24 
PROCEEDINGS OF THE SCIENTIFIC ASSOCIATION. 
shells having the last whorl receding from the axis of the 
upper whorls. 
Streptaxis deformis Ferussac. 
Helix deformis, Fdr. Mollusques, pi. 32a, f. T. 
fJ Jt Wood } Ind. Test . Supply Helix no. 40.. 
Streptaxis deformis, Philippi, Abbildimgen, ii. 
„ „ Pfeiffer, Set i, 7. 
A small species, colorless or with a slight tinge of pink, 
or yellow. The peristome is thickened, hut without teeth 
there is a lamellar parietal tooth. Height 4 mill, diameter 
6 mill. 
This is not a very abundant shell, but it may bo found 
on the Laventille Hills, especially on limestone ridges. It 
also occurs on the Cotoras and other islands in the Gulf 
of Paria, and in Venezuela and Guiana. 
Simpulopsis Beck 183F.. 
Terrestrial Inoperculata with thin membranaceous Im- 
perforate globose shells having a wide round aperture and 
a simple peristome. 
The genera Streptaxis and Simpulopsis are eminently 
Brazilian as regards their distribution in the western 
hemisphere, to which indeed the latter is peculiar. We 
have no account of any species of Simpulopsis from Guiana ; 
but these shells occur only on trees in the forests, and 
their rarity and delicacy render it possible that they may 
have been overlooked by collectors. 
Simpulopsis corrugat'us Guppy r 
Ann. and Hag. Hat. Hist. 3 ser. vol. xvii, p. 53. 
A greenish-hyaline membranaceous shell corrugated 
by relatively stout ribs and having a small spire and a* 
large body- whorl. . 
Height 10 mill, diameter S' milL 
It occurs in the forest near Savana Grande. 
