SuTEK. — On Nezu Zealand Pleurotoinidae. 73 



Mangilia flexicostata, n. sp. Plate 111., figs. 3, 3a. 



Shell minute, oval-elongated, spire longer than the body- 

 whorl, white, semi-transparent. Whorls 5, narrowly shoul- 

 dered, with flexuous plicae, about 16 on the last whorl, 

 microscopically spirally striate. Protoconch 1^ whorls, 

 smooth, minute. Suture deep. Aperture oval, angled above, 

 outer lip somewhat thickened, sinuous, with a broad shallow 

 sinus just below the suture. Columella arcuate, slightly cal- 

 lous ; anterior canal short, rather oblique, truncated. Animal 

 unknown. 



Length, 2-25 mm. ; breadth, 1-25 mm. 



Type in my collection. 



Hab. Foveaux Strait (A. Hamilton). 



Genus Clathurella, Carpenter (1857). 



{^Defrancia, Millet, 1826.) 



Apex mammillary ; sinus varicose, sutural ; columella 

 tuberculated posteriorly, rugose in front ; canal slightly curved. 



Differs principally from Mangilia in its whorls being more 

 rounded and cancellate. 



Key to Species. 



1. With nodulous spiral ribs . . . . . . C. nodicincta, 



2. Spirally striate, locgiDudinal ribs predominant. 



a. Suture margined . . . . . . . . C. subabnormis. 



b. Suture not margined . . . . . . _ C. sinclairi. 



Clathurella sinclairi, E. A. Smith. 



Smith, Ann. Mag. Nat. Hist. (5), vol. xiv., p. 320 (1884). 



Tryon, Man. Conch. (1), vol. vi., p. 283, pi. xxxiv., 



fig. 91 (1884). D. letourneuxiana, Hutton, Cat. Mar. 



Moll, of N.Z., p. 12 (1873), (not of Crosse). D. luteo- 



fasciata, Hutton, Man. N.Z. Moll., p. 45 (1880), (not of 



Eeeve). 



Shell ovate, subturriculated, light-flavescent, with two 



reddish intercostal bands at the sutures ; whorls 8, convex, 



the first ones flattish, with rounded rather low ribs, 16 on the 



last whorl, continuing nearly to the base ; whorls spirally 



more or less distinctly lyrate, the lyrae unequal and continuous 



between and across the ribs. Aperture small, fasciated within 



with fuscous, length j\ of the total length of the shell ; outer 



lip sharp, with a shallow sinus a little below the suture ; snout 



fuscous ; columella with a very small callus ; canal very short, 



oblique. Animal unknown. 



Length, 11 mm. ; breadth, 4-5 mm. 

 Type in the British Museum (Nat. Hist.). 

 Hab. Throughout New Zealand. Chatham Islands. Found 

 also in the Pliocene of New Zealand. 



This is a very variable shell with regard to size and num- 



