Mestayer. — New Species of Mollusca. 131 



distinct, serrated, bordered below by a narrow groove and a nodulous rib. 

 Body- whorl apparently smooth, but in a good light and under a strong 

 pocket-lens very fine hair-like radial lines are to be seen. Upper and 

 under surfaces convex. Aperture circular, with a heavy double varix, bear- 

 ing four deep pits. In the holotyj^e the aperture is closed by a dark-brown 

 raised spiral disc, covered with fine radial threads, which may perhaps be 

 the operculum, though it has somewhat the appearance of a small polyzoan. 

 ZJmhilicus deep, moderately open, revealing all the whorls ; margined by a 

 rather broad radially ribbed groove. Colour light-cream ; the paratype is 

 slightly browner. 



Measurements. — Major diameter, 3 mm. ; minor diameter, 2 mm. ; thick- 

 ness, 1-5 mm. 



Material. — The holotype and one paratype (juvenile). 



Remarks. — Mr. Suter's comment on it was, " Liotia n. sp. distinct from 

 Liotia serrata Suter," the type of which is in his collection. Liotia suteri 

 slightly resembles two species from the Philippines — (1) Liotia discoidea 

 (Reeve),* in its depressed form and peripheral keels, and (2) Liotia cre)iata 

 (Kiener),f in its heavily variced aperture and smooth base. It differs from 

 Liotia crenata (Kiener) in that the whorls only show one peripheral keel 

 above the suture, and from Liotia discoidea (Reeve) in having a smooth 

 base and much more heavily variced aperture. It seems to be a rather 

 rare species, as I have had a considerable amount of material dredged at 

 various stations off the Bounty Islands, and these are the only specimens 

 obtained. Both holotype and paratype are a good deal water-worn, especi- 

 ally the latter, which is not quite perfect. Both specimens are in my 

 collection. 



Family ORBITESTELLIDAE Iredale. 



Orbitestella hinemoa n. sp. (Plate VIII, figs. 7-9.) 



Snares Islands ; 50 fathoms. 



Shell minute, translucent, thin yet strong, discoidal. Whorls 3, sharply 

 angled : periphery vertical with a strong central keel nearly one-third its 

 width. Protoconch minute, one whorl. Spire only very slightly raised on 

 the convex surface. Base concave. Sculpture, one strong peripheral keel, 

 and faint traces of a raised spiral thread near the suture ; many fine raised 

 radials extend from the suture into the widely open umbilicus. Aperture 

 quadrate. Outer lip thin, sharp, wavy. Colour white. 



Measurements. — Holotype : Diameter, 1 mm. ; thickness, ^ mm. 



Material. — The holotype and forty-one paratypes from the type locality. 

 The holotype is in the Dominion Museum. 



Remarks. — There is a good deal of variation in the distinctness of the 

 sculpture ; on the holotype the radial threads are indistinct, but they are 

 very distinct on a paratype, which is placed with it on that account. The 

 species owes its specific name to the ship from which the dredging was 

 taken. Mr. Hedley says it is allied to Orhitestella hastowi (Gatlifl"), the type 

 of this genus ; unfortunately, 1 have been unable to see either the figures 

 or description of Gatliff's species, so am unal^le to say how it differs from 

 0. hinemoa. The sculpture is so fine that though the figures (7-9) show it 

 quite correctly, yet a moderately high power on the microscope is required 

 to bring it out. 



* Man. Conch. (1) x, p. 109, pi. 36, fig. 3. 



t Man. Conch. (I) x, p. Ill, pi. 36, figs. 12, 13. 



5* 



