S44 THE VOYAGE OF H.M.S. CHALLENGER. 



Scaphander nobilis, Verrill, is a good deal like, but there the proportion of the body-whorl to the 

 size of the mouth is greater, and the outer lip rises higher and bends more to the lett at the top ot 

 the shell ; the whole shell, too, is narrower. 



3. Scaphander niveus, Watson (PI. XLVIII. fig. 3). 



Scaphander niveus, Watson, Prelim. Report, pt. 20, Journ. Linn. Soc. Lond., vol. xviL p. 343. 



Station 214. February 10, 1875. Lat. 4° 33' N., long. 127° 6' E. South-east of the 

 Philippines. 500 fathoms. Blue mud. Bottom temperature 41° "8. 



Shell. — Thinnish, obliquely oval, slightly narrowed and rouuded above, where the 

 outer lip rises on the right like a tooth ; in front it is rounded with a very blunt angula- 

 tion at the point of the pillar ; ivory-white, glossy, striate, but scarcely stippled. The 

 body is rather tumid, and shaped like a Bulla. Sculpture: Longitudinals — there are 

 exceedingly faint hair-like lines of growth, of which, at frequent intervals, one more 

 distinct produces a slight undulation of the surface. Spirals — the whole shell presents 

 the microscopic and very superficial crimpings of the genus, which become rather strong 

 on the base ; there are also some very superficial and extremely obsolete bandings or 

 furrows and ridges, which are scarcely appreciable. Besides these, the upper half of the 

 shell and the point of the base are scratched with fine square-cut striae, which, with a little 

 difficulty, can be recognised as formed of minute contiguous stipplings : these are very 

 remote in the middle of the shell, but towards either extremity they become crowded. 

 Epidermis membranaceous. Colour white, with a faint ivory tinge. Crown consists only 

 of the flatly rounded margin of a very small pit-like depression in front of the origin of 

 the outer lip, which rises abruptly above the top of the shell. Mouth curved, rather club 

 than pear shaped, being gibbously enlarged in front and elongate and rather narrow 

 behind. Outer lip thickened, reflected, and sinuated above, where, curving forwards, it 

 rises in a tooth-like form above the crown ; from this point it sweeps very equably round 

 to the point of the pillar, the curve being very slightly flattened above, and somewhat 

 full on the base : it is patulous throughout : the very thin edge is nowhere very pro- 

 minent. Inner lip roundly convex on the body, bluntly angulated at the top of the 

 short scarcely curved and barely truncate pillar. A thickish and rather prominent glaze 

 joins the two extremities of the outer lip : near its edge on the upper part of the body 

 this glaze has a few irregular rounded tubercles : on the base, where it is thickened to a 

 pad, these tubercles increase in size and number, while the reverted pillar-lip is harshly 

 covered with them. The pillar-lip is not quite closely appressed, having an overhanging 

 edge and a closed chink behind it. H. 1*15. B. 0'8. Greatest breadth of mouth, 0*56. 



Only one specimen of this species having been found, it is impossible to say whether the 

 roughening of the labial glaze is a specific feature, as in some of the Volutes, or the result of 



