HORN EXPEDITION.-MOLLUSCA. 
191 
wlioi’ls minutely granular. Last whorl precipitously and far-descending at the 
front; obtusely angled posteriorly, more regularly convex with the revolution of 
the whorl ; base rather tumidly convex around the umbilicus. Aperture as in 
A. setigera, but the more abrupt descent of the aperture and the deepei' peristomial 
constriction impart a greater deformation to this part of the shell. Umbilicus 
about two and a half the diameter of the base. 
Colour, ornament and sculpture as in P. setigera^ but the rows of bristles are 
more distant. 
Dime7isions .—Diameters, 8 and 7 ; height, 3. 
Locality. —Among rocks shaded by fig-trees about Alice Springs (numerous 
specimens, living and dead). 
AJJitiity .—This species is fairly constant in its characters, which are substan¬ 
tially those of H. setigera, of which it might be regarded as a dwarf state, but the 
flat sh.ape, the more-deflected aperture, aiid fewer rows of bristles rendei’ the 
separation easy. 
The species-name, euzyga, well-yoked, has reference to the complete union of 
the apertural margins. 
Angasella winneckeana, Tate. (Plate XVIII., Fig. 8.) 
Reference— Hadra ivUuieckea^ia, Tate, Trans. Roy. Soc. S. Austr., vol. xviii., 
p. 194, 1894. 
Shell planorbiform, spire flat, whorls three and a half of rather slow increase, 
convex, more abruptly convex at the anterior suture and more gradually sloping 
to the posterior suture, separated by an impressed linear suture ; in all other 
characters the shell is similar to A. euzyga, except in dimensions, in the sparsely- 
developed setfe and the finer and closer sculpture. 
Dimensions .—Diameters, 5 and 4.5; height, 2. 
Locality .—Spencer Gorge, by Brinkley Bluff. 
The species-name is in compliment to Mr. C. Winnecke, the Surveyor to the 
Expedition. 
Angasella papillosa, Tate. (Plate XVIII., Figs. 9.) 
Reference —LLadra papillosa, Tate, Ti-ans. Roy. Soc. S. Aust., vol. xviii., p. 
194, 1894. 
