322 HEY. E. BOOG WATSON ON THE 



there minutely perforated ; the tooth in front, too, is stronger, 

 and the spiral sculpture is much finer. 



4. Ctliohna noeontensis, n. sp. 



St. 113 a. Sept. 1, 1873. Lat. 3° 47' S., long. 32° 24' 30" W. 

 Anchorage Fernando de ISToronha. 25 fms. 



Sliell.— ^mdll, oblong, broadest below the middle, narrowing 

 to both ends, but especially upwards, thin, transparent, and 

 glassy, 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. 

 Smlpture. 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 furrows : 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. Otder 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 

 conical 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. 

 L. 0-07. B. 0'04. B. of mouth at same place, O'Ol. 



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 semi- 

 Icevis, Jeff"r., this is much sHmmer 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 B. Tiydatis, L., 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. Ad., is in form very 

 like, but is shorter and broader, and more contracted posteriorly ; 

 and this ' Challenger ' species is not an Atys. Something without 

 colour between G. marmorata, A. Ad., and 0. hizona, A. Ad., 

 VFOuld be very near. 0. luticola, C. B. Ad., is much more cylin- 

 drical. 



