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. 
1o5a. Limnza catascopium pinguis Say, pl. xxx, fig. 27. 
Limnea pinguis Say, Journ. Phil. Acad., Vol. V, p. 128, 1825. 
Limnea catascopium BAKER (non SAy), Trans. Acad. Sci., St. Louis, 
Vol. XI, p. 4, pl. 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 awhite 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 3 £8) GOs & < 9.505 — *°).6,)0 8s (BABS) 
2: 14.00; “ 9.00; “ s 8.75; “ 5.00 ‘ (8388) 
Animal, jaw, radula and genitaha: 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 area, 
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 pumguis; specimens re- 
ferred to Mr. H. A. Pilsbry were so identified. 
106. Limnza woodruffi Baker, pl. xxxi, fig. 8. . 
Limnea 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 
wer 
