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



above, with a deeply impressed papillary apex, rounded and slightly tumid in front, 

 harshly striate above and delicately so below. Sculpture : Longitudinals — the lines of 

 growth are very slight, but round the top of the shell is a coronal of folds forming ridges 

 and furrows of about equal strength ; these extend over the top and into the hollow 

 crown. Spirals — round the top, harshly scoring the coronal, are four or five deep, but not 

 broad, sharp-cut furrows, parted by flat surfaces of about twice their breadth ; below these, 

 to a fourth of the length, there are distant furrows so obsolete as to be almost invisible ; 

 below this tlie whole suface is superficially scratched with delicate sharp-cut fretted 

 furrows parted by broadish flat intervals. Colour translucent white. Mouth the 'entire 

 length of the shell, being considerably produced posteriorly, where it is slightly enlarged ; 

 in the middle it is narrow, the two sides being almost perfectly parallel, in front it is 

 elongately oval ; in its entire shape it resembles a spoon. Wliorls 4, but the earlier ones 

 are so deeply sunken, and the hole in the crown (where alone they are visible) is so small, 

 that it is difficult to count them ; the apex is papillary. Suture slight. Outer lip rises 

 straight from the crown, with a slight inclination in towards the centre, is narrowly 

 rounded above, and advances straight for about two-thirds of the shell's length, at which 

 point it is slightly expanded, and then becomes somewhat patulous ; it sweeps rather freely 

 round to join the pillar. Top small, oblique, harshly radiatingly striate and deeply 

 narrowly impressed. Inner lip long and straight, slightly convex in front, oblique and 

 slightly concave on the pillar, which is bluntly toothed in front, and has a very narrow 

 scarce patulous prominent edge with a minute furrow behind it. H. 0*18 in. B. 0*06. 

 Mouth, breadth at same place, 0"019. 



This species, whose thin and famished look suggested the name chosen, belongs to the group of 

 which the Mediterranean Utriculus striatula (Forbes), may be taken as a type, though in that species 

 the features attributed to the subgenus Sao (of Cylichna) are much more strongly developed. ComjJared 

 to this species of the Challenger, Cylichna Jijiensis, E. A. Smith, is broader, not squarely truncate above, 

 and not so plicate round the top of the body. Utriculus phiala, A. Adams, from Japan, is not nearly 

 so long and narrow, and is more cylindrical. Cylichna decussata, A. Adams, which is like in sculp- 

 ture, is shorter, less cylindrical, and the outer lip rises much higher behind. Cylichna pyramidata, 

 A. Adams, which is puckered above, is much less cylindrical and is smooth in the body. 



11. Utriculus simillimus, 1 Watson (PL XLIX. fig. 2). 



Utriculus simillimus, Watson, Prelim. Report, pt. 20, Journ. Linn. Soc. Lond., vol. xvii. p. 340. 



September 7, 1874. Torres Straits, North of Australia. 3 to 11 fathoms. 

 September S, 1874. Flinders Passage, Cape York, North Australia. 7 fathoms. 

 Station 186. September 8, 1874. Lat. 10° 30' S., long. 142° 18' E. Wednesday 

 Island, Cape York, North Australia. 8 fathoms. Coral mud. 



1 So called from its resemblance to the young of Utriculus famelicus, Watson. 



