WHITEAVES.] LARAMIE AND CRETACEors IN VERTEBRATA. 69 



CoRBULA PERUNDATA, Meek and Hayden. 



Corhula perundata, Meek and Hayden. ls,",(i. Pr,,e. Ac. Nat. Sc, Phil. vol. 

 VIII., p. 116. 



ileek. 1876. Eep. U. s. G,,ol. Surv. Terr., vol. IX., p. .530, 

 pi. 40, figs. 4, a, b, c, d. 



Creek " about fourteen miles north-eastward from the most eastern 

 of the Three Battes," G. il. Dawsou, 1874; very abundant: seepage 

 122 of Dr. Dawson's " Eeport on the ( i-eology and Eesources of the 

 region in the vicinity of the Forty-ninth Parallel. Abundant also at 

 all the localities at which C. suhtrlgonalis has yet been collected at this 

 horizon in the " Belly Eiver Series." As alreadjr stated on page 9, 

 Dr. C. A. White thinks that C. perundata is not specifically distinct 

 from C. subtrigonalis. 



GASTEROPODA. 



EhtTOPHORUS (?) GLABER. (N. Sp.) 



Plate 10, figs. 4 and 4f(, h, r. 



Shell (when adult or nearly adult) ovately subfusiform, its length 

 being about twice its maximum breadth : spire conical, moderately 

 elevaced : axis and base imperforate. Volutions about six, increasing 

 rapidly in size, those of the spire obliquely compressed at the sides, 

 the one next to the body whorl being moderately convex and the 

 earlier ones much less so : suture lightly impressed. Body whorl large 

 and long, though its length is rarely or never quite twice as great as 

 its maximum bi'eadth, obliquely compressed next to the suture, most 

 prominent and somewhat shouldered a little above the middle, below 

 which it narrows gradually into the more or less pointed or very nar- 

 rowly rounded base. Aperture elongated and narrow, jjointed both 

 above and below, but most acutely so aliove: columella beai-ing at 

 least one fold, which is prominent, oblique and situated at a short dis- 

 tance from the base : outer lip thin and apparent!}- simple. 



Surface polished, nearly smooth, marked only by minute and jjarallel 

 lines of growth, which are faintlj-, minutely and shallowly curved 

 backwards immediately next to the suture. Test rather thin. 



