LYMN^EID^E OF NORTH AMERICA. 351 



not rapidly increasing in diameter, the body whorl very long and much 

 compressed; sutures well marked; spire acutely pyramidal, generally 

 a trifle longer than the aperture ; nuclear whorls like palustris in out- 

 line and number, very dark chestnut colored ; aperture elongated, 

 slightly oblique, rounded below and somewhat acutely angled above, 

 where the outer lip is slightly arched, as it joins the body whorl ; outer 

 lip with a conspicuous varix, bordered by a dark chestnut band; inner 

 lip very narrow, forming a sharp keel on the columella and a thick de- 

 posit of callus on the parietal wall ; there is no evidence of an umbilical 

 chink; the columella is marked by a distinct plait. 



^ength. 



Breadth. 



Aperture ler 



tgth. 



Breadth. 





15.50 



5.50 



7.10 





2.25 



mill. 



Cotype. 



20.00 



6.00 









" 



Gould. 



24.00 



8.00 



11.00 





4.50 



" 



Emmet Co., Mich. 



17.00 



7.50 



9.00 





3.50 



" 



" " 



27.50 



9.25 



10.50 





5.00 





Tomahawk Lake, Wis. 



22.00 



7.60 



10.00 





4.25 



" 



" " " 



Type : New York State Museum, Albany, N. Y., three specimens ; 

 No. A, 3030, cotype, Smithsonian Institution one specimen, No. 9026. 



Type Locality: "Pic Lake," North Shore of Lake Superior. 



Animal : Not differing from palustris. Two colors were observed, 

 one yellow and the other black. 



Jaw : As in reflexa. 



Radula: Formula: ¥ L\+ 3^ + f + j + f + & + ■& (30-1-30); 

 The teeth are similar in form to those of reflexa. 



Genitalia : Similar in form and proportions to those of reflexa. 



Range: (Figure 41). North shore of Lake Superior and eastern 

 Ontario (75°) south to northern Ohio, west to Wisconsin. 



The records show this species to be an inhabitant of the humid 

 division (Alleghanian) of the Upper Austral life zone from whence 

 it extends south into the northern part of the Lower Austral (Caro- 

 linian) life zone and north well into the Boreal (Canadian) life zone. 

 It is characteristic of the Great Lake drainage and of the Canadian 

 and Upper Mississippian regions. 



RECORDS. 

 United States. 

 Michigan: Marquette, Marquette Co. (Downing); Lake Gogebic, On- 

 tonagon Co. (Ruthven) ; Carp Lake, Emmet Co.; Bell Isle, Detroit River, 

 Wayne Co. ; High Island Harbor, Charlevoix Co. ; Charlevoix, Chippewa ; Emmet, 

 Houghton, Marquette, Monroe, Ontonagon, Wayne and Wexford Counties 

 (Walker). 



Ohio: Hudson, Summit Co. (Walker). 

 Wisconsin: Tomahawk Lake, Oneida Co. (Baker). 



