318 REPORT UNITED STATES GEOLOGICAL SURVEY. 



near the middle ; spire rather depressed-conical, subturreted ; volutions 

 five or six, convex ; last one forming' about three-fourths of the entire 

 bulk of the shell, and more than half its length, widest near its upper 

 part, and abruptly narrowed below, so as to present an obliquely obovate 

 form ; suture rather deep from the convexity of the volutions ; aperture nar- 

 row, subangular above, and narrowed below to a small notch at the base 

 of the truncated columella, which is provided with two small, obscure 

 plaits or folds, the lower of which is formed by the twisted margin of 

 the truncated inner lip, while the other is placed a little farther up ; outer 

 lip sharp, with its margin slightly retreating above, and more prominent 

 below, or near the middle. Surface ornamented with distinct vertical 

 folds that are usually well developed on the volutions of the spire, and 

 around the upper part of the body- whorl, but become obsolete below; 

 moderately distinct revolving hues also mark the lower part of the body- 

 volution, but these appear to become obsolete on its upper part, and on 

 those of the spire, as specimens are usually found. 



"Length, 0.37 inch; breadth, 0.21 inch; angle of spire, about 58°. 



" I am much perplexed in regard to the proper disposition to make of 

 this and the first two of the following species. In some of their charac- 

 ters they would seem to be related to certain types of the Mitrince, such 

 as Vulpecula Blainville ( = Vulpecula Klein), while in others they appear to 

 have affinities to the Cancellariidce, being much like the genus Admete. 

 Without being at all satisfied, however, that they belong properly to the 

 latter genus, I have concluded to refer them to it provisionally for the 

 present until better specimens can be obtained for study and compari- 

 son. My present impression is that they will prove not to belong to any 

 of the established genera, when all their characters can be clearly made 

 out. If it should be found desirable, however, to establish a new group 

 for their reception, I would propose for it the name Admetopsis, from the 

 resemblance of the shell to the typical forms of the genus Admete. 



"Locality and position. — Coalville, Utah; from Cretaceous beds be- 

 neath the lower heavy bed of coal at that place." 



A careful comparison of these fossil forms, together with some 

 obtained by one of Lieutenant Wheeler's surveying parties from the 

 north fork of Virgin Eiver, Utah, and others obtained from near Cedar 

 City, Utah, with typical living forms of Admete, satisfied me that they 

 are worthy of at least subgeneric separation from the last-named genus. 

 Accordingly, I so referred a form in my report to Lieutenant Wheeler, 

 which I then regarded as identical with Admete ? gregaria Meek, but which 

 is perhaps specifically distinct (U. S. Expl. and Sur. West of 100th Merid. 

 vol. iv, p. 198, pi. xviii, figs. 5 a and b). I am now much inclined to 

 regard these forms as generically disitnct from Admete, and so rank 

 them in this paper. 



The figures of this species on plate 9 were drawn by Mr. Meek, and 

 he had written the name u Admetopsis rliomboides " under the figures. 



Admetopsis stjbfusiformis Meek. 



Plate 9, fig. 7 a. 



Admete ? subfusiformis Meek 1873, An. Rep. U. S. Geol. Surv. Terr, for 1872, p. 502. 



" Shell subfusiform, with the length nearly three times the breadth ; 

 spire elongated, conical, turreted; volutions seven or eight, convex; 

 last turn more than half the entire length ; suture well defined in conse- 

 quence of the convexity of the whorls ; aperture narrow, equaling about 

 two-fifths the entire length of the shell, angular behind and narrowing 



