REPORT ON THE GASTEROPODA. 503 



tudinal strise are rather stronger, and the spiral system feebler than on the spire. The 

 edge of the base is rounded, but there is a change of direction at that part which produces a 

 very slight angulation. The lip of the small umbilicus is thickened and augulated. Colour 

 glossy on the surface ; the shell is milkily transparent, glassy, and thin. Spire conical, 

 with a very slightly concave profile, long and fine. Apex small, rounded, but with a very 

 slight contraction and prominence on one side, in consequence of the extreme tip being not 

 entirely suppressed. Whorls 12, of gradual and regular increase, convex ; the base is 

 rounded, slightly tumid, and produced. Suture linear, regular, rather sharply though 

 minutely impressed. Mouth small, oval. Outer lip leaves the body a little below the 

 contraction of the base ; from this point it advances forwards so as to form with the body 

 a small but acute-angled sinus ; it sweeps round, not patulous, with a very regular curve 

 to the point of the pillar, which it joins at a bluntly-acute angle, and forms there a slight 

 but not at all incised canal. Pillar is very slightly oblique and a little concave. Inner 

 lip is entirely discontinuous across the body, and first appears in a minute thin abrupt 

 edge, which surrounds the base of the pillar ; its very thin, narrow, aud slightly patulous 

 face forms the entire pillar. Umbilicus lies behind the thin pillar-lip, and is a minute 

 deep funnel-shaped pore, sharply defined by its angulated and thickened basal lip. H. 

 0-42 in. B. (P15. Penultimate whorl, height 0-062. Mouth, height 0-094, breadth 0-064. 



This species is very closely related to Aclis mizon, Wats., and in any classification they will certainly 

 go together. From that species this differs not only in the ribs, which are probably a very variable 

 feature, but, besides, the shell is proportionally broader, the spire is less attenuated, the base is 

 rounder and more tumid, the suture is more linearly impressed and less open, the whorls are more 

 regularly rounded and of more rapid increase, the apex is larger, and the extreme tip is more 

 projecting. 



3. Aclis sarissa, 1 Watson (PI. XXXIV. fig. 3). 



Aclis sarissa, Watson, Prelim. Report, pt. 7, Journ. Linn. Soc. Lond., vol. xv. p. 247. 



Station 122. September 10, 1873. Lat. 9° 5' S., loDg. 34° 50' W. Off Pern ambuco. 

 350 fathoms. Red mud. 



Shell. — Subulate, conical, smooth, white, glossy, with rounded whorls and a somewhat 

 impressed suture. Sculpture : Longitudinals — there are a few very minute and faint lines 

 of growth. Spirals — there are a few irregular and very slight transverse angulations, 

 which are connected with a very subdued and almost invisible malleated surface, which 

 may be seen in a changing light. Colour white, probably transparent in fresh specimens ; 

 the surface, which is glassy, is very smooth. Spire conical, but not quite regularly so, 

 being slightly convex in the middle and very faintly concave above and below. Apex, 



1 Sarissa, a pike. 



