LYMNZIDZ OF NORTH AMERICA. 183 
The species was first found in the greenhouse by Mr. Herbert FE. 
Walter, the instructor in Biology in the Robert A. Waller High School, 
Chicago, in 1901. It was imported on plants from Belgium and has 
thrived well in. captivity, increasing to such an extent as to furnish 
an abundance of material for the biology classes in the above named 
high school. It has also been found in a lily pond in the park, the 
water of which was artificially heated to 90° Fahr. The mantle shows 
conspicuously through the shell in irregular patches of dark and light 
spots. It will probably be found in other greenhouses in the United 
States and there is no reason why it would not thrive in the ponds 
and rivers of certain favorable sections of the country. The Brooklyn 
colony has evidently become well established in the open, and, if the 
environment is favorable, it may become a recognized part of the 
molluscan fauna. 
Genus BULIMNEA Haldeman. 1841. 
1841. Bulimnea HALDEMAN, Mon. Limn., part 3, p. 6, July, 1841. Type Limnea 
megasoma SAY. (Not of H. A. Adams. ) 
1865. Bulimnea Binney, L. and. fo We Si. IN. Amer, Tl, p: 37- 
1870. Bulminea Dati, Ann. Lyc. Nat. Hist., N. es eNpeotee 
1872. Bulimnea TRYON, Con. Hald. Mon., p. 86 (60). 
1876. Bulimnea Meex, U. S. Geol. Sur. Terr., IX, p. 532. 
1880. Bulimnea Cr. & FISCH., Mis. Scient. Mex., II, p. 51. 
1884. Bulimnea TRYON, S. and S. Conch., III, p. 101. 
1905. Bulimnea DALL, Alaska Mollusks, p. 63. 
1908. Bulimnea BAKER, Science, N. S., XX VII, No. 708, p. 943, 1908. 
SyeLtL: Bulimiform, very solid, generally richly colored; spire 
and aperture about equal in length; outer lip simple; axis twisted, 
inclining to gyrate, the fold quite sharp; inner lip expanded and folded 
back, completely closing the umbilicus. (Pl. XVIII, fig. 8.) 
Jaw: With a wide, slightly convex median swelling. (Pl. VI, 
nc. ©.) 
Raputa: - With tricuspid lateral teeth. (PL Vil, ag.) 
GENITALIA: Penis-sac large, the penis one-fourth longer than the 
penis-sac and enlarging gradually to the end, which is club-shaped and 
not rounded, as in the other members of the family ; penis-sac retrac- 
tors one or two in number, penis-sac protractors very numerous ; 
prostate very large, long, irregularly flattened, the posterior portion 
short ; first accessory albuminiparous gland roundly knob-shaped, taper- 
ing toward the vaginal opening ; the oviduct emerges from this gland 
some distance from the termination of the rounded portion. (Pl. X, 
Ag. D.) 
DistripuTion: Nearctic. 
