56 On some New Marine MoUusca, 



BiROSTRA M^COYi, n.s. B. t, parva, Iwvi, nitente, anguste 

 ovata, utrimque attenuata, superne suhacuta, pallide ru- 

 fescente, lahio alhida pallide lutea, conspicue incrassato^ 

 'postice dilatato, canali hrevi, tenuiter curvato. Long. 23, 

 Lat. 7 mil. Hab. Waterhouse, N.E. Tasmania. 



Shell small, smooth, shining, narrowly ovate, alternate at 

 each end, subacute above, pale reddish ; lips whitish and 

 pale yellow, conspicuously thickened, dilate posteriorly, 

 canal short and slightly curved. 



The only species of this rare genus found hitherto in 

 South Australian waters. The type specimen in the Na- 

 tional Museum is unique. 



Olivella Australis, n.s., 0. t, turrita, fusiformi, spira 

 elata apertur. cequanti, IcEvi, nitente, alba, pallide fulva 

 reticulata et fasciis trihus alhis zonata ; sutura vix 

 impressa; apertura angusta, antice dilatata, lahro tenui 

 acuto, columella simplici. Long. 16, Lat. 4| rail. Clark's 

 Island. 



Shell turreted, fusiform, spire produced and equalling the 

 aperture ; smooth, shining, white, reticulated with fulvous 

 brown, and zoned with three white bands ; suture scarcely 

 impressed; aperture narrow, anteriorly dilated; outer lip thin 

 acute, columella simple. 



Differs from 0. nympha in being coloured, and from 0. 

 pardalis and 0. leucozona in its pale reticulated chesnut 

 markings and three white zones. Its shape is also peculiar. 

 I do not think enough is known about the genus to say 

 whether it is liable to variation or not^ and whether the 

 species named are all only varieties. They are all rare, and 

 therefore, one would imagine, less liable to vary. 



Mangelia Harrisoni, n.s. M. t, anguste fusiformi, 

 utrimque attenuata, Imvi, gracili, tenui, translucida, spira 

 elata, acuta, apert. cequanti, lactea, hasi castanea, apice vero 

 fulvo tincto, pallidAssime (ult. anfr. tant.) luteo 4 zonata ; 

 anfr. 8, declivis, oblique costatis, costis Icevibus, rotundatis, 

 parum elevatis, superne obtuse angulatis, antice obsoletis ; 

 sutura bene impressa; apertura angusta, oblonga, labro 

 tenui, labio reflexo. Long. 14, Lat. 4. Clark's Island. 



Shell narrowly fusiform, attenuate at both ends; smooth, 

 graceful, thin, translucent; spire prominent, acute, equalling 

 the aperture, milky white ; base chesnut, but the apex 

 stained, fulvous, and on the last whorl zoned with four bands 

 of very pale yellow ; whorls eight, sloping, obliquely ribbed; 



