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



and small, convex, keeled by the upper spiral, and slightly so by the lower one also ; they 

 have a long drooping shoulder, narrow slightly from the first to the second spiral, and are 

 contracted to the suture below ; the last is small ; the rise of these short regularly but 

 very slowly increasing whorls, with the long drooping shoulder and the squareness 

 between the two keels, gives a pagoda-like aspect to the shell. Suture scarcely oblique, 

 constricted. Mouth very small, gibbously round, bluntly pointed above, and in front of 

 the pillar, where there is an angulation which represents the canal. Outer lip thin ; 

 from its insertion it runs straight outwards and downwards, then curves round the corner 

 of the base, where it is flat and patulous. Inner lip concave throughout ; it is very thin 

 on the body, and has a thin patulous twisted edge on the short pillar. H. 0-099 in. B. 

 0-038. Mouth, height 0'028 ; breadth 0-021. 



This pretty little shell is slightly like Bittium pcrparvulum, Watson, and might hastily be taken 

 for a variety, but the obvious differences of form and sculpture stand out in stronger prominence the 

 more carefully the shells are examined, and are accented by other points of distinction more difficult 

 of recognition, such, for instance, as the form of the apical whorls. 



20. Bittium furvum, 1 n. sp. (PL XXXVIII. fig. 5). 



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



Shell. — Small, narrow, conical, fine-tipped, dark chestnut, constricted at the suture, 

 feebly tubercled. with three spiral threads on the penultimate whorl. Sculpture: the 

 whole surface of the shell is microscopically striated both spirally and longitudinally, the 

 microscopic spirals being very fine and continuous, the longitudinals coarse and irregular. 

 Longitudinals — there are on each whorl from 12 to 15 strongish longitudinal puckers; 

 these do not appear on the first regular whorl, but on the others are continuous from whorl 

 to whorl ; on the last two whorls two of these puckerings on opposite sides of the shell rise 

 into largish varices. Spirals — in the middle of each whorl are three narrow but strongish 

 prominent rounded threads, which rise into blunt, drawn-out, small tubercles, as they 

 cross the longitudinal puckers ; they are parted by broad shallow furrows ; at the bottom 

 of each whorl, in and almost concealing the suture, is another much more subdued and 

 untubercled but undulated thread, and one still feebler encircles the top of the whorls 

 forming the lower side of the suture ; within the edge of the base is a narrower but equally 

 raised thread ; four flatter ones encompass the pillar, on which, close to its point, still one 

 more appears. Colour: a rich deep chestnut-brown, flecked by the pure white of the 

 varices, and by some irregular pale markings. Spire high, narrow, conical, with faintly 

 convex outlines. Apex "small, but blunt, consisting of three smooth whorls, the first one 

 and a half of which are subtabulated, the second one and a half are subturbinated. Whorls 



1 So called from its colour 



