286 REV. R. BOOS WATSON ON THE 



middle of tlie whorls ; the furrows are not stippled. Colour 

 translucent white and gloss}^. Spire conical, scarcely scalar. 

 Apex extremely blunt, being suddenly truncated and flattened ; 

 the extreme tip is very slightly inverted. Whorls 4|, constricted 

 above, flatly rounded in the middle, and very faintly constricted 

 below ; the last is a very little tumid, with a rounded and slightly 

 produced base. Suture strong, slightly oblique, impressed and 

 slightly channelled. Mouth roundly pear-shaped, very bluntly 

 pointed above. Outer lij) : there is a strong shallowish and 

 wide sinus above ; below this the lip-edge (straight in its direc- 

 tion) is prominent, with a very slight emargination on the patu- 

 lous and rounded base-line. Inner lip: an excessively thin and 

 narrow glaze crosses the body, which is scarcely convex ; the line 

 of junction with the pillar and out to the point of the shell is 

 roundly concave : the lip-edge on the pillar is narrow and sharp, 

 and there is behind it a small furrow. H. 0"1. B. 0'05. 

 Penultimate whorl, height 002. Mouth, height O'OS, breadth 0'03. 

 This species is very slightly like A. exilis, Jefl'r., still more A. 

 hovetensis, Seguenza, but is obviously diflerent from both. 



3. Action tueritus, n. sp. 



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

 St. Thomas, N. of Culebra Island, Danish W. Indies. 390 fms. 

 Coral-mud. 



Shell. — Strongish, oblong, pale yellow, translucent, somewhat 

 glossy, with a high conical coarsely tipped spire and rounded 

 striated whorls. Sculpture. Longitudinals — there are many feeble 

 lines of growth. Spirals — the surface of the shell is scored with 

 narrow, shallow, irregular, unequal, distant furrows formed by 

 hardly continuous stipplings which are round on the upper and 

 oblong on the last whorl ; between these furrows there often 

 occurs a weaker one formed in the same way ; on the base they 

 are small and crowded ; toward the upper suture they are strong, 

 the first in particular is so. Colour : the shell itself is trans- 

 lucent white, but is covered with a very thin yellow membrana- 

 ceous epidermis. Spire high, conical, and scalar. Apex very 

 coarse and blunt, slightly immersed, but not inverted. Whorls 

 6, rounded above, cylindrical below; the last is short and slightly 

 tumid. Sioture very little oblique, strong and somewhat chan- 

 nelled. Mouth oval to pear-shaped. Outer lip leaves the body 

 at a right angle ; it is regularly arched throughout, patulous in 



