396 THE CHICAGO ACADEMY OF SCIENCES. 
Types: Chicago Academy of Sciences, four specimens, No. 23800; 
cotpyes, collection Miss Mary Walker, Buffalo, N. Y., Mr. Bryant 
Walker, Detroit, Mich., Academy of Natural Sciences of Philadelphia, 
and the Smithsonian Institution, Washington, D. C. 
Type Locatity: Crystal Brook, Long Island, N. Y. 
ANIMAL, JAW, Raputa and GENITALIA: Unknown. 
Rance: (Figure 43). Long Island. A species of the Alleghanian 
division of the Transition life zone, and of the Nova Scotian region. 
RECORDS. 
Canarsie, King Co. (Ferriss; Weeks); Crystal Brook and Mt. Sinai, Suf- 
folk Co., Long Island, N. Y. (Miss Walker and Bryant Walker). 
GEOLOGICAL RANGE: Unknown. 
Hasitat: In salt or brackish water ‘“‘at low tide in shore of bay 
fed by springs” (Crystal Brook). In ice-cold spring (Mt. Sinai). 
Remarks: This peculiar Lymnza was at first thought to be a 
variety of catascopium but it differs from that species in its thinner 
shell, more globose whorls, especially the spire whorls, and particularly 
by its triangular, smooth, reflected inner lip and distinct umbilical 
chink. The form of the shell and of the inner lip resemble the techella 
group of Lymneas of the subgenus Galba. 
It is probably a variation of the catascopium stock, produced by 
changing conditions of the environment which have dwarfed the shell. 
It is a significant fact that the icy cold spring at Mt. Sinai has pro- 
duced the same shell characteristics as the brackish water of Crystal 
Brook. There is considerable variation in the height of the spire 
among the numerous specimens examined, some individuals having an 
elongated spire a trifle longer than the aperture while in others the 
spire is less than half the length of the aperture. The shell also varies 
in corpulency. The short globose shells are all immature and are the 
specimens first described as typical. Additional specimens from 
Crystal Brook and also from Canarsie show the mature form to have 
a spire as long as the aperture with rounded whorls. A single speci- 
men from Canarsie is distinctly scalariform (plate XLI, figure 6). 
The inner lip is peculiar and, together with the form of the shell, will 
easily separate this species from catascopium, its nearest ally. The 
short spired form was at first thought to be a variation of catascopium 
pinguis, hence the specific name pseudopinguts. 
The shell was first brought to the notice of the writer by Miss 
Mary Walker of Buffalo, New York (who suggested its resemblance 
to bulimoides) and later by Mr. Bryant Walker of Detroit, Michigan. 
