REPORT ON THE GASTEROPODA. 351 



5. Clathurella hormophora ' (Watson), (PI. XXI. fig. 9). 



Pleurotoma (Defrancia) hormophora, Watson, Prelim. Report, pt. 10, Joum. Linn. Soc. Lond., voL xv. 



p. 457. 



Station 23. March 15, 1873. Lat. 18° 24' N., long. 63° 28' W. Off Sombrero 

 Island, West Indies. 450 fathoms. Pteropod ooze. 



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

 of Culebra Island, West Indies. 390 fathoms. Pteropod ooze. 



Station 122. September 10, 1873. Lat. 9° 5' S., long. 34° 50' W. Off Pernambuco. 

 350 fathoms. Red mud. 



Shell. — High and narrow, with no angles anywhere ; porcellanous to ivory-white, a 

 high conical spire, with sharp reticulately sculptured tip ; the whorls are slightly convex, 

 and have a row of beads round the top of each ; the body- whorl aud snout are small, and 

 the base short and contracted. Sculpture : Longitudinals — none but excessively oblique, 

 faint, hair-like lines of growth. Spirals — there is a pretty little row of rounded tubercles 

 close to the suture at the top of the whorls — about 16 in each. The surface is also very 

 finely and superficially microscopically scratched. Colour ivory-white ; but when alive 

 probably porcellanous, glossy. Spire conical, with scarcely any interruption in the profile- 

 lines. Apex consists of 4 conical yellow whorls, rising to a minute tip ; the line of junction 

 between these and the first regular whorl has a deep sinus above and a very prominent 

 forward curve below (see fig.) These whorls are ornamented by a system 

 of minute bars, which for the upper half of the whorl run straight down- 

 wards ; there they split into two and form a very regular reticulation on 

 the lower half of the whorl, each mesh being a square. }V7wrls 1 1 in all, 

 slightly convex, a little high, of very regular increase, each broadening 

 downwards with great regularity, but very slightly, from the upper to the 

 lower suture; the last whorl is a very little tumid, but short and small, " ciathureUa 

 and with a short contracted base. Suture very little impressed, but mop ° 

 rendered definite by the very slight prominence of the edge of the gemmed band below. 

 Mouth oblong, pointed above and below. Outer lip has a very regular and slight curve 

 from end to end ; the edge sweeps very much back at the front of the shell ; in the 

 middle of the mouth it is excessively prominent and is rounded, leaving between its 

 shoulder and the body-whorl a very deep, rounded, and open-mouthed sinus. Inner lip 

 very thinly excavated in the substance of the shell ; it runs very far forward on the bluntly 

 rounded, twisted, and at the point oblique edge of the pillar, which is short and narrow, 

 and at its junction with the body very markedly concave. H. 0'4 in. B. - 14. Pen- 

 ultimate whorl, height 0*08. Mouth, height 0-16, breadth 0*08. 



1 ogjtt&^o'goj, collar-girt. 



