98 NILS HJ. ODHNER, MOLLUSCA. 
umbilical furrows. On the whole it seems to be intermediate between M. fulva 
and M. rustica, though differing from both in being of smaller size. 
Hypselostoma australis n. sp. (Pl. 3, figs. 107—109). Shell pyramidal, with 
convex whorls and deep sutures; last whorl dilated, with an angular periphery and 
a protracted aperture. Peristome continuous, expanded all round. Aperture rounded 
heart-shaped, with 5 teeth, 2 on the parietal wall, 2 on the outer wall, and 1 on 
the columella. Sculpture consisting only of oblique fine lines of growth. Umbilicus 
deep, widening below and surrounded by a basal keel. Colour light brownish. Max, 
dimensions: diameter 2.7; height 2, h. of aperture 1.1 mm. 
About 20 empty shells were collected. — The characteristics of the genus are 
given by Tryon (1884, Struct. and Syst. Conch.) as follows: »Shell convolute, conoidal, 
umbilicus open, last whorl free, protracted, turned upwards; aperture trumpet-like 
and dentate; peristome horizontal, expanded.» MorLLENDORFF includes (1891, Proc. 
Zool. Soc. London) 7 species in the genus, and to them are to be added: H. rochebruni 
Mapinte (1887), Tonking, H. roebeleni, pusillum, edentulum MorLLENDORFF (1894), 
Philippines, H. everetti Smiru (1896), Kalao, Isl., H. sibuyanicum, polyodon, quadrasi 
MoELLENDORFF (1896), Philippines, H. fruhstorferi MorLLeNDoRFF (1897), Java, H. 
dohertyi Fuuron (1899), Tenimber Isl., H. hangchowensis PitsBRy (1908), China, and 
H. insularum Pitspry (1910), Japan. The earlier known forms are distributed in 
Further India. The genus is lacking on the Great Sunda Islands, as pointed out by CooKE 
(1894, Cambridge Natural History, Mollusca). The more interesting is the fact that 
one species is now recorded from Queensland, a circumstance which is a further 
proof of the former connection of Australia and New Guinea, the only possible way 
of its invasion. No forms of Hypselostoma are yet known from N. Guinea, it is 
true, but they will certainly become known, either living or fossil, when the fauna 
is better explored (cf. Microphyura microdiscus). 
Aphanoconia extincta n. sp. (PI. 3, figs. 110—112). Shell depressed conical, 
somewhat shiny, with slightly convex base, and littie convex whorls, the last one 
obtusely carinated, slowly descending in front. Sculpture consisting of fine regular 
lines of growth crossed by microscopic oblique rugae, and rather coarse spiral lirae, 
of which 4—6 on the upper side of the last whorl and 3—5 on the penultimate whorl, 
the lirae stretching up to the smooth apical whorl. Aperture oblique, rounded tri- 
angular, peristome thin, hardly expanded, under lip with a tooth-like projection at 
the end of the excavated columella. Basal callus faintly granular, thick and distinctly 
bounded below, thinning and less distinctly limited upwards. Colour grayish white, 
with traces of one subsutural and of one angular white band. Max. dimensions: 
diameter 5.2; height 3; h. of aperture 2; br. of ap. 2 mm; whorls 4 */s. 
The strong spiral sculpture of this shell proves that it belongs to the group 
Sculpta of Aphanoconia (ef. WaGNeR 1911), among which it comes nearest to A. 
kalaoensis 1. A. Smrru, from Kalao Island, and A. submucronata MOLLENDOREF from 
yerman New Guinea. It is of interest that the affinities of the present form are to 
