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



deep suture, small body-whorl, short contracted base, and a broad, deeply nicked snout. 

 Sculpture: Longitudinals — on the first regular whorl there are 11 or 12, on the body- 

 whorl about twice as many, narrow, slightly prominent, rounded riblets, which extend 

 from the suture to the point of the base ; they have a sinistral trend, which is very 

 marked on the base ; they are parted by shallow furrows two or three times their breadth ; 

 the lines of growth are fine, sharp, and equal. Spirals — on the penultimate whorl there 

 are about 6, on the body about 12, narrow rounded threads, which rise into sharpish little 

 tubercles in crossing the riblets ; the fourth of these lies about the periphery, and the 

 furrow between it and the third is wider than the others ; in all of these furrows are 

 feebler threadlets. The front of the pillar has a strong twisted swelling. Colour dull 

 brownish yellow, which is a little deeper on the tubercles. Spire high, narrow, conical. 

 Apex slightly abrupt, consisting of 3| turbinated embryonic whorls, of which the extreme 

 tip is very small ; they are smooth and rounded, but slightly keeled above the suture ; 

 towards the first regular whorl the carinating thread becomes double or triple, and a few 

 very oblique riblets appear. Whorls 9|, short, rounded, being pretty equally constricted 

 above and below ; the last is small, being neither broad nor long : the base is short and 

 conical, being drawn out into a broad, lop-sided, slightly reverted snout, in which lies the 

 deep, wide, rounded nick of the anterior canal. Suture very deeply impressed, rather 

 oblique. Mouth semi-oval, obliquely produced in front and abruptly truncated at the 

 point ; it is hardly angulated above. Outer lip has a feeble varix outside, formed by a 

 crowding at that point of the longitudinal riblets ; the edge is sharp, flatly arched, scored 

 internally with long narrow teeth, which are alternately stronger and weaker ; it is slightly 

 emarginated below the suture, prominent in front, and then retreats to the edge of the 

 canal, and here alone it is patulous. Inner lip short across the body, where the labial 

 callus spreads somewhat ; and there in the middle is a strongish little tooth ; the junction 

 of body and pillar is rather concave ; the pillar, which is longish and somewhat swollen, 

 is very obliquely cut off and twisted, with a narrow rounded edge ; two strongish and 

 one or two feeble teeth cross it almost horizontally ; and it runs out in front to a very 

 fine, attenuated, but blunted point. H. 09 in. B. - 35. Penultimate whorl, height 0*16. 

 llouth, height 0-36, breadth 0'17. 



This species is a good deal like Phos borneensis, Sow., from Borneo, but is slightly slimmer ; the 

 first whorls here are larger, the suture is deeper, and between the spirals the shell is smoother. In 

 Sowerby's species, too, the upper angle of the mouth is much more deeply sinuated, and behind this 

 canal is an angulated callus, the pillar is shorter and less sharply pointed, and there is no tooth on 

 the body ; the ribs in that species are stronger and closer set, and are frequently developed into 

 varices, of which, with the exception of the feeble labral swelling, there are none in the Challenger 

 species. 



