre on the volutions of the spire.) 



Length, including canal, about 1.90 inches ; breadth, 0.91 inch ; angle 

 of spire, about 07°. 



As in the last, we have not the means of determining the generic 

 characters of this species with any degree of certainty, and merely place 

 it provisionally in the genus Fusus with Neptunea in parentheses to in- 

 dicate that it may be found to belong to that group. It is a rather 

 decidedly larger shell than the last, with a distinctly less elevated spire, 

 and more obscure vertical ridge or varices. 



Locality and position. — Coalville, Utah ; from " Chalk Hill," considera- 

 bly above the lower heavy bed ot" coal mined there. Cretaceous. 



TuRBONiLLA (Chejmnitzia'?) Coalvillensis, Meek. 



Shell elongate-conical; volutions ten or eleven, moderately convex; 

 last one not much produced below, rounded or sometimes obscurely sub- 

 angular around the middle; suture well defined; aperture 'rhombic- 

 suboval, being angular above and ai^parently a little so below; inner 

 lip slightly thickened, rather deeply arched, a little reflected, and closely 

 appressed below ; outer lip thin. Surface ornamented by rather strong, 

 simi)le, regular, nearly or quite straight vertical ridges, crossed by regu- 

 larly disposed revolving lines, (about ten or eleven of the ridges and. 

 five or six of the revolving lines being seen on each volution of the 

 spire ;) while only the revolving lines are continued below the middle 

 of the body volution. 



Length of a large specimen, 1 inch; breadth, 0.40 inch; angle of 

 spire, from 20° to 25°. 



Xone of the specimens of this species yet seen are quite perfectly pre- 

 served at the base of the aperture. Some of them look as if there had 

 been a slight angularity there, while others, differing in no other respect, 

 X>resent appearaiices that leave room for doubt on this point. In some 

 of its characters this shell reminds one of the fresh-water Goniohasis, to 

 which I was at one time much inclined to refer it, and I am hardly 

 quite sure yet that it may not have to take the name Goniohasis Coal- 

 villensis. Many authors refer very similar shells to CJiemnitzia, but it has 

 not so large and produced a body volution and aperture as the forms 

 to which Mr. Conrad and Dr. Stoliczka propose to apply that name.* 



*The genus Chemniizia, iVOvhlgnj, as or ifjinallii proposed, is gcuerally rf?garded as syn- 

 onyms with Turhonilla, Eisso; but d'Orbigny himself, at a later date, seems to have 

 designed to use it for another group. 



