SuTER. — On Neio Zealand Pleurotomidae. 67 



Spirotropis bultoacea, Watson. 



Watson, Journ. Linn. Soc. London, vol. xv., p. 418 

 (1881); "Challenger" Exp. Eep., pt. 42, vol. xv., 

 p. 325, pi. XXV., fig. 9 (1886). 



Shell broadish. conical, sharply keeled, \^\i\\ a shortish 

 contracted base and a short snout, short narrow ribs, and 

 coarse spiral threads, a bulbous apex; strong, porcelaneous. 

 Ribs slightly tubercled at top. The spirals marginating the 

 suture. Spire short. Whorls 6J, short, concavely shouldered. 

 Mouth narrowly oval ; sinus blunt, V-shaped. Operculum 

 oval, with hair-like striae ; apex terminal. 



Lengtli, 127 mm. ; breadth, 58 mm. 



Type in British Museum (Nat. Hist.). 



Hab. In 700 fathoms, off East Cape (Stat. 169, Chall. 

 Exp.). Known from no other locality. 



This species is near b^ircula trailli, Hutton, but the longi- 

 tudinal ribs are less numerous, the canal much shorter, and 

 the colour different. 



Sub-family CLAVATULIN^. 

 Operculum pyriform, with lateral internal nucleus. 



Genus Surcula, H. and A. Adams (1853). 



Shell turriculated, fusiform ; spire long ; lip-sinus in the 

 infrasutural depression above the peripheral carina ; canal 

 long, slightly bent. Operculum with medio-lateral nucleus. 

 Dentition, 1 — — 1. 



Key to Species. 



1. Whorls spirally ribbed or aulcate. 



a. Usually wiih 3 strong spiral ribs . . . . S. albula. 



aa. Whorls shouldered, grooved .. .. S . cheesemani. 



bb. Whorls not shouldeted, sometimes with- 

 out grooves or only a few . . . . S. varians. 



2. Whorls longitudinally ribbed. 



a. Suture not margined .. .. .. S. gypsata. 



b. Suture margined. 



aa. Longitudinal plications very numerous S. nova zelandicB, 



bb. Abjut 15 oblique ribs on the last whorl S. trailLi. 

 cc. About 9 strong tubercles on the last 



whorl . . . . . . . . S. verrucosa. 



Surcula novae-zelandiae, Eeeve. 



Reeve, Conch. Icon. (Plezirotoma), spec. 143 (1843). Hut- 

 ton, Cat. Mar. Moll. N.Z., p. 11 (1873) ; Man. N.Z. 

 Moll., p. 43 (188U). TryoD, Man. Conch. (1), vol. vi., 

 p. 181, pi. xii., figs. 42, 44. P. rosea, Quoy and 

 Gaimard, Voy. AstroL, Zool., vol. ii., p. 524, pi. xxxv., 

 figs. 10, 11 (not of Sowerby). P. quoyi, Deshayes, 



