208 THE CHICAGO ACADEMY OF SCIENCES. 
on the outer edge of Pujal Lake and under a thorny bush near Valles, 
Mexico (Hinkley). No other records of the ecological relations of 
this species have been seen by the writer. 
RemMArKS: Cubensis is the most common Lymneid in Mexico, 
Cuba and certain of the West Indies. It varies somewhat in corpulency 
and in the height and acuteness of the spire. It is easily known by its 
generally rotund shell, rather short broad spire, large rounded aper- 
ture, rounded, somewhat turban-shaped whorls and by its triangular, 
roundly folded inner lip. This last character will easily separate it from 
umbilicata and aspirans. Truncatula rather closely resembles cubensis, 
but the spire in cubensis is shorter, the whorls are wider and more 
rotund, the aperture is rounder and the inner lip is differently reflected. 
In specimens from Mexico the inner lip may be rolled over into 
the umbilical chink or rolled upward, somewhat as in the race aspirans. 
Cuban specimens average somewhat more obese than specimens from 
Mexico and Florida. 
Both Clessin and Gibbons have called attention to the similarity 
ef certain forms of truncatula to cubensis. This similarity is due, un- 
doubtedly, to parallel development. The life zones of the two species 
are widely separated and there is little fear of confusion in the iden- 
tity of cubensis. Galba humilis has been mixed with cubensis and 
inay be separated by its more elongated and sharper spire, less rounded 
whorls and differently shaped inner lp. 
It is believed by the writer that the references to Lymnea wm- 
bilicata by Adams, from Jamaica, are founded on specimens of cuben- 
sis. See under Galba umbilicata for a discussion of this subject. The 
single specimen of Lea’s lecontit seems referable to cubensis, speci- 
mens from Mexico being almost identical with it in form. 
Galba cubensis aspirans (Pilsbry). Plate XX VII, figures 17-19. 
Lymnea cubensis aspirans Pitspry, Nautilus, XXIII, p. 120, February, 1910. 
Lymnea cubensis Brown, Journ. Conch., X, p. 266, 1903. 
SHELL: Elongate-ovate or fusiform, solid; periostracum light 
yellowish to reddish horn; surface shining, growth lines heavy, con- 
spicuous ; spiral lines absent, or if present, almost indistinguishable ; 
nuclear whorls similar to those of techella; whorls 5% to 6 convex, the 
body whorl ovately ventricose ; spire acutely conical, wide, about equal 
to the aperture in length; sutures well impressed; aperture elongate- 
ovate; outer lip simple; inner lip reflexed to form a flat shelf which is 
narrow and is not compressed at the junction of the columella with 
the parietal wall; parietal callus thin, white ; umbilical chink very large, 
deep, overhung by the inner lip which emargines it; axis as in cubensis. 
