stanton.] CANCELLARIIDJE. 159 



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

 live or six, convex; last one forming about three-fourths the entire 

 bulk of the shell, and more than half of 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 narrow, 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 by 

 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 lines 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°.' r 

 The three forms to which Prof. Meek gave the names Admetef rJiom- 

 boideSy A.? gregaria and A J subfuxiformis, at the same time suggesting 

 Admetopsis as a generic designation for them, are very abundant in 

 certain layers near the base of the Cretaceous section at Coalville, 

 Utah, where the types were obtained. The surface markings of these 

 fossils are seldom well preserved and most of the examples are more 

 or less crushed and distorted. Prof. Meek states that the ornamenta- 

 tion is similar and variable in all the species, and his chief reason for 

 separating them seems to have been that some individuals are much 

 more slender than others. Dr. White remarks concerning them (loc. 

 cit.) that " after examining many examples I am much inclined to think 

 that they represent not more than two species at most." It seems to 

 me probable that there is only one variable species, but for the present 

 and until better collections shall fully decide the question, I shall refer 

 the short ventricose specimens to Admetopsis rJiomboides, and the slen- 

 der elongate ones to A. subfusiformis, treating A. gregarici as a synonym 

 of the former as Dr. White has already done. 



Admetopsis subfusiformis Meek. 

 PI. xxxiii, Figs. 1 and 2. 



Jdmete ? subfusiformis Meek, 1873, Ann. Kept. U. S. Geol. Snr. Terr, for 1872, p. 502. 

 sidmetopsis subfusiformis White, 1879, idem for 1877, p. 318, PL ix, Fig. 7. 

 f Admetopsis gregaria White, ibid., PL in, Fig. 5a, and U. S. Geog. and Geol. Sur. West 

 of 100th Merid., vol. iv, p. 198, PL xvm, Figs. 5«, b. 



Original description: 



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

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



