74 COXTRIBUTIONS TO CANADIAN PAL/EONTOLOGT. 



examples, one of wl.ieh i^ neAvW perfect, :iiid fully an inch and a half 

 in lenu'th. Xorth side of ^lilk Rivej-, five mile, below Pfi-kowdn Coulfie, 

 —and ^outh side of ililk Eiver, one mile alMjve the moLith of Pad-cow-ki 

 Coul(?e and forty feet above the water level, G-. M. Dawson, 18!sl several 

 specimens from each of tho^e localities. 



Dr. C. A. White's figures of this species, which ai-e the only ones yet 

 published, are taken from imperfect specimens, and do not give quite 

 as clear an idea of its charactei':, as Mr. Meek's original descidption doe.s. 

 The -pecimen from the S'lUth vSaskatchewan represented on plate 10, 

 i-- nearly perfect a)id has nine volutions preserved. 



GoxiOBASis SLBTORTUosA, Meek and Hayden. 



Plate 10, fig. 7. 



Mdanni ."ubtortuo^a, INIeek and Hayden. ls.",7. Proc. Ac. Xat. S<:. Phil., vol. IX., 



p. m. 

 Goiiioh'isis ! mbtortiiot'i, Meelc. ls,(.l. Efp. U. S. G'-ol. Surv. Terr., vol- IX., p. .'I'^J, 

 figs. 7.5 and 70 in text and pi. 42 figs. 17, a. h. 

 " White fas of Meek). ISsU. V. .S. Geol. Suu., Contr. to 



Pal., Xos. 1'-^,, p. I>4. 

 " ■■ White (as of Meek). l^sZ. Rev. Xon-Marine Foss. Moll. 



X. Am., p. 07, pi. 1'7, fig. .34. 



.Shell elongate conical, the lengtb being aljout twiiT- a, great a.^, the 

 maximum breadth, the apical portion ratlier -lender ■ volutions --ix or 

 -even, increa-ing somewhat graduallj' in -ize. tlio-e 'ji' the -pire ]i)-o- 

 minent. angulated and bearini;' a -mall but di-tinct spiral keel 

 a little below the mi'ldle of their expo-ed -aidiice-. thi- keel 

 being bordered beneath by a narrow groove which i- well ilefineil on 

 tin; la-t whoid of the -pire but which bc-corni-- le-- ili.^tiuet on the 

 body-whorl : -utui'c deep in con-(.'fj,uence of the proinineni.-e and ariLTU- 

 larity of the volution-. Body-whorl very little le-- than 'nie half the 

 entire length, and a little broader than lonu', anii-alated and di-tinctlv 

 keeled ju-t above the middle, obliquely flattenc(l between thi- -uture 

 and the keel and -trongly convex at the ba-i- ■ axi- imperforate or 

 vei-y nearly -o. Ajici'tui'e rhombic ^ubovate. pointed above and nar- 

 i-owly rounded below. 



Sui'face marked with c|cj~e--el; i-Cii-ularly di-pjo-ed and -ornewhat 

 Hi.-xuou- stiiation- which cj'o-- the whorl- tran-\-er-elv. but with no 

 I'evijlving mai'kings other than the -piral keel, exi.'Cjit one or two very 

 faint and distant lines on the body-whorl near the keel. 



Length of the mo.st jjci-fc-ct -|iecimen colbjcted, eighte-en millimetre.- : 



