ADMETE. 85 



siderably in its characters ; two forms of it have been described 

 as varieties by Leche. 



Yar. UNDATA, Leche (fig. 27). 



Yar. L^VIOR, Leche (fig. 28 = var. grandis, Morch). 



Yar. ELONGATA, Leche (fig. 25). 



Yar. DISTINCTA, Leche (fig. 26). 



C. ARCTICA, Middendorff. PI. 7, fig. 29. 



Whorls encircled by rounded ribs, the interstices with close 

 zigzag longitudinal striae. Length, 30 mill. 



Bearing" 1 s Strait. 



C. TABULATA, Sowb. PI. 7, fig. 30. 



Whorls narrowly tabulate, granular from decussating ribs; 

 white, under a brownish epidermis ; columella minutely plicate. 

 Length, 22 mill. 



Arctic Ocean. 



C. LIMN.EIFORMIS, E. A. Smith. PI. 7, fig. 31. 



Smooth, thin, diaphanous, whorls 3. Length, 2 '5 mill. 



Kerguelen Island. 



Mr. Smith writes of this species that it has the appearance of 

 a minute Limnsea with the columella truncated a little below the 

 middle. "Although this is a very curious form for an Admete, 

 I am not acquainted with any other genus which it more resem- 

 bles. The character of the truncation of the columella is similar, 

 and the absence of an operculum is also congeneric. From the 

 fewness of the whorls and the thinness of the shell it may be 

 conjectured to be but the young of some larger species. This 

 may be the case, but at present I am unable to identif}^ it as the 

 fry of any genus with which I am acquainted." 



Unfigured Species. 



C. BOREALIS, A. Adams. Melville Island. 



C. AUSTRALIS and C. SCHYTHEI, Philippi. St. of Magellan. 



C. COSTATA, Calcara. Sicily. 



C. OVATA and GLOBULARIS, E. A. Smith. Japan. 



C. UNDATOCOSTATA, Yerkriizen. Arctic Norway. 



C. SPECULARIS and C. CARINATA, Watson. Kerguelen Is. 



