MOLLUSCA OP THE ' CHALLENGES ' EXPEDITION. 433 



canal in front is deep, turning in behind the pillar ; it is nearly as 

 broad as the mouth, and is abruptly cut off in front. Outer lip 

 very slightly convex, a very little inflected, thick, with a very 

 small projecting sharp inner edge and a prominent narrow pinched- 

 in external varix, which extends to the extreme point but not 

 round the snout ; it is half cut through at the very top by the 

 sinus, which, however, does not show itself on the front of the 

 lip ; but at this point the whole lip-edge retreats a little and rises 

 slightly on the body-whorl. Inner lip : there is a minute pad at 

 the top ; but all the rest of it is very thin : in its direction it is a 

 very little oblique ; its edge in front is narrow, rounded, and very 

 slightly twisted. H. 0194. B. 0-087. Penultimate whorl, height 

 0-039. Mouth, height 009, breadth 0'025. 



This species somewhat resembles both P. turgiclula, Forbes, and 

 P. septcmgularis, Mont. ; but is slimmer than either of these, the 

 suture is less impressed, and the ribs are much more regular, 

 more continuous, and less tumid in breadth and prominence ; 

 the spiral sculpture, too, is very much finer, the lines and furrows 

 being much more minute ; the mouth, too, is much smaller and 

 narrower, and has not the convex outer lip. 



34. Pletjeotoma (Mangelia) hypsela, n. sp. (y-^rfkbs, high.) 

 St. 122. September 10, 1873. Lat. 9° 5' S., long. 34° 50' W. 



Off Pernambuco. 350 fms. Mud. 



Shell.— High, narrow, and conical, with very short whorls, of 

 which there are 6 ; the last whorl exceptionally small, with a 

 short conical base and very small snout ; the suture very slight, but 

 extremely oblique ; the apex blunt and rounded ; there are narrow, 

 high, rounded, curved, and very oblique ribs, which run continu- 

 ously from the apex to the point of the base, but not to the snout : 

 there are obsolete spiral stria?, which become stronger on the point 

 of the pillar. H. 019. B. 0-067. Penultimate whorl, height 

 0033. Mouth, height 0-078, breadth 0-033. 



The specimen of this very marked species is in too bad con- 

 dition for more minute description. It is very like P. (Drillia) 

 exilis, Pease, but is much more attenuated, and the last whorl is 

 much shorter. 



35. Pletjeotoma (Majstgelia) acajstthodes, n. sp. 



St. 56. May 29, 1873. Lat. 32° 8' 45" K, long. 64° 59' 35" W. 

 Bermuda. 1075 fms. Grey ooze. Bottom temperature 38°*2. 



