434 REV. B. BOOG WATSON ON THE 



? St. 75. July 2, 1873. Lat. 38° 38' N., long. 28° 28' 30" W. 

 Fayal, Azores. 450-500 fins. Sand. 



Shell. — High and narrow, biconical, ribbed and spiralled, of a 

 frosted-white colour, with subscalar, blunt but small-pointed 

 spire, a small body- whorl and mouth, and rather contracted base. 

 Sculpture. Longitudinals — on the last whorl there are 14, on the 

 penultimate 10, and on the first regular whorl 9 ribs : they arise 

 very feebly at the suture, gain height in the sinus-area, and add 

 on a little breadth below ; they are high, narrow, and rounded ; 

 toward the mouth they are crowded, but in general are parted by 

 rounded furrows of two to three times their width ; they extend 

 to the extreme point of the base, but not to the snout. The 

 whole surface is likewise fretted with minute sharp lines of growth. 

 Spirals — on the embryonic whorls there is one, on the other 

 whorls two, fine spiral threads ; the upper and stronger lies below 

 the sinus-area about one third down the whorl, and forms, with help 

 of an angulation at that point, a rather sharp keel, rising into small 

 sharp tubercles at the intersections of the ribs ; between this keel 

 and the root of the snout there are on the last whorl six weaker 

 threads, which all rise into tubercles as they cross the ribs. On 

 the snout are three or four weaker threads without tubercles : 

 the interstices of these spirals are from twice to four times their 

 width. The whole surface of the shell, except the embryonic 

 whorls, is scored with very fine, sharp, close-set spirals, which, at 

 crossing the lines of growth, are beset with microscopic blunt 

 prickles which give the frosted aspect to the shell. Colour white ; 

 only the tip is smooth. Spire conical, scalar, in consequence of 

 the drooping projecting shoulder at the top of each whorl. Apex 

 consists of 3-|- embryonic whorls, which are conically globose, 

 smooth, keeled, closely roundedly ribbed, with a deepish suture, 

 and rise to a minute point (crushed). Whorls 8-j in all, a little 

 hunchy and disorderly ; they have a long slightly drooping 

 shoulder defined by the keel, below which they are cylindrical, 

 with a slight contraction into the lower suture : the last whorl is 

 small, with a contracting scarcely convex base, prolonged into 

 a small, but distinct, and somewhat cylindrical snout. Suture 

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

 shaped, oblique, triangular above, prolonged into the small canal 

 below. Outer lip flat at the shoulder, angulated at the keel, 

 slightly convex below this ; the edge projects thinly beyond the 

 last longitudinal rib, which serves as a varix : it presents a flat- 



