340 EEV. K. BOOG WATSON ON THE 



the sharp oblique twisted edge of the pillar iu front ; the pillar 

 is short and straight, with a slightly bent-over point. H. 0'4. 

 B. 0-15. Penultimate whorl, height 0*08. Mouth, height 0'13, 

 breadth 0-07: 



The variety subacta has less developed and less regular ribs, is 

 a little longer and smaller, and has a very slightly larger apex. 



This species is closely connected with the group represented on 

 our coasts by C. costulata, Cant., and of which Binney, in his 

 edition of Grould's Moll, of Massachusetts, gives several species. 

 It is, however, very markedly difierent from all of these. 



COLTTMBELLA (PyEENE) STKICTA, n. sp. 



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

 "W. North of Culebra Island, St. Thomas, Danish "West Indies. 

 890 fms. Coral-mud. 



Shell. — Small, short, and dumpy, Avith a rather high, scalar, 

 blunt spire, a short but broadish last whorl, a very contracted 

 base, and a small slightly reverted snout ; the whorls are longi- 

 tudinally chamfred, have a small keel round the top, and rather 

 broad spiral threads. Sculpture. Longitudinals — there are on 

 the last whorl about 12, low ridge-shaped, straight ribs, which 

 are not continuous from whorl to whorl, but increase rapidly in 

 number up the spire ; they are parted by furrows about three 

 times their width ; the last one, which is remote from the edge of 

 the lip, is varicose ; they become obsolete towards the point of the 

 base. Spirals-— below the suture are two well-marked furrows 

 interrupted by the ribs and parted by a strongish thread, which 

 forms a keel, and rises on the ribs into little tubercles ; below 

 this the whorls are more or less obsoletely scored by broad flat 

 threads ; these on the base and pillar are very distinct, though 

 narrow, and are parted by broad, shallow, square-cut furrows. 

 Colour smooth, porcellaneous white. Spire rather high, scalar, 

 conical. Apex a blunt, round, smooth, glossy dome of 1| 

 embryonic whorls, whose tip is both immersed and flattened 

 down, with a scarcely perceptible suture. Whorls 6, cylindrical, 

 scarcely convex, angulated and flatly shouldered at the top ; the 

 last is short, slightly tumid, with a rapidly contracted base, from 

 which projects the short, broad, conical, abruptly truncated snout. 

 Suture angular and well marked by the projection of the shoulder 

 below it. Mouth small, short, but broadish, angulated above, 

 obliquely prolonged below into the square, open, slightly reverted 



