192 
HORN EXPEDITION—MOLLUSCA. 
Syn.— Helix, n.sp., Tate, o/>. cit., vol. iv., p. 140, 1882. 
Sliell depressedly subglobose, spire ratlier sliort. Wliorls five, of rather slow 
increase, flatly convex, separated by a linear suture. Last whorl rapidly descending 
at the front to below the middle line of the penultimate whorl: regularly convex 
except at the anterior one-third, where it is a little narrowed, anterior to which it 
rapidly widens to the wide and shallow post-peristomial constriction ; base rather 
tumidly convex. Aperture oval-elliptic, the major axis oblique, the plane of the 
aperture very oblique; margins horizontally expanded, hardly reflected, thin, 
united all round. Umbilicus nearly one-third the width of the base. 
Colon?' unknown. Sculpture consists of coarse and somewhat interrupted 
arched growth-lines, about four to a millimetre on the penultimate whorl, wider 
than the interspaces; large depressed papilhe are scattered over the surface, which, 
as in A. setigera, doubtlessly supported hair-like prolongations of the epidermis; 
the one-and-a-half embryonic whorls are smooth (possibly the granulation has been 
destroyed, as all the specimens are much bleached). 
Di??iensio?is. —Diameters, 13 (excl. lip) and 11 ; height, 8.5; height of Last 
whorl behind peristomial constriction, 6. 
Locality 1 —Rev. H. Kempe (three bleached examples). 
Affi?iity .—This species differs from other members of the “ Angasella group ” 
by its conoidal shape. 
The species-name has reference to the pimple-like granules on the test. 
Angasella arcigenens, Tate. (Plate XIX., Fig. 27.) 
Reference —Hadra arcigere??s, Tate, Trans. Roy. Soc. S. Aust., vol. xviii., 
p. 193, 1894. 
Shell sublenticular, spire almost flat. Whorls four and a half, of somewhat 
rapid increase, nearly flat, separated by a linear-impressed suture. Last whorl 
abruptly descending at the front, moderately inflated, obtusely keeled posteriorly, 
gradually becoming roundly convex at the front; flatly convex from the periphery 
to the suture, interrupted by a slight concavity adjacent to the peripheiy in the 
posterior part, gradually disappearing towards the front; the medial area shai-ply 
curved, merging into the somewhat tumid base. Aperture oblong-oval, the major 
axis slightly oblique, the plane of the aperture oblique to the vertical axis ; margins 
broadly expanded and reflected, united and reflected all round; the expansion of 
