I 



1863.] VANCOUVER ISLAND AND BRITISH COLUMBIA. 69 



9. Ancylus kootaniensis, Baird. 



A. testa ovata, cinerea, concentrice striata, vertice antico, ohtuso ; 

 intus nitida. 



Long. I inch ; lat. | inch. 



Hab. Rivers Kootanie and Spokane, British Columbia. (iti?/s.£n#.) 



The shell is of an ovate form, and is concentrically striated, though 

 the striae only appear on the lower two-thirds of its surface, the apex 

 being smooth and shining. Internally the shell is shining and some- 

 what pearly. 



10. Chione LORD!, Baird. 



Ch. testa minuta, ovato-trigona, nitida, concentrice transversim 

 sulculata, umbonibus prominulis, nitidissimis, lumda nulla, extus 

 lutescente seu albidi-olivacea, intus alba, marginibus tenuissime 

 crenulatis ; sinu pallii brevi, obtusa. 

 Long, nearly | inch ; lat. rather less than 5 inch. 

 Hab. Esquimalt Harbour, Vancouver Island. {Mus. Brit.) 

 This shell was taken in considerable numbers from the crop of a 

 Pin-tail Duck, shot in the Harbour of Esquimalt, Vancouver Island, 

 November 23rd, 18.58. 



It is a small species, of an ovate-triangular shape, a smooth shining 

 appearance, and a light olive colour. The surface is concentrically 

 marked with slight grooves. The beaks are prominent and very 

 shining. Internally the surface is white, the margins of the shell 

 very finely crenulate, and the pallial impression short and blunt. 



11. Sph^rium (Cyclas) tumidum, Baird. 



Sph. testa ovato-trigona, tumida, olivacea, conferte transversim 

 concentrice forte costata ; umbonibus prominentibus, necnon 

 erosis ; interne cceridescente ; margine ventrali rotundato. 



Long. I inch ; lat. rather more than \ inch. 



Hab. Sumass Prairie, Fraser Kiver, British Columbia. (Mns. Bi'it.) 



This shell is of a tumid, swollen figure, and of an ovate-trigonal 

 shape. The colour externally is dark olive, and it is strongly ribbed 

 concentrically. The beaks are prominent, and frequently eroded. 

 The inner surface is of a bluish tint. The ventral or lower margin 

 is rounded. 



12. Sph^rium (Cyclas) spokani, Baird. 



Sph. testa rotundato-ovata, cornea, concentrice transversim con- 

 ferte minute striata, nitida, sub lente obsolete punctata ; um- 

 bonibus rotundatis, obtusis ; ititerne albida ; margine ventrali 

 rotundato. 

 Long, rather less than I inch ; lat. rather more than | inch. 

 Hab. Rivers Spokane and Kootanie, British Columbia. (Mus.Brit.) 

 This shell is smaller than the preceding, more rounded, and with more 

 obtuse beaks. The strioe or riblets are much less distinct ; the colour 

 is pale horny externally, and white internally. It has a shining ap- 

 pearance ; but when examined by the lens, the surface is seen to be 

 indistinctly punctate. The specimens taken from the Spokane River 

 are much larger than those collected in the Kootanie. 



