518 THE VOYAGE OF H.M.S. CHALLENGER. 



Tliis species seemed at first sight one already known ; but the impression proved deceptive, and 

 hence the name. The form of the spire is somewhat like Odostomia unidentata, Mont., whilst the 

 mouth resembles Eidima paivensis, Wats, from Madeira. The form of the earlier whorls is faintly 

 suggestive of the peculiar columellar tip of the spire in Stilifer. Eidima lentiginosa, A. Adams, from 

 Japan, is of the same size, but has the whorls rounded, the spire smaller and bent, and the apex 

 much sharper. 



18. Eidima chydcea, 1 Watson (PI. XXXVI. fig. 8). 



Eidima chydcea, Watson, Prelim. Report, pt. 17, Journ. Linn. Soc. Lond., vol. xvii. p. 124, sp. 16. 



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. — Smallish, translucent, strong, rather stumpy, with a short broadish rounded 

 base, a symmetrical spire, a small blnntish rounded tip, subconvex whorls, an impressed 

 suture, an oblique pear-shaped mouth, and a thickened lip. Sculpture : the whole surface 

 is scored with faint regular microscopic longitudinal streaks. Colour translucent white, 

 not very brilliant on the surface. Apex: the first two or three whorls are a little 

 depressed, the tip is flatly rounded, and the extreme tip hardly rises into view. Spire 

 conical, straight, with nearly symmetrical profiles. Whorls 7\, of regular increase, the 

 last alone is a little large ; they are slightly convex ; the base is contracted, tumid, and 

 slightly concave. Suture distinct, being linearly impressed. Mouth short and pear- 

 shaped. Outer lip thickened by an external varix, but with a fine, though blunt edge, 

 which retreats above and is very patulous in front ; in the middle of the solitary specimen 

 it is broken. Inner lip thickened, concave, with a short narrowed pillar, crossed in front 

 by a Eissoina-like furrow. H. 0*15 in. B. 0"06. Penultimate whorl, height - 02. Tip 

 of apex, breadth 0-004. Mouth, height 0-06, breadth 0-05. 



This species slightly resembles Eidima paivensis, Wats., but is narrower, with a finer, more 

 conical spire, flatter-sided whorls, smaller apex and mouth. It has a superficial likeness to Eidima 

 fallax, Wats. ; but has a coarser apex without the two papillary cylindrical first whorls of that species, 

 its spire-profiles are more convex, there is no contraction of the body-whorl, and the mouth is larger. 



The Eulimas of the following group have a coarser apex than those which have 

 gone before : — 



19. Eidima cylindrata, Watson (PI. XXXVII. fig. 1). 



Eidima cylindrata, Watson, Prelim. Report, pt. 17, Journ. Linn. Soc. Lond., vol. xvii. p. 125, sp. 17. 



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

 Island, West Indies. 390 fathoms. Pteropod ooze. 



1 jnjbalos, coarse, such being the general appearance of the shelL 



