18 STUDIES ON AUSTRALIAN MOLLUSCA, 



growth, which appear again within the umbilicus. Aperture 

 oblique, ovate; lip very little thickened and expanded. Major 

 diam., 4-9; minor diam., 3-8 ; height, 2*2 mm. 



Hah. — Darnley Island, Torres Straits. One specimen taken 

 by Mr. J. Brazier in 30 fathoms. 



Type. — To be preserved in the Australian Museum. 



This species is not like the typical Liotla ; it possibly belongs 

 to Microtheca, a genus not sufficiently elaborated by its author 

 for satisfactory use. 



LlOTIA DEVEXA, n.Sp. 



(Plate ii., figs. 4-6.) 



Shell turbinate, whorls in transverse section nearly square, 

 widely umbilicate, ver}^ solid, dull. Colour creamy white, 

 whorls four, the upper two nnsculptured, the last descending 

 steeply and suddenly. The whole surface is densely covered by 

 fine, close, radiating threads. Periphery flattened, with a keel 

 at the upper and lower angles, the superior crenulated. Outside 

 the deeply impressed suture runs a row of denticules. Base 

 flattened, the abrupt margin of the aperture scalloped. Aperture 

 semilunate, very oblique, with two massive lips, one within the 

 other. Major diam., 4*5; minor diam., 3*5; height, 3'3 mm. 



Hah. — Torres Straits; dredged by Mr. J. Brazier, in 12 

 fathoms. 



Type. — To be preserved in the Australian Museum. 



Teinostoma vesta, n.sp. 



(Plate ii., figs. 14-16.) 



Shell subdiscoidal, solid, smooth, glossy, white, and widely 

 umbilicate. Whorls four, parted by a furrowed suture, last 

 whorl broadened near the aperture, above ascending on the previous 

 whorl, below with incipient transverse ribs. Spire a little 

 elevated. Umbilicus infundibuliform, sharply angled at the 

 margin. Aperture oval, a little thickened within. Major diam., 

 3-15 ; minor diam., 2-3 ; height, 1-5 mm. 



