KEPOKT ON THE GASTEROPODA. 667 



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 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. 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 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 iu its 

 direction. There is a very faint appearance of a tooth on it in front, and behind it is a 

 small furrow and chink. H. 0*07 in. B. 0"04. Mouth, breadth at same place^ - 01. 



This may very possibly be a young shell, but among the BulUdee it is impossible to judge 

 whether a solitary specimen is full-grown or not. Compared with the young of Bulla semilcevis, 

 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 spcciosa, A. Adams, 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 Oylichna marmorata,- A. Adams, and Cylichna hizona, 

 A. Adams, would be very near. Cylichna luticola, C. B. Adams, is much more cylindrical. 



10. Cylichna reticulata, Watson (PL L. fig. 2). 



Cylichna reticulata, Watson, Prelim. Eeport, pt. 19, Journ. Linn. Soc. Lond., vol. xvii. p. 323. 



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

 Island, off Cape York. 8 fathoms. Coral mud. 



Station 187. September 9, 1874. Lat. 10° 36' S., long. 141° 55' E. Near Cape 

 York, North Australia. 6 fathoms. Coral mud. 



Shell. — Small, oblong to subcylindrical, harshly reticulated, white, with a narrow 

 scarcely curved mouth, a lip produced posteriorly, an oblique perforated top, a subpatulous 

 direct and oblique pillar lip reverted on a narrow umbilicus. Sculpture : Longitudinals — 

 the whole surface is scored with strong rounded furrows, which follow the lines of growth 

 and are parted by interstices about once and a half their width. Spirals — similar to the 

 longitudinals, but rather stronger and further apart, are spiral furrows, the intersection of 



