660 THE VOYAGE OF H.M.S. CHALLENGER. 



quickly, but to no great extent. Outer' Up rather thick, almost appressed above, but 

 separated from the body by the sutural canal ; it reaches the top of the shell, but retreats 

 a good deal at this part ; its edge line is curved and it is contracted at the middle, in 

 front the edge retreats and is subemarginate on the base, where it is considerably thickened 

 by the extension of the pillar tooth, which is continued round the front within the edge 

 of the lip, and separated from the edge by a minute furrow. Top : the shell is slightly 

 contracted, and then sharply and flatly truncate ; round the edge and coiling in to the 

 centre is a sharp, expressed keel ; the whole interval between one keel and the next is 

 occupied by the deep, perpendicular-faced sutural canal, the horizontal top of the whorl, 

 and the extracarinal furrow ; the apex is perfectly flat, and is minute and regularly in- 

 coiled. Inner Up: a strongish glassy defined callus runs down the rather cylindrical 

 body, disappears in the extracolumellar furrow, and reappears in the extreme edge of the 

 outer lip ; a strong oblique tooth twists round the base of the pillar, is flattened back on 

 the pillar, and is continued in a small intralabral callus on the base ; behind the pillar 

 edge is a strongish but shallow furrow, but no umbilical chink. H. 0'083 in. B. - 042. 

 Mouth, breadth at same place, 0*009. 



This species is at first sight, and especially in rolled specimens where the sculpture is effaced, 

 deceptively like Vtriculus aratus ; it is really, however, quite different, and in particular the differ- 

 ence may at once be recognised in the top of each. The species seems considerably to resemble 

 Bulla (Tomatina) polita, A. Adams, from Manilla, but the lip is not posteriorly produced. 



19. Utriculus (Tomatina) pachys, 1 Watson (PI. XLIX. fig. 8). 



Utriculus (TornaUna) pachys, Watson, Prelim. Keport, pt. 20, Journ. Linn. Soc. Lond., vol. xvii. 



p. 331. 



Station 169. July 10, 1874. Lat. 37° 34' S., long. 179° 22' E. North-east from 

 New Zealand. 700 fathoms. Blue mud. Bottom temperature 40° F. 



Shell. — Rather large, gibbously oval, being tumid in front and contracted upwards, 

 truncated above, where the edge is carinated and furrowed, with an impressed top and a 

 papillary apex. Sculpture: Longitudinals — the lines of growth are few, sinuous, and 

 very slight. Spirals — round the edge of the impressed top is a rounded keel, with an 

 exterior strongish rounded furrow, outside of which is a narrow sharpish keel ; within the 

 apical pore the whorls are sharply keeled above the channelled suture ; the only other trace 

 of spiral striation is behind the outer lip, where the fresh shell shows some trace of a 

 spiral texture. Colour horny yellowish white. Mouth club-shaped, large, the full length 

 of the shell being a little produced posteriorly, shortly curved across the body, ample in 

 front. Whorls 4, the earher ones only indistinctly visible in the impressed top ; the apex 



1 Ka,%vg, broad. 



