MOLLUSCA OP THE ' CHALLENGER ' EXPEDITION. 595 



below the pale-chestnut surface. Epidermis very pale chestnut, 

 ttin, somewhat persistent, most delicately hirsute, a minute 

 bristle rising from each of the frettiugs or minute tubercles 

 formed on the spiral threads by the crossing lines of growth . 

 Spire high, narrow, conical. Apex globose, ending in a very 

 small depressed tip ; its 4 whorls are rounded, smooth, but finely 

 scratched with about six distant spiral lines ; they are obtusely 

 but sharply angulated above, and are parted by a narrowly tabu- 

 lated suture. Whorls 8| in all, rounded, contracted above and 

 below, rather obscurely angulated ; the upper whorls are rather 

 high and narrow, the penultimate shortish and broad, the last 

 slightly tumid, with a rounded contracted base, produced into a 

 very lop-sided, longish, narrow, conical, sinistrally bent and 

 reverted snout. Suture impressed, irregular, horizontal between 

 the upper whorls, but between the penultimate and the body- 

 whorl very oblique. Moufh circularly oval, slightly pointed 

 above and also below, where it runs out into the long, nearly 

 closed, sinistrally bent canal. Outer lip semicircular in its curve, 

 projecting thin and sharp in front of the labral varix, patulous 

 except near the body, smooth within, but slightly furrowed by 

 the external spiral sculpture ; it is pinched-in at the top of the 

 canal, down the side of which it runs in a pretty straight line. 

 Inner lip semicircular, patulous, with a few obscure tubercles in 

 front ; it is continuous with the outer lip ; its edge is slightly 

 prominent on the body, markedly so on the pillar, with a furrow 

 behind it, and an umbilical chink at the origin of the canal, 

 where it is bent suddenly and broadly over to the right, so as 

 nearly to cover the canal altogether. Operculum thin, 

 horny, ovate, being rounded at the sides, a little nar- 

 rowed behind and subtruncate in front, where at the 

 outer corner is the nucleus, forming the centre of the 



lines of growth, with which it is rather strongly scored. Operculum 

 ° ' ,1-1 of Nassana 



H. 1-67. B. 0-8. Penultimate whorl, height 0-32. kampyla. 



Mouth, height 1 (exclusive of canal 0*6), breadth 0'45. 



In this species the change of direction in the suture gives the 

 impression of a bend in the axis, and the twisted look of the shell 

 is increased by the distortion of the snout. 



The genus under which to class this form has been selected with 

 much hesitation. Tudicla has the snout sometimes distorted to the 

 left, and has {teste Kobelt) an operculum with a terminal nucleus, 

 but is characterized by a strong tooth on the pillar and a low spire. 



44* 



