New Species of Victorian MoUusca. 



367 



Rissoina rhyllensis, sp. nov. 

 (PL XXT., Fig. 8). 



Shell simple, attenuate, light brown colour. '\MiorIs, eight, 

 flatly convex, sutures lightly impressed. Apex blunt, consisting 

 of two whorls of lighter colour, which are smooth and shining ; 

 the remainder appear smooth, but are very finely, spirally, 

 striate when seen under lens, the striae being crossed by faint 

 longitudinal costae. 



Aperture oblique, labruni simple, somewhat iiicrassate ; 

 columella with a rather thick callus. 



Dimensions of Type.- -Length, 6.7 ; breadth, 2.3 mm. 



Locality. — Dredged between Phillip and French Islands, Wes- 

 tern Port, about 5 fathoms (type) : San Remo ; Ocean Beach, 

 Point Nepean. 



Obs. — From most member.s of the (xenus, this species must 

 be really distinguished by its smoothness. The colour of 

 specimens is somewhat variable, and in one instance the shell is 

 brown and the whorls have an encircling band of greyish colour 

 ascending to the apex, centrally situated and strongest on body- 

 whorl. This zone of colour covering about one-quarter the width 

 of the penultimate, and in another there are five narrow brown 

 lines on the body-whorl. 



Type in Mr. C. J. Gabriel's collection. 



EXPLANATION OF PLATE XXI. 



Fig. 1. — Daphnella bastowi, n. sp., front view. 



Fig. 2 

 Fig. 3 

 Fig. 4 

 Fig. 5 

 Fig. 

 Fig. 

 Fig. 



— Daphnella bastowi, n. sp., detail of sculpture. 



— Daphnella. bastowi, n. sp., dorsal view. 



— Daphnella bastowi, n. sp., front view, shell tilted. 



— Marginalia victoriae, n. sp. 



— Akera tasmanica, Beddon)e, apex, end on. 



— Akera tasmanica, Beddome, front view. 

 Rissoina rhyllensis, n. sp. 

 Figs. 9, 10. — Phasianella nepeanensis, n. sp. 

 All of the figures variously magnified. 



