REPORT ON THE GASTEROPODA. 41 



to the slit, which is covered in all its length by the somewhat contracted, sinuous-edged, 

 cross-scored, straight, glassy septum, which arches in to the apex. L. 0"17 in. B. - 13. 

 H. 0-09. 



This species has somewhat the form of Puncturella granulata, Seg., but is not so compressed, and 

 the sculpture is quite different. 



3. Puncturella brychia, 1 Watson (PI. IV. fig. 7). 



Puncturella brychia, Watson, Prelim. Report, pt. 16, Journ. Linn. Soc. Lond., vol. xvii., p. 32, sp. 4. 



Station 47. May 7, 1873. Lat. 41° 14' N., long. 65° 45' W. Off Halifax, Nova 

 Scotia. 1340 fathoms. Blue mud. 



Shell. — Very small, porcellanous, translucent, oval, very slightly broader in front ; its 

 side slopes are slightly, its front slope extremely convex, its back slope is short and 

 flattened, and very much overhung by the protuberant apex ; there are sparse and 

 distinct riblets. The slit is short and coarse, though not large; and from it a broad 

 round ridge trending to the right runs out to the margin. Sculpture : The riblets 

 are neither strong nor sharp ; but they are distinct, rising as little round threads 

 from the flat surface, and being parted by broad intervals, rather strongly pitted 

 by the little specks of the genus; the ridge which runs down the front of the shell 

 is the full breadth of the slit ; the concentric striae are mere slight irregular lines 

 of growth. Colour clouded, porcellanous white under the brownish caducous epidermis. 

 Apex very much curled in and bent down, but not spread out on the backward 

 slope; the minute extreme tip is exserted and projects; the whorls are 2\. Slit: The 

 open part is short and narrowly oblong, and as broad in front as behind, from which 

 point the old scar runs up the crest. Margin thin, patulous, especially behind, crenu- 

 lated by the riblets. Inside porcellanous, deeply hollowed into the apex ; scored 

 by the rib-furrows, of which the one in front is very strong, particularly near the slit, 

 which is rather closely covered by the strong, slightly arched septum, which has a retracted 

 edge and is unbuttressed. L. 0-18 in. B. 0"12. H. 0"1. 



In the animal the eye-peduncles are present ; but no eyes are visible. The pedal 

 papillae are very small, as is also the funnel-shaped process leading to the shell-slit. 



This species in general form is a good deal like Puncturella agger, but is more tumid and higher; 

 the apex and sculpture are very dissimilar. Than Puncturella conica, D'Orb. (Rimula), which is much 

 of the same size, Puncturella brychia has the apex much more turned over ; the form is broader and 

 much more depressed. 



1 /%i%/os, deep sea. 



(ZOOL. CHAIJ,. EXP. — PART XLII. — 1885.) Tt 6 



