FAMILY LYMNuEID^E 65 



Genus Erinna Adams. 



Shell small, with a short spire, a large final whorl ; the aperture 

 with a continuous peristome which passes behind a broad somewhat 

 excavated pillar ; axis imperf orate and the pillar not plicate. Type 

 E. newcombi Adams. Hawaiian. 



Incerta sedis. 



Velutinopsis Sandberger. Shell almost planorboid, with few, 

 rounded, rapidly increasing whorls ; the aperture simple, suborbicular, 

 the peristome sharp, simple, not reflected ; the pillar lip broad, not 

 appressed; the axis umbilicate. Type L. velutina Deshayes. Plio- 

 cene of the Crimea. 



Tanousia Bourguignat. Shell small ovate conic, closely and almost 

 involutely coiled ; the last whorl inflated, subcarinate behind, the aper- 

 ture contracted. Type L. zrmanjce Brusina. Pleistocene of Dalmatia. 

 The group was named Sandria by Brusina in 1885,^/2 Westerlund. 



Zagrabica Brusina. Shell ventricose, with a short acute spire and 

 few rounded whorls, rugose, urnbilicate, the last whorl ample, with a 

 rotund transverse aperture, and continuous peristome appressed on the 

 columellar margin ; the outer lip simple. The type is a Pleistocene 

 fossil. A recent form from the Caspian has been referred to this group 

 by Dybowski, under the name of Z. brusiniana. 



I have not seen specimens, but the description reads as if the shell 

 might be a member of the Radix group which has been modified by 

 life in brackish water. 



Lymnaea stagnalis Linnet 



Helix stagnalis LINNE, Syst. Nat., ed. x, p. 774, 1758; ed. XII, p. 1249, 

 1767. 



Lymnaa stagnalis LAMARCK, Prodr., p. 75, 1799. 



Lymnaa jugularis SAY, Art. Conchology, Nicholson's Encyc., I (no pagina- 

 tion), 1817 ; 3d ed. (p. 6), 1819. HALDEMAN, Mon. Limn., p. 16, pi. iv, 

 1841. 



Lymncea appressa SAY, Journ. Acad. Nat. Sci., Phila., II, p. 168, 1818. 

 HALDEMAN, Mon. Limn., p. 18, pi. v, 1842. 



HmncEa stagnalis W. G. BINNEY, Land and Fw. Sh. N. Am., n, p. 25, figs. 

 28-32, 1865. 



Range. Europe, the Caucasus, western and northern Asia, the 

 northern United States, Canada and British America. 



Lake Superior, Lake Winnipeg ! the Saskatchewan River ! Carberry, 

 Manitoba ; Moose Factory, James Bay ! Knee Lake, Keewatin ! Slave 

 River, 25 miles below Peace River ! Great Slave Lake at Fort Rae ! 

 and Fort Resolution ! Fort Simpson ! and Fort Smith ! on the Mac- 



