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



microscopic furrows, which are a little less obsolete above and below than they are in the 

 middle. Colour a brilliant crimson chestnut, but translucent white all round the mouth. 

 Spire high and narrow, with convex profile-lines. Apex small, roundly and bluntly 

 pointed ; the extreme tip, which is not small relatively, is barely raised ; the first two 

 whorls are covered with rather remote minutely microscopic stipplings, which are arranged 

 in spiral rows. Whods 4| ; the first three are small and conical, the last is long and 

 cylindrical, with hardly convex sides, and no base, except the outer lip, which crosses the 

 end from side to side, and abruptly truncates the shell. Suture barely impressed, and 

 chiefly recognisable from the through-shine of the whorls. Mouth large, gibbously round ; 

 it lies almost transverse to the axis, and is encircled all round by a broadish furrow, which 

 lies between the outer and inner edge of the continuous lip. Outer lip freely curved, 

 very broad, with a thinnish outer and inner edge, between which a rounded furrow is 

 hollowed. Inner lip almost horizontal, crossing the entire front of the body from side to 

 side, so as to leave no pillar at all ; a little curved : a level shelf, broad above and slightly 

 narrowing forward, separates it from the body ; in this shelf is hollowed the circumoral 

 furrow, which widens into a small triangular depression at the insertion of the outer lip. 

 H. 0*044 in. B. 0-017. Mouth, outside, height 0-017, breadth 0-015; inside, height 

 0-011, breadth 0-013. 



This is a very exceptional form. Blssoa glabrata (v. Miihlf.), has, in a less degree, somewhat of 

 the peculiar lip and mouth here present. The double lip, though not quite unknown among the 

 Rissoas, appears here in a most singular and exaggerated form. 



47. Rissoa (Scrobs) badia, n. sp. (PL XLVI. fig. 3). 



April 17-18, 1874. Port Jackson, Sydney. 2 to 10 fathoms. 



Shell. — Small, strong, oval, smooth, lustrous, furvous chestnut, 1 with a broad oblique 

 base, a short spire, few laterally flattened whorls, a blunt rounded tip, and a smallish 

 mouth, thrust out to the right from the body. Sculpture : there are very many slight 

 lines of growth, and fine, rather distant, microscopic spiral furrows, which are least 

 obsolete round the top of the whorls and on the base. Colour a dark translucent dirty 

 chestnut, with a lustrous surface. 2 Spire short, with conical, barely convex profiles. 

 Apex blunt and rounded, the extreme tip being barely raised ; the first whorl and a half 

 are very finely and closely stippled in rather distant microscopic spiral lines. Whorls 4^ ; 

 the first three are broadly conical, with slightly convex outlines ; the last is tumid, with 

 a short, conical, hardly rounded base, from which the mouth is projected out to one side. 

 Suture rather distinctly impressed. Mouth gibbously semicircular, rather small : it lies 



1 Hence the name. 



- In some lights it is iridescent, but that is probably accidental 



