14 STUDIES ON AUSTRALIAN 3I0LLUSCA, 



<ippearance is suggestive of a continuous rib split into riblets for 

 most of its length but holding together at top and bottom. 

 Aperture very oblique, narrowly ovate, pointed above; peristome 

 double and massive, intruding a broad free lobe into the umbilicus, 

 and clinging to the umbilical edge with a lesser lobe. Umbilicus 

 broad, perspective smooth and excavated within the string of 

 beads which bounds it. Height 1'3, major diam. 1-34, minor 

 diam. 1*2 mm. 



Hah. — Off Darnley Island, Torres Straits, in 10-30 fathoms; 

 one specimen (J. Brazier). 



Type. — To be presented to the Australian Museum. 



This species resembles certain forms of Liutia such as L. devexa^ 

 Hedley, from the same region. The assignment of it to Teino- 

 stoma is governed by the umbilical tongue, a rather artificial 

 character. As I have previously indicated, outlying forms of 

 Liotia so approach some species of Teinostoynri that it is difficult 

 to allot to each its species. 



Liotia corona, n.sp. 



(Plate ii., figs. 21-23.) 



Shell minute, discoid, not nacreous; spire sunken, umbilicus 

 wide and shallow. Whorls three, last half-whorl scarcely in con- 

 tact with the others, suddenly and deeply deflected. Colour 

 white C? bleached). Sculpture: last whorl ringed by 16 thick, 

 projecting, distant ribs which fade above and below at the sutures, 

 these ribs continuing on the suture for about half a whorl. 

 Interstices of the ribs faintly spirally scratched. Aperture very 

 oblique, circular, fortified by a varix. Height 028, major diam- 

 82, minor diam. 0*66 mm. 



Hah. — With Crossea hiconica; four specimens. 



Type. --To be presented to the Australian Museum. 



Liotia incidata, n.sp. 



(Plate ii., figs. 18-20.) 



Shell depressedly globose, rather solid, perforate, flattened on 

 the base. Whorls three, margined at the suture, last slightly 



