321 
pinkish-white, with exterior colouration faintly showing 
through. 
Long.—42 mill. 
Lat.—36__,, 
Alt.—15__,, 
Habitat.—North- West Coast. 
Though very distinct from the other Tasmanian forms, 
this species shows an approach to the common P. asperrimus 
Lam, but may be at once recognised by its form, smaller size, 
and very different colouration. It appears to be of rare 
occurrence, for, although I have seen numerous valves, but 
two perfect examples have come under my notice. It is 
probably a deep water form. 
2. DIAPHANNA NIVEA, 0. sp. 
Shell, globose, very thin, semi-transparent, milky-white, 
shining; whorls, 4; spire, small, scarcely projecting, 
longitudinally streaked with fine lines of growth; aperture, 
narrowly ovate, inflated. 
Long.—14 mill. 
Lat.—7 ,, 
Habitat.—Near River Leven (Miss Lodder). An unique 
example of a new genus to our Marine Molluscan fauna. 
3. CASSIS TUMIDA, 0. sp. 
Shell, thick, white, dull, globose, marked with a few 
prominent lines of growth; whorls, 5; rounded, minutely, 
regularly, transversely lirate; spire, small, short, rather 
acute, apical whorls, smooth, suture emarginate; callus 
deposit, thin, striate, and shining; aperture ovate, inflated ; 
outer lip, sub-reflexed, and slightly prominently thickened 
cutside. 
Long.—30 mill. 
Lat.—18__,, 
Habitat.--Near River Leven (Miss Lodder). A single 
specimen collected of this small but distinct specie. 
