REPOET ON THE GASTEEOPODA. 205 



Shell. — Small, thin, porcellanous white, feebly ribbed and faintly spiralled, with 

 high spire, blunt apex, rounded whorls, a short contracted base, and a small snout. 

 Sculpture: There are on the penultimate whorl over 20 rounded, oblique, and rather 

 straight riblets, parted by similar, rounded furrows ; these are obsolete on the last 

 whorl, and are much fewer in number higher up the spire : the lines of growth are 

 very fine. Spirals — the surface is covered with very faint, rounded, close-set threads. 

 Colour porcellanous white, with a dead surface. Spire high, conical, subscalar. Apex 

 blunt, rounded, mamillary, with an immersed tip ; it consists of two smooth, globose, 

 embryonic whorls. Whorls 5^ ; they are suddenly contracted above into the suture, 

 below this they are convexly cylindrical, with a very slight contraction at the bottom ; 

 the last is a very little tumid, with a rounded conical base produced into a very short, 

 lop-sided, emarginate snout. Suture rather deep and sharp. Mouth oval, hardly 

 angulated above, and produced below into the short, oblique, open canal. Outer lip well 

 arched ; there is a feeble sinus near the suture, and a slight prominence in front. Inner 

 lip concave above, straight on the pillar, the point of which is twisted and obliquely 

 truncate ; it is defined by a thin narrow glaze. H. 0'25 in. B. O'll. Penultimate whorl, 

 height 0-06. Mouth, height 0'12, breadth 0-05. 



The half-grown shells of Columbdla (Pyrenc) holbolli, Moller, which often present feeble riblets, 

 have some faint resemblance to this species, but these have a much sharper apex and a less 

 impressed suture. 



21. Fusus (Siphonorbis) amblyterus, n. sp. (PI. XVII. fig. 8). 



Station II. January 13, 1873. Lat. 38° 10' K, long. 9° 14' W. Off Setubal, 

 Portugal. 470 fathoms. Green mud. 



Shell. — Thin, unribbed, unequally spiralled, fusiform, narrow, body whorl (probably) 

 small, a subscalar spire, a blunt rounded apex, whose tip is minute and impressed. 

 Sculpture : The whole surface is densely scored with prominent hair-like curved lines of 

 growth ; these are least crowded at the top of the spire, where they radiate out from the 

 apex like fine riblets. Spirals — the whole surface is scored with somewhat remote threads, 

 each of which tends along its crest to split into two ; two of these form a double carina- 

 tion at the periphery, which lies a little below the middle of each whorl ; the shallow 

 rounded furrows which part all these threads are 4 or 5 times their width, and have often 

 a minute thread in the bottom. Colour ruddyish cream. Spire high, subscalarly conical 

 Apex smallish, blunt, and rounded, with a minute immersed tip ; the first 2 whorls are 

 almost discoidal. Whorls 8, but at least one more has been broken off; they are bicari- 

 nated, steeply shouldered, cylindrical between the keels, and contracted below. Suture 

 linear, in a broad open depression. Mouth club-shaped. Pillar twisted. H. 1*24 in. 

 B. 0-57. Mouth, length 0-65, breadth 0"3. 



