New Species of Victorian Mollusca. 135 



flattening, or even slight concavity, as it ascends to join the 

 suture. The shell is of a white colour, and none of the specimens 

 hitherto examined show any indication of the presence of any 

 other colour markings. 



Dimetisions. — Length, 1 -5 mm. to about 2 mm. ; breadth, 

 •6 mm to '75 mm. ; length of aperture, about -75 mm. 



Locality. — Off Rhyll, Phillip Island, Western Port, obtained 

 from shell sand dredgings, from about 4 fathoms (Gatlitf and 

 Gabriel). 



Observations. — Type in Mr. Gatliff's private collection. This 

 little species in many respects recalls Turbonilla casta, A. 

 Adams, being of a somewhat similar habit ; but the uniformity 

 of its characters and size, exhibited by a fair series of specimens, 

 preclude the possibility of it being a young I'epresentative of that 

 species. 



Tupbonilla brevis, sp. nov. (PI. XXL, Fig. 4.) 



Shell very small and pupiform, consisting of a smooth heteros- 

 trophe embryo of about a whorl and a half with immersed tip, 

 succeeded by four or five whorls very gradually increasing in size. 



Spire whorls flattish to slightly convex, but, as the suture is 

 well and at the same time suddenly impressed, the whorls have a 

 somewhat more convex appearance near the suture. Whorls 

 furnished with numerous fine and close costae, approximately 

 about 16 to 20 toa whorl, fine spiral threads are also present showing 

 in the interstices, giving rise to a clathrate ornament. The above 

 sculpture is not always so well marked on the body whorl ; this 

 feature in some cases appears to be due to deformity in growth, 

 either from fracture and consequent injury, or other interfering 

 causes against the usual regularity of growth. 



Aperture oval, columella straight, outer lip thin, and after 

 ascending descends slightly before joining the penultimate whorl. 



Dimensions. — Length, 2 mm. ; breadth, -75 mm. 



Locality. — Off Rhyll, Phillip Island, Western Port, from shell 

 sand, dredged from about four fathoms (Gatliff and Gabriel). 



Observations. — This well marked and pretty little species 

 appears quite distinct from any described Australian species, but 

 may, perhaps, be compared with Turbonilla scalarina. Brazier, 



