GG Proceedings of the Royal Society of Victoria. 



dark brown, shining black-brown around the suture, marked 

 with microscopic crowded obliquely transverse lines, and 

 with distant spiral lines. Animal with a large expanded 

 disk-like mantle. 



Dimensions. — Length 5 millimetres ; breadth 8o milli- 

 metres. 



Locality. — Parasitic on Strongylocentrotus, invariably on 

 the periproct in 8 to 10 fathoms, Capel Sound, Port Phillip. 

 J. Bracebridge Wilson. 



This new species resembles in its squat shape S. Turtoni, 

 S. astericola, S. ovoideus, and S. dubia ; but it has not the 

 insinuated outer lip, obtusely-angled posteriorly of those 

 species. In its regular curved outer lip and general shape it 

 agrees with S. Stimjjsoni Verrill, and S. Orhignyanus Hupe ; 

 but the more rapidly enlarging whorls and sub-quadrate last 

 whorl distinguish it from them. 



Umbrella corticalis spec. nov. — 



Shell orbicular in outline, moderately elevated, with the 

 apex ])rominent, somewhat incurved and a little excentric ; 

 covered, except apex, with fi well developed epidermis, which 

 extends about half as far again as the shell. The epidermis 

 is raised into about 20 broad rays, diverging from the apex, 

 and is concentrically lamellose. It is pellucid white, but 

 encircled with a band of maroon colour, corresponding with 

 the edge of the shell ; it is very tough, and can be readily 

 removed in one piece. The shell is of a primrose yellow 

 coloui', thin, concentrically striated, and with a few obscure 

 radial ridges. The animal is of a deep port wine colour ; 

 the foot is circular in outline, with an extended margin ; 

 the under side of the mantle is covered with small white 

 carunculse. 



Dimensions. — Transverse diameters 19 and 1 5 millimetres; 

 height 4 millimetres. 



Locality. — Lower end of the South Channel of Port Phillip, 

 7 to 16 fathoms, sand and weed. J. Bracebridge Wilson. 



Lobiger Wilsoni spec. nov. — 



Animal with the body produced into a very narrow 

 pointed smooth tail, of a green colour, shortly extended 

 beyond the shell. Foot with two oblong rounded and pale 

 tureen lobes, which are somewhat attenuated into a broadish 



