MOLLUSCA — II1U)IJ:V 



3or 



VOLVULA TllACiULA, sp. nov. 



(Fig. 110.) 



Station 49. 



Shell small, thin, seniiopaque, oblong-acuniiiiate 

 milk-white. Sculpture : everywhere tinely, 

 spirally grooved ; mediall}' the grooves are 

 almost eti'aced, posteriorly about half-a-dozen 

 are deeply incised. Faint longitudinal 

 growth lines are perceptible. The aperture 

 is as long as the shell, posteriorly it narrows 

 to a canal, anteriorly is broad and eftuse. 

 The inner lip terminates in a spike posteriorly. 

 The columella forms at the base a broad 

 auricular lobe, with a thickened edge. 

 Neither umbilicus nor umbilical furrow are 

 present. Length, 4 ram. ; breadth, 1 65 mm. 



The present is readily distinguished from 

 other Australian VoIvvJce by the sharp point 

 of the posterior end. 



Two shells from 63-75 fathoms off Port 

 Kembla. There is a series in the Australian 

 Museum dredged off Watson's Bay. I obtained 

 it in 1901 in 15 fathoms off South Palm 

 Island, Queensland, which gives the species a 

 decfrees of latitude. 



Colour 



Fig. 110. 

 range of sixteen 



Famify SCAPHANDKIDJE. 



CYLICHNA, Lovcn. 



CYLICHNA THETIDIS, sp. nov. 



(Fig. 111.) 



Stations 28, 49. 



Shell narrow, elongated, cylindrical, thin and glossy. Colour 

 white. Sculpture : growth lines hardly perceptible, encircled 

 by fine, close, incised lines ; almost effaced medially, and wider 

 spaced posteriorly. The crown concave, with a narrow axial 

 perforation, partly roofed by a callus arch. Aperture as long 

 as the shell, narrow above, expanded and effuse below ; lined 



