162 Mr. E. A. Smith on Mollusca from the 



Pleurotoma [Surcula) sub corpulent a, Smith. 



Pleurotoma (Surcula) suhcorpulcnta, Smith, Ann. & Mag. Nat. Hist. 

 1894, vol. xiv. p. 161, pi. iii. tig. 6. 



Hab. Station 321, off S. of Ceyhin, 660 fath. 



Two half-grown specimens, differing from the type in 

 having the costte more unmerous and in their rather more 

 slender form. 



Pleurotoma (Surcula) vepallida, Martens. 



Leucosyrinx vepallida, Martens, Deutsch. Tiefsee-Exped. ' Valdivia,' 

 vol. vii. p. 80, pi. ii. fig. 6. 



Huh. Station 281, off Coromandel coast, 300 fath. ; Gulf 

 of Aden, in very deep water [Martens). 



One specimen, agreeing in all respects with the type. 

 Said to have no operculum. 



Pleurotoma (Surcula) Thisbe, sp. n. 



Testa fusiformis, turrita, sordide albida ; anfractus 10?, superiores 

 erosi, cseteri supra concavi, in medio convexiusculi, oblique tenuiter 

 plicati, plicis vel costis inferne atteauatis ad suturam vix pro- 

 ductis, lineis iucreinenli teuuissimis sinuosis sculpti, infra eon- 

 cavitatem, supra et infra costas, transversim tenuiter striati, 

 ultimus antice valde contractus, transversim striatus ; apertura 

 elongata, antice canaliculata ; labrum teuue, ad suturam late et 

 subprofunde sinuatum, in medio arcuatim prominens ; columella 

 curvata, callo tenui lajvi circumscripto induta. 



Lougit. 44 mm., diam. 14 ; apertura cum canali IS longa, in medio 

 6 lata. 



Hab. Station 283, off E. of Ceylon, 1086 fath. 



The chief characteristics of this species, represented by a 

 unique specimen, are the smooth concavity at the upper part 

 of the whorls, exhibiting only very delicate lines of growth 

 and faint traces of spiral stride, the numerous slender oblique 

 costse upon the lower two thirds of each whorl, and the 

 distinct close wavy stria; on and between the ribs. These 

 are nineteen in number upon the penultimate volution, 

 thickest at their upper ends, obliquely curved, attenuated 

 below, and only just reach to the suture. The body-whorl, 

 excepting in the concavity above, is delicately wavy striated 

 throughout. 



Pleurotoma (Surcula) ogalma, sp. n. 



Testa parva, fusiformis, turrita. alba, epidermide tenui grisea induta : 

 anfractus 11 ?, superiores erosi, ca?teri lonte accrescentes, supra ad 



