264 THE CHICAGO ACADEMY OF SCIENCES. 



to be confined to the Northern and Southern regions, and has 

 thus far been found only in Lake Michigan at Winnetka, Chi- 

 cago and Miller's, Ind. 



1053. Limnaea catascopium pinguis Say, pi. xxx, fig. 27. 



Limna-a pinguis SAY, Journ. Phil. Acad., Vol. V, p. 123, 1825. 

 Limn&a catascopium BAKER (non SAY), Trans. Acad. Sci., St. Louis, 

 Vol. XI, p. 4, pi. i, fig. 9, 1901. 



Shell: Solid, thick, inflated; color light to dark horn; sur- 

 face dull to shining, lines of growth numerous, fine, crowded, 

 crossed by many impressed spiral lines; apex of good size, 

 rounded, dark chocolate colored; whorls five, rounded, much in- 

 flated; spire short, conic; sutures impressed; aperture subovate 

 or roundly ovate, half the length of the entire shell; peristome 

 thin on the edge, thickened within by a white callus; columella 

 reflected so as to cover the umbilicus, and with a rather heavy 

 plait across the middle. 



Length, 13.50; width, 8.75; aperture length, 8.00; width, 5.00 mill. (8388) 

 14.50; " 9.50; " " 9.50; " 5.50 " (8388) 



14.00; " 9.00; " " 8.75; " 5.00 " (8388) 



Animal, jaw \ radula and genitalia: Not examined. 



Distribution: Apparently the same as typical catascopium. 



Habitat: Evidently similar to catascopium. 



Remarks: Variety pinguis may be distinguished from typ- 

 ical catascopium by its shorter spire, more swollen whorls and 

 generally heavier shell. It is not common in the Chicago areai 

 and has been found only in the Calumet River. In a pre- 

 vious paper it was referred to typical catascopium but it is 

 without doubt the short-spired variety -pinguis ; specimens re- 

 ferred to Mr. H. A. Pilsbry were so identified. 



106. Limnaea woodruff! Baker, pi. xxxi, fig. 8. 



Limncea woodruffi BAKER, Bull. Chi. Acad. Sci., Vol. II, No. 4, p. 229, 

 1901. 



Shell: Ventricose, very much inflated, solid; color green- 

 ish-horn or olivaceous; surface shining, growth lines distinct; 

 rough in some specimens, crossed by numerous fine impressed 

 spiral lines; apex small, rounded, light horn colored; whorls 

 three to four, rounded, inflated, the last occupying nearly the 

 whole of the shell; spire depressed; sutures impressed; aperture 

 very large, roundly ovate, occupying about four-fifths of the 

 length of the entire shell, roundly shouldered at the upper part; 

 peristome thin, sharp; columella thickened, spreading, with a 

 plait or fold in the middle; the lower part of the aperture is 



