63 



Helix Tomsetti, spec. nov. Plate v., figs. 13a— c. 



Shell conoidly depressed, rather thin, widely and deeply uin- 

 bilicated ; spire slightly elevated, widely conical, obtuse ; 

 whorls five, flatly convex, narrowly concavely depressed near the 

 anterior suture, and margined at the suture ; last whorl rounded, 

 rather depressed above, and bluntly angled at the periphery ; 

 posterior to the angulation at the periphery the surface is 

 slightly depressed, thence convex to the suture , base rather 

 abruptly convex ; aperture not descending in front, oblique to 

 the vertical axis, rotundately lunate ; peristome simple, thin, 

 disunited ; columella very slightly reflected over the umbilicus. 



The ornamentation consists of coarse, irregular, oblique 

 striations and distant granulations ; the one and a half apical 

 whorls granulose only ; under surface striated. Colour of the 

 living shell unknown. 



Dimensions. — Major and minor diameters, 14*5 and 12*5 ; 

 height, 7 ; height of aperture, 6 ; diameter of umbilicus, 25 

 millimetres. 



Locality. — Cape Borda, Kangaroo Island, (Tomsetti). This 

 new species is somewhat intermediate between K. Bordaensis 

 and H. Evandaleana, having more the shape of the former, but 

 with the sculpture of the latter ; it is flatter and has a larger 

 umbilicus than H. Evandaleana. 



Mitra pellucida, spec. nov. Plate iv., fig. 13. 



Shell minute, slender, fusiform, translucent, colourless, 

 polished ; apex obtuse ; whorls 6, flatly convex, suture distinct ; 

 the two or three apical whorls smooth, the rest with thick de- 

 pressed axial costa?, the interstices linear and puncturated ; last 

 whorl lirate at the base ; anterior portion of the columella slightly 

 recurved ; columella with three strong oblique plaits ; outer lip 

 not thickened, smooth within. 



Dimensions. — Total length, 7*25 ; of aperture, 3'25 ; breadth 

 of last whorl, two millimetres. 



Localities. — In beach sand, Fowler and Streaky Bays in the 

 Great Australian Bight. 



This new species may perhaps belong to the section Mitroidea, 

 it is certainly not the young of any known Mitridae inhabiting 

 South Australian waters, and I cannot attach it to any figured 

 species of the family. 



Paludina lirata, spec. nov. Plate iv., figs. 6a— b. 



Shell subglobose, thick, imperforate ; spire depressed, conic, 

 obtuse, eroded at the apex ; suture much impressed. Whorls 

 four, convex, somewhat flattened posteriorly. Aperture 

 oblique, large, semicircular ; outer lip attenuated and acute ; 

 interior bluish-white ; epidermis of an olive-green colour ; 



