312 THE VOYAGE OF H.M.S. CHALLENGER. 



42. Pleurotoma (Crassispira) owenii, Gray. 



Pleurotoma (Genofa) owenii, Gray, MS., Brit. Museum. 



Clavatula striata, Gray, Appendix to King's Australia, p. 485 (teste E. A. Smith). 



(1) Pleurotoma owenii, Reeve, Conch. Icon., vol. i pi. ix. fig. 70. 



Drillia (Crassispira) owenii, Angas, Port Jackson Moll., Proc. Zool. Soc. Lond., 1867, p. 202, No. 99. 



Pleurotoma (Surgula) owenii, Weinkauff, Conch. Cab. (ed. Kiister), p. 98, sp. 117, pi. xxi. fig. 5. 



Surcula owenii, Tryon, Manual, vol. vi. p. 242, pi. vii. fig. 91. 



April 17 and 18, 1874. Port- Jackson, Sydney. 2 to 10 fathoms. 



Habitat. — East coast of Africa (Reeve), Sydney, and Tonga Islands (British 

 Museum). 



Eeeve's figure and description of this species and the locality assigned to it suggest something 

 quite different from the type preserved in the British Museum. 



43. Pleurotoma (Bela) via, 1 Watson (PI. XXII. fig. 1). 



Pleurotoma (Drillia) ula, Watson, Prelim. Report, pt. 9, Journ. Linn. Soc. Lond., vol. xv. p. 420. 



Station 169. July 10, 1874. Lat. 37° 34' S., long. 179° 22' E. North-east from New 

 Zealand. 700 fathoms. Blue mud. Bottom temperature 40°. 



Shell. — Rather short, fusiform, biconical, scalar, angulated, obsoletely ribbed, with 

 rather strong spiral threads. The snout is rather short, broadish, and lop-sided. Sculp- 

 ture: Longitudinals — there are on the last whorl about 18 very oblique, curved, narrow, 

 rather obsolete, irregularly arranged riblets parted by wider shallow furrows ; they origi- 

 nate faintly at the suture, are strongest and somewhat mucronate at the angulation, extend 

 to the lower suture, and appear on the base, but not on the snout ; they are much stronger 

 on the earlier whorls than on the last one. There are very many fine hair-like lines of 

 growth. Spirals — there are a great many remote hair-like threads ; on the shoulder 

 below the suture these are fine and closer-set than on the body and base ; the carinal one 

 at the angulation and that next below this, especially the first, are strong ; they are orna- 

 mented with close-set, round, minute granules, which swell into small prominent tubercles 

 in crossing the riblets ; those on the carinal spiral in particular are high, sharp, and hori- 

 zontally elongated. In the interstices of the ribs and spirals the whole surface is micro- 

 scopically granulated : it is this granulated surface which gives the peculiar crisp aspect 

 to the texture of the shell, from which its name is taken. Colour semi-transparent flinty, 

 white, with a crisp or slightly frosted aspect. Spire scalar, rather stumpily conical, with 

 its profile-lines much interrupted by the constriction of the sutures. Apex : there are 

 two globose embryonic whorls, of which the first is immersed, but scarcely flattened down 

 on one side ; they are rather remotely microscopically regularly striated. Whorls 5^ in 



1 olXoe, crisp. 



