LYMNiEIDyE OF NORTH AMERICA. 433 



Types : Location not ascertained. 



Type Locality: Not ascertained. Probably in Canada. 



Animal, Jaw, Radula and Genitalia: Unknown. 



Range: New York to Michigan, north to Central Ontario. A 

 race of the Great Lakes drainage (Canadian region) characteristic of 

 the Transition and Upper Austral life zones. 



RECORDS. 

 United States. 



Michigan: Saginaw Bay (Miles); Stoney Island, Saginaw Bay, Tuscola 

 Co. (Walker) ; River Rouge, Detroit, Wayne Co. (Miss Walker). 



New York : Rose Hill Cemetery, Buffalo ; Fort Erie Grove, Erie Co. 

 (Miss Walker). 



British America. 



Ontario: Pigeon Lake, Peterborough District (Clapp). 



Geological Distribution : Unknown. 



Ecology : Not recorded. 



Remarks : Ontariensis may be distinguished from canadensis, 

 some forms of which it closely resembles, by its short, very acute spire, 

 the zvhorls of which are very flat-sided, a line drawn from the periph- 

 ery of the body whorl being scarcely interrupted by the convexity of the 

 whorls, as is the case in canadensis. The aperture is also different, 

 being triangularly ovate. It is also a smaller shell. 



In 1862 Kuster (op. cit.) placed in the synonymy of emarginata 

 a shell which he called ontariensis and credited to Muhlfeldt in manu- 

 script. This was said to be ovate-conic with an acuminate spire, con- 

 vex whorls and a semioval aperture. It seems evident from this de- 

 scription that the shell herein recorded, and which was first brought to 

 the attention of the writer by Mr. Bryant Walker, is the form which 

 Muhlfeldt had in mind. In the absence of types or of typical speci- 

 mens for comparison, and as this distinct little form is without a name, 

 it would appear quite proper to use Krister's name. The shells vary 

 somewhat, particularly in the convexity of the whorls, which resemble 

 those of emarginata in some examples. The aperture flares markedly 

 in some specimens. The immature shell has a strong, twisting columel- 

 lar plait, but the adult has the usual wide, flattened inner lip of the 

 emarginata group. This race has been called both emarginata and cat- 

 ascopium and is probably so labelled in many collections. 



Galba contracta Currier. Plate XLVI, figures 1-4. 



Limneea contracta Currier, Kent. Sci. Inst., Mis. Pub., No. 1, 1868. — Sowb., 

 Conch. Icon., XVIII, Lira., pi. 15, fig. 32 b, 1872.— Walker, Journ. Conch., II, 

 p. 330, 1879; Nautilus, VI, p. 33, 1892; Rev. Moll. Mich., p. 18, 1894. 



Limnophysa contracta Currier, Kent. Sci. Inst., Pub. No. 5, p. 14, pi. 1, 

 fig. 1, 1881. 



