247 
mens of A, polypleura compared with the dimensions of the type 
of A. érytopleura is as follows (in decimals of an inch) :— 
polypleura. cyrtopleura. 
Bee fh she 
Greatest diameter . 4 ‘70 
Least diameter ... oe et i 1 “57 
Height of shell ... ae ee Th! tt “Lt 
Height of aperture a Peale) 
Locality.—Bunda Plateau, Great Australian Bight; in great 
abundance as dead shells strewn on the surface, but found living 
buried in the loess-soil at the bases of shrubs. 
Flammulina Pulleinei, spec. nov. PI. vi., figs. la-le. 
Shell umbilicated, depressedly conical, spire slightly elevated ; 
colour reddish-brown. Whorls four, convex at anterior suture, 
thence flatly convex to posterior suture, of moderate increase ; 
last whorl rounded at the periphery, base convex and somewhat 
inflated. 
The ornament consists of very oblique subdistant lamella-like 
corrugations, with intervening close-set coincident lineations 
(about five or six), and transverse microscopic striz in the inter- 
stitial spaces; the corrugations pass across the periphery in 
sigmoid curves to the umbilicus. 
Aperture slightly oblique, roundly-oval; peristome incomplete, 
margins distant and acute; the columella-margin is dilated and 
reflected. Umbilicus of moderate size. 
Major diameter, 4:25; minor diameter, 3°75; height, 2-5; 
diameter of umbilicus, ‘75. 
Two examples taken alive at Carrieton, §.A., by Dr. Robert 
Pulleine. 
This snail has a caudal appendage, and its jaw consists of 
loosely conjoined plates, and thus far agrees with Flammulina. 
I do not know of any described species with which it is necessary 
to make comparison; some forms of /. Fordei present some 
resemblance in ornament, but in other respects that species is 
very different. 
Helicina crassidens, spec. nov. Pl. vi., fig. 6. 
Shell trochiform, somewhat thin, subtranslucent, and sub- 
vitreous. Spire regularly conoid, with a submammillary apex. 
Whorls four and a-half, slightly convex, but perceptibly depressed 
at the posterior suture; last whorl subangulated at the peri- 
phery. The ornament consists of elevated, acute, spiral ridges ; 
five on the body-whorl above the periphery, and about four, more 
slender and closer ones, on the circumferential portion of the 
base. 
Aperture slightly oblique, semilunar; peristome shortly 
expanded and subreflected ; columella short, simple, gradually 
