MOLLTJSCA OF THE ' CHALLENGER ' EXPEDITION. 427 



the sinus-area, and is occupied by the dislocated tops of the ribs ; 

 these become on the upper whorls more and more a slightly pro- 

 minent tubercled string-course below the suture ; this band is 

 cut off by a slight furrow from the true top of the ribs, which 

 project here a little angularly. The whole surface is closely 

 beset with spiral threads and furrows ; of these threads that at 

 the suture is broadish but depressed ; below it is another stronger. 

 On the body and base are about ten accompanied by one or some- 

 times two very small ones. The furrows are broadish, square, and 

 flat in the bottom ; on the snout are three or four ; and on the 

 twisted cord in front there are five. Colour :* a narrow band 

 above the suture and the sinus-area below are of a deep rich buff, 

 which extends to the whole base, intensifying to a rich ruddy 

 orange on the snout and pillar; the ribs are white, but except 

 on the snout their interstices are dark pur ply brown. Spire 

 very regularly conical and high. Apex consists of about 2~ very 

 small, conically tapering, embryonic whorls, parted by a very fine 

 suture, and rising to a minute rounded tip, which is very much 

 bent down on one side. Whorls 13 in all, conical, barely convex, 

 and hardly angulated near the top ; they are short and broad, 

 of very regular slow increase ; the last is small, and contracts 

 quickly but not deeply, with a rounded base prolonged to a 

 broad conical snout which is obliquely cut off in front with 

 a twist, which forms a sort of slight cord across the point. 

 Suture slightly impressed, distinct. Mouth small, narrow, pear- 

 shaped, rather sharply pointed above, with a longish, curved 

 rather narrow, and open canal in front, which runs down the 

 massive snout, and is patulous, till at the very point the edge is 

 slightly inverted. Outer lip broken : the sinus lies about JU of 

 an inch below the suture, from which it is separated by a strong 

 shelf of that breadth and about -^j inch long ; it is deep, rounded 

 and narrow, being shut in by the high shoulder into which the 

 outer lip projects below it ; orange-coloured, through which the 

 dark bars shine. Inner lip : there is a small but thick and nar- 

 row pad above ; below, it is reverted on the pillar, and has a 

 raised edge ; in front it is not bent back again, but runs down 

 to the point with a prominent sharp edge : the pillar is rather 

 short, strong, not broad, conical, sharp-pointed, not twisted, and 

 not cut off obliquely, as usual, from the right of the shell 

 towards the left, but, on the contrary, from the left to the right; 

 and here the projection of the lip-edge leaves a small, shallow 



