REPORT ON THE GASTEROPODA. 317 



otherwise scarcely convex. The last is small, contracting from the top of the ribs, slightly 

 constricted on the base, with a largish conical snout, which is slightly bent to the left, 

 and is very unequal-sided ; the point is scarcely reverted. Suture linear, lying in a very 

 slight groove, but strongly defined by the marginal swelling below, and by the contraction 

 of the profile-lines above. Mouth buff and white-coloured within, rather small, pear- 

 shaped, angulated at the upper point, and prolonged into the rather wide and open canal 

 below. Outer lip is very slightly concave above, freely convex in the middle, and straight 

 at the canal. It is hardly patulous ; the line of its edge advances straight at first, 

 then retreats, forming a rather large, shallow, open, rounded sinus, from which it runs 

 out rather slowly into a projecting curve, scarcely retreating till it reaches the end of 

 the canal. It is thin throughout. Liner lip is smoothly excavated in the thickness of 

 the shell and is rather broad ; in its direction it is shortly and slightly concave above, 

 scarcely oblique and quite straight on the pillar, the point of which is obliquely truncated 

 with a sharp twisted edge. H. 1*2 in. B. 0"45. Penultimate whorl, height 0*19. 

 Mouth, height 0*5, breadth 0'21. 



This species belongs to that large and variable group which gather round the Pleurotoma griffithii, 

 Gray, the synonymy and individual species of which alike require revision. When the group obtains 

 this revision, it is very possible that the Challenger species, and not a few others, will be reckoned 

 as mere varieties. In the meantime I cannot unite it to any species I know. It has a much smaller 

 body-whorl than Pleurotoma griffithii, Gray. Compared with Pleurotoma sonata, Gray, the sculpture 

 and the proportion of height to breadth throughout the whorls are very diSerent, the growth is shorter, 

 and the pillar has not the twisted band at the point. It is much smaller than Pleurotoma haderleyi, 

 Lischke, from Japan, is also narrower in proportion, and is differently banded. Than Pleurotoma lan- 

 ceolata, Reeve, which is also a Japanese species, Pleurotoma pyrrha is much stumpier ; it has spirals 

 on the whole surface, not excepting the ribs (a characteristic feature on which v. Martens dwells in 

 his admirable figure and description of Reeve's species in the Conch.|Mitt., vol. i. p. 39, pi. viii. fig. 4) ; 

 it has a much larger and proportionally much shorter mouth. Of course if it prove to be a young 

 shell, some of these differences would be accounted for. 



It has some resemblance to Pleurotoma paretoi, Mayer (Journ. de conch., 1868, p. 110, pi. iii. 

 fig. 2), an Upper Tertiary fossil from Piedmont, but is much thinner, somewhat stumpier, with a 

 smaller apex and more tumid body-whorl. 



48. Pleurotoma (Typhlomangelia) paupera, Watson (PI. XXV. fig. 3). 



Pleurotoma (Drill la) paupera, Watson, Prelim. Report, pt. 8, Journ. Linn. Soc. Lond., vol. xv. p. 411. 



Station 191. September 23, 1874. Lat. 5° 41' S., long. 134° 4' 30" E. Arrou Islands. 

 800 fathoms. Green mud. Bottom temperature 39°'5. 



Shell. — Fusiform, biconical, shortly sometimes feebly ribbed, smoothisb, with a slightly 

 constricted suture, of a yellowish-buff colour. Sculpture: Longitudinals — above the 



