whiteaves.] laramie and cretaceous invertebr ata. 21 



;Melania Wyomingexsis, Meek. 



Melan'ia (Goniobasis .') Wyomingcnsis ^lee^. lS7:i. Kep. U. S. Geol. Surv. for 



1S72, p. 516. 

 ^£J'ln;a laruada, White, 1876. Powell's Eep. Geol. Uinta Mts., p. 131. 

 Melanhi Wyomhigensis, (Meek) "White. ISSO. U. S. Geol. Surv. Terr., Coutr. to 



Pal., Xos. 2-S, p. 95, pi. 28, figs. 6a ami b. 



Figured also on PI. 2i ;, figs. 1, 2 ami 3 of Dr. 



White's Eev. X'.in-IMarine Poss. N.A. 



Upijer Belly Eiver, twenty-two and twenty-three miles above the 

 mouth of the Waterton, E. G. JlcConuell, 18S1 . two characteristic 

 sj^ecimens and two fragments. This species comes from the basal 

 beds of the Laramie referred to in connection with the description of 

 Corhula pei-angulata. 



GoxioBASis Xebhascensis, Meek and Hayden. 

 Plate 3, figs. 4 and -la. 



Mdarria X,:hrouxusix, IMeek and Havden. 1S56. Proc. Ac. Xat. Sc. Phil., vol. 



VIII., p. 124. " 

 '7o/i('o6os(s ^>'jrit.?c</-ie;.*, M. and H. (White). 1S75. Eep. Geogr. and Geol. Surv. 



W. r,f 100th Mer., Wasliington. p. 213, pi. 12, figs. 9a, b, c. 

 Goniohash Xthrasceasix, Meek. 1876. Eep. U. S. Geol. .Surv. Terr., vol. IX., p. 



565, pi. 43, figs. 12, a-h. 

 Gooiola!''i.i Xfhroncenm, M and H. (White). lsS3. Eev. Xon Marine Moll. X. 



Am., p. 57, pi. 26, figs. 15 and 16. 



Shell elongated, naiTOwly subovate, length a little moi-e than twice 

 the maximum breadth, spire about one-half the entire length, base 

 imperforate. Volutions six or seven, those of the spire obliquely and 

 very moderately convex or somewhat compressed laterally ; siitiu-e not 

 very distinct ; outer whorl rather strongly convex in the middle, 

 naiTOwing rapidly and unequally below. Aperture subovate, broader 

 than long, angular above and narrowly rounded below ; outer lip thin, 

 simple, and with a shallow sinus above the middle. 



Surface presenting a silky appearance to tlie naked ej-e, but, when 

 examined with a lens, the sculpture is soei: to consist of a mintite and 

 regular decussation caused by very minute and denselj' arranged trans- 

 verse strife, which are crossed by equallj' cnjwded and minute revolv- 

 ing lines. 



Length of one of the most perfect specimens, twentj- millimetres ; 

 maximum breadth of the same, eight millimetres; length of the outer 

 volution, ten. 



