470 STUDIES ON AUSTRALIAN MOLLUSCA, X., 



This species is related to a small group of spirally ribbed shells 



— R. tenisoni Tate, R. layardi Petterd, R. agntwi Ten. -Woods, 



and R. unilirata Ten. -Woods, among which it stands nearest to 



the last, 



Odostomia ignava, n.sp. 



(Plate x., fig.32.) 



Shell small, narrowly ovate, solid, glossy. Colour white. 

 Nuclear whorls small, half-sunk in the topmost adult whorl. 

 Postnuclear whorls six, regularly increasing, distinctly shouldered 

 above, and rather flattened at the periphery. Last whorl large, 

 rounded on the base. Sculpture: there are no spirals; on the 

 earlier whorls are faint close ribs which gradually disappear on 

 the older whorls. Aperture rather narrow, pinched above, 

 rounded below. Fold scarcely visible. A broad and thick 

 callus spread on the inner lip. Length, 4-85; breadth, 2*3 mm. 



Hab. —Middle Harbour, Sydney (type; self); Trial Bay, N.S.W. 

 (C. F. Laseron). 



The compact shape and feeble fold lend to this shell the aspect 



of a Rissoa. It apparently belongs to the subgenus Heida Dall 



& Bartsch.* 



Eulima topaziaca, n.sp. 



(Plate x., fig.29.) 



Shell small, narrowly ovate, polished, semitransparent, imper- 

 forate. Colour white. Whorls five, rapidly increasing, wound 

 obliquely, contracted at the suture, apex blunt. Sculpture none. 

 The columella and base of each spire-whorl visible through the 

 shell. Aperture pyriform, rounded below, contracted and angled 

 above where it tends to separate from the body-whorl. Lip 

 simple, columella reflected, narrow. Length 2*55 ; breadth, 

 1*25 mm. 



Hab. — Middle Harbour (one specimen collected by the late 

 Mrs. Starkey). 



Type to be presented to the Australian Museum. 



* Proc. Biol. Soc. Washington, xviii. 1904, p. 13. 



