MOLLUSCA. 491 



17. Terebra (Hastula) casta. 



Hinds, Sowerby's Thesaurus, vol. i. pi. 44. fig. 84. 



Terebra hastata (part."), Reeve, Conch. Icon. vol. xii. fig. 81 h. 



"Var. = Terebra albula, Hinds (non Menke), I. c. pi. 45. fig. 126. 



Var. = Terebra incolor, Beshayes, Proc. Zool. Soc. 1859, p. 283. 



Var, = Terebra bipartita, Desh. I. c. p. 284. 



Var. = Terebra mera, Hinds, I. c. pi. 45. fig. 108. 



Cerf Island, Masearenes, 10 fms., sand (Cojapinger) ; Philippines, 

 Lizard Island, Swan Eiver, Seychelles, and Sandwich Islands {Brit. 

 Museum). 



Eeeve is wrong in confusing the West-Indian T. ha'stata with this 

 species. That is a more robust form, with much stouter riblets 

 extending from suture to suture. 



18. Murex (Chicoreus) aAvLatvLS, LamareJc. ' 

 Seychelle Islands, 4-12 fms., sand and coral. 



19. Murex (Ocinebra) pumilus. (Plate XLIV. fig. D.) 



Murex pumilus, A. Adams, Proc. Zool. Soc. 1853, p. 70 ; Sowei-hy, 

 Thesaurus, vol. iv. pi. 400. fig. 200 (enlarged). 



Darros Island, Amirantes, in 22 fms., on a broken-coral bottom ; 

 China Sea {Adams'). 



This charming little species consists of seven whorls, three apical 

 smooth and convex, and four normal. It is of a pink or almost 

 scarlet colour, has six rounded costae on the body-whorl and seven 

 on the upper volutions ; these are crossed by scabrous spiral ridges, 

 of which there are two to three principal ones on the upper whorls, 

 more slender ones intervening between them and the suture, and 

 about seven on the last. The entire surface is beautifully orna- 

 mented by raised lines of growth, so that the transverse ridges are 

 very prettily squamose. The aperture is small, ovate, and contracted 

 anteriorly into a narrow but not closed canal. The labrum is well 

 thickened exteriorly by the last varix, crenulated at the thin margin, 

 and .finely Urate within. Sowerby mentions an orange-coloured 

 variety of this species ; but this is unknown to me. His figure is- 

 very coarsely executed, magnified to more than twice the actual 

 length of the shell, and shows only four costse on the whorls, whilst 

 five are always visible from any point of view. 



20. Murex (Ocinebraj infans. (Plate XLIV. fig. E.) 



Shell small, ovately fusiform, whitish, stained with brown behind 

 the longitudinal ribs. Whorls 7, three apical smooth, convex ; the 

 rest obliquely sloping above, the slightest concavej then sharply 

 angled, straight below the angle and, sloping inwards a little to 

 the suture beneath ; they are strengthened with moderately strong 

 longitudinal costse, crossed by stout spiral ridges and finer lirse. 



