Lisaospira.] GASTROPODA. 159 



2. Lissospira micra, Tenison-Woods, 1877. Plate 34, fig. 7. 



Cydostrema micra, T.-Woods, P.R.S. Tasm., 1876 (1877), 147. C. (Tubiola) 

 micra, T.-Woods, Man. Conch. (1), x, 95, pi. 33, f. 13. C. micron, 

 T.-Woods : Tate, P.R.S. S.Aust., xxiii, 221. C. micra, T.-Woods : 

 Pritchard and Gatliff, P.R.S. Viet. (n.s.). xiv, 101; Suter, P. Mai. S., 

 viii, 24. 



Shell small, elevated turbinate, white, polished, umbilicated. 

 Sculpture consisting of exceedingly fine microscopical spiral striae, 

 more distinct on the umbilicus. - Colour white. Spire conical, out- 

 lines convex, a little higher than the aperture. Protoconch minute, 

 sphserical, of 1 smooth translucent whorl. Whorls 5, regularly in- 

 creasing, convex, the last rounded at the periphery ; base convex. 

 Suture deep. Aperture circular, slightly angled above. Peristome con- 

 tinuous, sharp, not thickened. Columella arcuate, thin. Umbilicus 

 narrow, deep. Operculum horny, multispiral. 



Diameter, 1-5 mm. ; height, 2 mm. 



Animal unknown. 



Type destroyed by accident. 



Hob. Snares, in 50 fathoms (Captain Bollons). The type is from 

 Tasmania, and it has also been found in South Australia and Vic- 

 toria. 



Genus 2. CIRCULUS, Jeffreys, 1865. 

 Circulus, Jeffreys, Brit. Conchology, iii, 1865. Type : C. Duminyi, Requien. 



Shell small, circular, depressed, not nacreous, of few more or less 

 convex whorls, usually more or less grooved and carinated ; aperture 

 nearly circular, oblique, somewhat angulated below ; peritreme simple, 

 more or less continuous, in the adult modified on the body- whorl into 

 a very thin glaze, which is absent in the young ; umbilicus wide, the 

 reverse of the spire ; operculum thin, light horn-colour, with central 

 nucleus, multispiral (?). (Bush.) 



1. Circulus sub-Tatei, Suter, 1907. Plate 34, fig. 8. 



Cydostrema sub-Tatei, Suter, T.N.Z.I., xxxix, 1906 (1907), 258, pi. 9, f. 6-8. 



Shell minute, subdiscoidal, spirally lirate, broadly umbilicated. 

 Sculpture consisting of broad and shallow spiral grooves, slightly 

 broader on the periphery, leaving between them narrow and sharply 

 raised ridges, 10 on the last whorl. Colour white. Spire very low. 

 Protoconch flatly convex, smooth, formed by 1 whorl. Whorls 3, the 

 last large, flat near the suture, rounded at the periphery, and descend- 

 ing a little in front ; base convex. Suture not much impressed. Aper- 

 ture circular. Peristome continuous, solid. Umbilicus wide and per- 

 spective. 



Diameter Maj., 2-5 mm. ; min., 2 mm. : height, 1-5 mm. 



Dentition unknown. 



Type in the Dominion Museum, Wellington. 



