80 THE NAUTILUS. 



RANGE OF LYMNaiA UMBILICATA. 



BY FRANK C. BAKEK. 



This recently recognized and very distinct species has been re- 

 ported from a number of rather widely separated localities. Its 

 range would seem to be from Ontario and Northern Maine west to 

 southeastern Michigan and soutli to New Jersey. It has doubtless 

 been identified as humilis and will be found in many collections 

 under this all embracing name. L. umbilicata is not a race of L, 

 cubensis, as suggested by Mr. Walker, but a distinct species, the 

 radula having tricuspid laterals where those of cubensis Sire bicuspid.' 



The known records are as follows : 



United States. 



Connecticut : Small stream emptying into Farmington River, 

 Unionville, Hartford Co. (Baker). 



Maine: Buckfield, Oxford Co. (J. A. Allen); Woodland, Aroos- 

 took Co. (Nylander) ; Fox Island, Penobscot River, Knox Co. 

 (Jackson). 



Massachusetts : New Bedford, Bristol Co. (Adams); Brook near 

 Caboi's Park, Newton ; Charles River above Watertown, Middle- 

 sex Co. (Baker) ; Swampscott, near Lynn, Essex Co. (Tufts) ; 

 Southl)orough, Worcester Co. (Bos. Soc, N. H.); Salem, Essex Co. 

 (True); Essex Co. (Russell); Westfield, Hampden Co. (Smith. 

 Coll.). 



Michigan: Otter Lake, Lapeer Co. (Walker). 



New Jersey: Drainage ditches east of Burlington, Burlington 

 Co. (Baker ; Pilsbry). 



New York: Maplewood Park, Rochester, Monroe Co.; South end 

 Cayuga Lake, near Itiiaca, Tompkins Co. (Baker); Charlotte Lake, 

 Columbia Co. Lea). 



Rhode Island: The Fountain, Pawtucket, Providence Co. (H. 

 F. Carpenter); Rhode Island (Walker). 



British America. 

 Ontario: Ottawa, Carleton Dist. (Heron); Carleton Co. (Walker). 



' See Mr. Walker's excellent article in Ottawa Nat., XXII, page 89, for the 

 distinguishing characteristics of L. umbilicata. 



