REPORT ON THE GASTEROPODA. 493 



surface is very faintly, microscopically, and unequally scratched with lines which can only 

 be seen in particular lights. Colour that of dull glass. Spire narrow and conical. 

 Apex : the first whorls are a little|coarse, the earliest regular one is markedly oblique, 

 and is crowned by the embryonic discoidal tip, which is less than half turned over, and 

 consists of two largish whorls. Whorls (exclusive of those of the embryo) 6, slightly 

 convex, rather drawn out, of regular increase : the last is roundedly elongate, with a 

 slightly produced base. Suture oblique, distinct, and open, but very little impressed. 

 Mouth small, narrowly oval, and pointed above and below. Outer lip thin, curved. 

 Inner lip rounded and appressed on the pillar, round the base of which, deep within the 

 mouth, there is a blunt, twisted, but very feeble thickening. H. (P12 in. B. 0"038. 

 Mouth, height 0'033, breadth 0'022. 



This species differs from Odostomia rhabdoid, Wats, (which ifc much resembles), in sculpture, the 

 ribs not being continuous ; in form of whorls, which are more convex and more oblique ; and in the 

 embryonic apex, which, though more drawn out and less tilted over, is like that of Odostomia rufa, 

 Phil., in its discoidal form. 



24. Odostomia (Turbonilla) phrikalea, 1 n. sp. (PI. XXXII. fig. 7). 



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

 Island, West Indies. 390 fathoms. Pteropod ooze. 



Shell. — Thin, narrow, subcylindrical, with an attenuated top, a half-reverted discoidal 

 sinistral tip, flat-sided whorls, a linear suture, a short rounded base, and a small oval 

 mouth. Sculpture: Longitudinals — there are on the later whorls about 25 (on the earlier 

 fewer), narrow, sharply prominent, flexuous, direct riblets, parted by squarish furrows, 

 rather broader than the ribs : they extend to the whole base. Spirals — at the top of each 

 whorl, close to the suture, is a sharpish prominent thread, below which the whorls are 

 slightly and shallowly constricted ; the whole base is marked in the interstices of the riblets 

 with narrow, almost contiguous, flat threads, of which there are traces on the rest of the 

 surface between the riblets. Spire subcylindrical below, above conical, and narrowing to a 

 small point. Apex small, rounded ; it consists of 1^ embryonic whorls, which are discoidal, 

 half turned over, and set on one side of the top. Whorls (exclusive of the embryonic ones) 

 7, flat-sided, longish, especially the last, which has a short rounded base. Suture linear, and 

 not impressed but distinct, being marginated below by a spiral thread. Mouth very small, 

 oval. Outer lip thin, direct. Inner lip thinly continuous and defined across the body, 

 obtuse-angled at the top of the pillar, direct, patulous, and sharp-edged on the pillar, 

 where there is behind the lip-edge a small shallow furrow and minute umbilical depression. 

 H. 0-13 in. B. 0-039. Mouth, height 0037, breadth 0-022. 



1 tytxaX'eog, with a rippled surface. 



