442 EEV. R. BOOG WATSON ON THE 



the point of the canal, but sharp and a little contracted in all the 

 rest of its extent : it leaves the body at a slightly acute angle, 

 and retreats at once obliquely to the left, but very shortly, to form 

 the narrow rounded sinus, from which, almost parallel to the line 

 of the suture (i. e. with a very slight oblique direction forwards), 

 it sweeps far out to the right in a great convex-edged wing, 

 retreating again a little to the edge of the very short canal, where 

 it turns a very little and obliquely forwards ; the point of the 

 canal is open, and cut off obliquely from the right forwards to the 

 point of the pillar. Inner lip : a thin porcellaneous glaze, a little 

 thickened at the sinus, spreads narrowly on the body, which is 

 a good deal excavated; the pillar is straight, short, conical, very 

 little truncated, with a slightly twisted and sharpish edge, and 

 a pretty solid though fine point at the extreme front of the shell. 

 H. 0-65. B. 0-23. Penultimate whorl, height 01. Mouth, 

 height 0-22, breadth 0*1. 



In style of ornamentation this singularly beautiful species 

 somewhat resembles P. syngenes, Wats. ; but the differences are so 

 obvious as not to need mention. I do not know any species with 

 which to compare it. P. (Fusus) modiolus, Jan, =P. carinata, Biv., 

 has some resemblance ; but that is a coarser and broader shell, and 

 has the mouth much larger. 



41. Pletjrotoma (Eaphitoma) lincta, n. sp. 



St. 24. March 25, 1873. Lat. 18° 38' 30" N„ long. 65° 5' 30" W. 

 Culebra Island, St. Thomas, Dan. W. Indies. 390 fms. Mud. 



Shell. — High, narrow, conical, with a blunt round apex, and a 

 short and very contracted base, ribbed, polished ivory-white. 

 Sculpture. Longitudinals — there are on the last whorl 11, on the 

 first 9, very short ribs (or elongated tubercles) which do not extend 

 to either suture ; they are rounded on the top, are parted by 

 broad rounded furrows, and run obliquely forward from left to 

 right ; they sometimes extend to the base : besides these, there 

 are only slight hair-like lines of growth. Spirals — the prominence 

 of the tubercles forms an angulation at about one third of the 

 whorl's height above the suture ; there are sometimes a few flatly 

 rounded and feeble threads on the snout. The surface is very 

 delicately microscopically scratched. Colour ivory-white and 

 highly polished. Spire high, narrow, conical, with profile-lines 

 slightly interrupted by the projection of the tubercles. Apex 

 consists of 2\ embryonic whorls, which are small, globose, and 



