102 



DESCRIPTIONS OF NEW MOLLUSCA, 



The peculiar feature of the shell is that each whorl is separated 

 from that within it by a thick layer of intercalated callus which 

 arches higher than the vertex of the whorl, and at the finish 

 projects as a knob beyond and beside the aperture. Beneath, 

 the same callus spreads as a pad over the basal axis ; so that 

 could the callus be dissolved awa}' the whorls would be seen 

 separate. Aperture oblique, simple, oval; above lip sharp, and 

 straight; basal lip thick, bevelled-edged. Diam. major 2, minor 

 1|, height 1 mm. 



H a b. — Panie, New Caledonia. 



Type to be presented to the Australian Museum. 



I collected five specimens among shell-sand at high water 

 mark, two of which differ from the type specimen by the spire 

 being raised instead of sunk. 



The development of the callus is not always so marked as in 

 the individual figured. From Thursday Island, Torres Straits, 

 I have seen what seems a variation of this species in. which the 

 sutural callus is hardlj' visible. 



T. oppletum appears to be a link between Teinstoma proper 

 and Leucorhynclda. 



DiPLOMMATINA OBESA, n.Sp. 



(Fig. 10.) 



Shell minute, sinistral, ovate, stout, narrowly perforate, with 

 dentate aperture, thin, translucid. Colour pale corneous. Whorls 

 six, apex blunt, the first three whorls smooth, 

 the latter three much inflated, drawn in deeply 

 at the sutures, ribbed, the antepenultimate 

 whorl the broadest, the final contracted and 

 greatly descending. Sculptured by slender, for- 

 wardly bent lamellae, which curve across the 

 whorls in a flattened S; of these the last whorl 

 has thirteen and the one above about thirty- 

 three ; the interstices are microscopically, 

 evenly, closely, spirally grooved. Aperture per- 

 pendicular, almost in the median line, greatly expanded, not 



