MOLLUSCA OE THE ' CHALLBNaEE ' ErPEDITIOlSr. 333 



8. TJteictjlus spatha, n. sp. 



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

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

 390 frns. Coral-mud. 



Shell. — Large, cylindrically oblong, gradually and slightly 

 narrowing forwards, more abruptly so up the short stumpy and 

 very blunt spire, thick, exquisitely reticulated, with a truncated 

 and toothed pillar and a straight slightly contracted outer lip. 

 Sculpture. Longitudinals — the whole surface is delicately and 

 sharply scored in the lines of growth with very fine rounded 

 furrows parted by sharper and much narrower ridges, which are 

 about j-gW of an inch apart. Spirals — -a little stronger than the 

 longitudinals, which they cut across, are spiral lines very distinct 

 above, one or two on the shoulder being even strong and remote, 

 more delicate and similar to the longitudinals in front, and in 

 the middle very faint indeed, only sufficient to produce a satiny 

 sheen ; round the top of the whorls below the suture is a very 

 broad shallow furrow or slight constriction bordered by a very 

 feeble keel below, which forms a vague shoulder. Colour ivory- 

 white. Mouth f of the whole length of the shell, in shape some- 

 what clavate, being shortly broad in front, elongately conical 

 throughout most of its length, and rapidly contracted at the 

 top. Whorls 2|, rounded above with a very slight concave 

 constriction below the suture, subcylindrical in the middle and 

 rounded in front. Suture linear, impressed, and very sUghtly 

 horizontally margined below. Outer lip contracted and appressed 

 above, so that the top of the mouth runs up to a long and very 

 narrow point, bluntly angulated at the shoulder, below this it is 

 straight, but draws in towards the axis, in front it is patulous 

 and well rounded; the edge line is convex, and retreats very 

 rapidly in front, where the shell is abruptly truncate. Top very 

 bluntly rounded, the apex being to some extent enveloped in the 

 succeeding whorl, which rises slightly above it. Inner lip — a 

 thick pad of glaze, with well-defined edge, extends down the 

 slightly convex body, and passes with gradual sweep into the 

 twisted subconcave pillar, which is truncate in front ; at the 

 base of the pillar the glaze is much thickened, and presents 

 for a short distance two very oblique twisted parallel folds, 

 which are parted by a small furrow ; another furrow lies outside, 



I/IMiT. JOITEN. — ZOOLOGY, VOL. XVII. 24 



