490 COLLECIIONS PROM THE WESIEHN rKTDIAN OCEAN. 



glossy, convex, non -perpendicular with the axis of the shell ; the 

 rest granosely finely costate and transversely Urate, slightly convex 

 at the sides. Costae about eighteen in number on a whorl, hardly 

 as broad as the interstices. Lirse finer than the ribs, six on the 

 upper whorls and about twenty on the last. Aperture small, nar- 

 row, terminating anteriorly in a short, oblique, recurved canal. 

 Columella covered with a caUus bearing two small tubercles just 

 below the middle. Labrum externally thickened with a broadish 

 varix, faintly sinuated above near the suture, armed within with 

 seven strongish lirse. Length 5 millim., diam. 1| ; aperture 1| long, 

 f broad. 



EtoUe Island, Amirantes, in 13 fms. 



There is a little group of species with which that now described 

 should be placed, and which does not quite come under any one of 

 the as yet named subgenera of Pleurotoma. They are small shells 

 with cancellated sculpture, having smooth apical whorls, an in- 

 distinct labral sinus, and lirse or denticles within the outer lip. 

 Coluikbella monilifera, Sowb. {=Pleurot. fuscolineata, C. B. Adams, 

 =P. scalpta, Eeeve), P. pygmcea, C. B. Ad., P. maculata, C. B. Ad., 

 P. minor, C. B. Ad., P. piperata. Smith, and P'. trifilosa. Smith, all 

 belong to this section. 



The present species is remarkable on account of the proportionally 

 large size of the smooth nucleus, consisting of four and a half 

 volutions. 



13. Terebra babylonica, Lamarck. ^ 

 Marie-Louise Island, Amirantes, 20 fms. 



14. Terebra ceritMna. 



{Lamarck) Kiener, Coq. Viv. pi. 11. fig. 25 ; Sowerby, Thesaurus, vol. i. 



pi. 43. fig. 68 ; Reeve, Conch. Icon. vol. xii. figs. 38 a, h. 

 Var. ? = Terebra eburnea, Hinds, Thesaurus, vol. i. pi. 45. fig. 123. 

 Juv. = Terebra pulchra, Hinds, I. c. fig. 129 ; Meeve, I. c. sp. 155. 



Providence Reef, Mascarenes, 24 fms. 



In the Museum there are specimens from the Seychelles and 

 Philippine Islands, N.E. Australia, Timor, Marquesas and Society 

 Islands. 



15. Terebra dimidiata, juv. 

 Cerf Island, Mascarenes, 10 fms. 



16. Terebra bri^uieri. 



Deshayes, Proc. Zool. Soc. 1869, p. 297 ; Lieeve, Conch. Icon. vol. xii. 



fig. 82. 

 Terebra hindsii, Deshayes, Joum. de Conch, vol. vi. pi. 5. fig. 5. 



He des Eoobes, Amirantes, 13 fms. 



Other localities for this species are China {Deshayes) and Sey- 

 chelle Islands {E. P. Wright, in Brit. Mus.). 



