REPORT ON THE GASTEROPODA. 645 



disease. In this species the general form of the shell, and especially I hat of the body-whorl, is even 

 liker a Btdla than is the case with Scaphander puncto-striatus (Migh.) ; but the apex is not perforated. 

 As in that species, one, looking up the pillar, can only see a single complete whorl. The minute 

 stippling of the spirals resembles, on a still smaller scale, that feature in Scaphander lignarius (Linne). 

 Compared to Scaphander mundus, Watson, this is a much more tumid form, and the sculpture is 

 markedly different. 



4. Scaphander gracilis, Watson (PI. XLVIII. fig. 4). 



Scaphander gracilis, Watson, Prelim. Report, pt. 20, Journ. Linn. Soc. Lond., vol. xvii. p. 345. 



Station 73. June 30, 1873. Lat. 38° 30' N., long. 31° 14' W. West of Azores. 

 1000 fathoms. Pteropod ooze. Bottom temperature 39° - 4 F. 



Station 78. July 10, 1873. Lat. 37° 26' N., long. 25° 13' W. Off San Miguel, 

 Azores. 1000 fathoms. Volcanic mud. 



Shell. — Thinnish, oblong, slightly flattened, a little narrowed upward, obliquely trun- 

 cate at the top, where the outer lip rises like a tooth on the right ; in front it is a little 

 oblique toward the right, very little expanded, rounded towards the point. The mouth is 

 pear-shaped and small for the genus. Sculpture : Longitudinals — the lines of growth are 

 very slight. Spirals — the whole surface is dotted over with fine remote stipplings some- 

 what variable in size and shape, running in rather oblique spiral lines, which are a little 

 crowded above and distant in front, where, however, an additional finer line of minute 

 stipplings is often intercalated. Epidermis membranaceous, pale lemon-yellow. Colour 

 dead white, with occasional translucent longitudinal bands. Crown consists of the bluntly 

 rounded edge of a small shallow round pit, which is partly or wholly choked up with the 

 labial callus : the line across the crown is very oblique. Mouth rather small, pear-shaped, 

 and nearly straight. Outer lip slightly thickened and reflected on the crown of the shell, 

 from which it rises upwards and projects forwards like a tooth : from this point it advances 

 almost straight with a patulous and scarcely convex edge to the beginning of the base, 

 whence it sweeps round, retreating and very patulous to the point of the pillar. Inner 

 Up very slightly convex above, almost straight in its oblique course across the base ; on 

 all this part a thickish well-defined glaze is spread on the front of the body ; as the mouth 

 beo-ins to widen, this glaze is pressed out into a blunt angulation, almost a tooth, which is 

 prolonged to the left in the narrow-edged, flat-fronted, truncated, twisted, concave pillar : 

 here the reverted callus, which dies out at the point of the pillar, has behind it a small 

 shallow flat furrow leading up into a pore-shaped umbilicus. Looking up the axis of the 

 shell, though the opening is rather narrow, two whorls can be distinguished. H. 0"62 in. 

 B. 0"34. Greatest breadth of mouth, - 24. 



This is a long and narrow shell with little of the generic peculiarity of shape, though the 

 anterior splay form is recognisable. The singular thickening of the pillar seems to increase with 



