UGA ae Ag Wy ag Me iP, 
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THE NATURAL HISTORY SURVEY. 409 
black, irregular spots which show through the shell; foot 
roundly elongated, 18 by 11 mill., head broad, auriculated; ten- 
tacles large, flat, long, triangular; heart pulsations slow and 
regular; thirty-four per minute. The animal is slow and de- 
liberate in its movements. 
Jaw and radula: Not examined. 
Genitalia: Not examined. 
Distribution: European; greenhouseand lily-pond in Lin- 
coln Park, Chicago. 
Geological distribution: Pleistocene. 
Habitat: Similar to that of the larger Limnzas. 
Remarks: Some time ago Mr. Herbert E. Walter, In- 
structor in biology in the North Division High School, Chi- 
cago, brought to the writer several specimens of a Limnza 
which was new to the fauna of the United States. Upon 
inquiry the locality was given as the propagating greenhouse 
in Lincoln Park. Several days later Miss Marie La Grange, a 
pupil in the North Division High School, found a number of 
the same species in a lily pond in the Park, the water of which . 
was artificially heated to give the necessary warmth for certain 
tropical plants, the temperature being above 90° Fahr. 
Comparison with the shells in the Academy’s collection 
showed the species to be Limmea auricularia, and an inquiry of 
the park gardener brought to light the fact that certain plants 
had been recently imported from Belgium. This information 
at once removed the mystery surrounding the sudden appear- 
ance of this shell in the Park, and shows how easy it is at the 
present time to transport a species from one continent to an- 
other, especially if it be a pulmonate. Theshells of auricularia 
are about an inch in length, of a deep corneous color, and are 
rather thin. When alive, the mantle of the animal is seen 
through the shell to be made up of dark and light spots ar- 
ranged irregularly. The animal appeared rather active, mov- 
ing about the aquarium with a steady, gliding motion. 
163. Amnicola walkeri Pilsbry. 
Amnicola walkert PILSBRY, The Nautilus, Vol. XII, p. 438, 1898. 
Shell: “Thin, narrowly umbilicate, conic, shaped like Lyo- 
gyrus browni Carpenter; slightly yellowish corneous; thin, 
smooth, with faint growth-lines. Whorls four, very convex, sep- 
arated by deeply constricting sutures, the last whorl rounded 
below; apex obtuse. Aperture oblique, rather small, mainly 
