CYLICHNA. 301 



Cylichna krebsii Men., Malak. Bl. xxii, p. 172. Conf. DALL, 

 Blake Gastr., p. 55. 



Smaller than Sulla (ffaminea) curta A. Ad., and aperture very 

 narrow, according to Morch ; but in my opinion it is identical 

 with that species. 



C. NORONYENSIS Watson. PI. 30, figs. 1, 2. 



Shell small, oval, broadest below the middle, narrowing to both 

 ends, but especially upwards, thin transparent, and glossy, rather 

 strongly and remotely striate spirally above and below, the narrow 

 mouth is longer than the body, the top is conically depressed, the 

 straight, slightly oblique, scarcely toothed pillar has behind it a 

 minute furrow and chink. Sculpture: Longitudinals there are 

 fine hair-like lines of growth. Spirals the middle of the shell is 

 smooth ; in front there are about eight strongish remote crimped fur- 

 rows ; these become rather crowded on the base ; above there are 

 about four similar furrows. Colour hyaline white. Mouth long, 

 narrow, curved throughout its whole length. Outer lip rises very 

 slightly above the body, is rounded, with a very slight angulation 

 at the outer corner, from which point to the corner of the base it is 

 a little flatly curved ; on the base the curve is rapid, and the shell 

 is there slightly emarginate. Top is small, oblique, and has a con- 

 ical depression in the middle behind the lip. Inner lip flatly curved 

 on the body ; the pillar is almost quite straight but a little oblique 

 in its direction. There is a very faint appearance of a tooth on it in 

 front, and behind it is a small furrow and chink. Alt. 0*07 in. diam. 

 0'04. Mouth, breadth at same place, O'Ol inch. ( Wats.). 



Off Fernando de Noronka, 7-25 fms. 



C. noronyensis WATS., Chall. Gastr., p. 666, pi. 50, f. 1. 



This may very possibly be a young shell, but among the Bullidse 

 it is impossible to judge whether a solitary specimen is full grown or 

 not. Compared with the young of Bulla semilaevis Seg., this is 

 much slimmer in form, with a longer and smaller body, it is more 

 narrowed and pointed at both ends, and is much more strongly and 

 definitely striate. Compared with the young of Bulla hydatis Linne, 

 besides these same points of distinction, there is the strong curve of 

 the line of the mouth, which in that species is nearly straight. Atys 

 speciosa A. Adams, is in form very like but is shorter and broader, 

 and more contracted posteriorly ; and this Challenger species is not 



