M0LLTJ3CA OF THE ' CIIALLTi;N-&ER ' EXPEDITION. 333 



and higli behind ; compared to this part the head, mantle, and body 

 are small; the snout is largish and subeylindrical, above it the great 

 velum extends widely, aud is collected into a subcorneal protu- 

 berance at the corners, from which rise the rounded conical ten- 

 tacles ; no trace of eyes exists. Above the head is the mantle, ex- 

 panded on the left into the rather short, stumpy, and proboscis-like 

 siphon, which is open below. The reproductive organs, possibly 

 to some extent everted at death, appear like a large tumour on 

 tlie neck, a considerable way behind the right tentacle. The skin 

 is not tubercled. There is no operculum. 



SJiell. — Large, high, thin, white, alabaster-like in texture, with. 

 an oval body, a smallish high scalar spire, ending in an irregular, 

 blunt but pointed, twisted apex ; it has a large oval mouth, a nar- 

 row, patulous, not reverted, outer lip, a broad, shallow, truncated 

 canal in front, a broadly spread inner lip, and a' straight, toothless, 

 but interrupted pillar. Scul])turc. The whole surface is minutely 

 granulated, and has the appearance of having been dipped in 

 thin, rather sandy whitewash, and then roughly wiped, especially 

 round the suture. Longitudinals — there are rounded irregular 

 lines of growth, which are generally slight, but all round the 

 mouth-edge a few become somewhat sti'ong. Spirals — there are 

 a few unequal and irregular, broad, scarcely raised threads ; near 

 the suture are a few irregular, sharper, quite superficial lines 

 like the marks of rough wiping. Colour alabaster- white, with a 

 roughened, dead, eroded surface. Spire high, rather small, scalar. 

 Apex is blunt, but projects sharply to one side in an excentric 

 and irregular manner. Whorls 5^, of rapid increase, droopingly 

 shouldered above, then convex, perpendicular below, with a slight 

 tendency to contraction above the suture ; the last especially 

 is ventricose and oval, with very regular curves. Suture very 

 oblique, deeply impressed, and a little canaliculate. Month oval, 

 straight, rounded above, and not at all siuuated ; it ends below in 

 a broad, open, shallow, scarcely emarginated canal. Outer lip 

 very regularly curved, with a narrow straight edge, which is pro- 

 minent and patulous, but not in the least reverted ; it does not 

 rise at all on the body-whorl. Inner lip spreads on the body 

 very widely, but somewhat thinly, as a straw-coloured glaze ; 

 above it is very oblique, but scarcely convex ; it forms an angle 

 at its junction with the pillar, which is perpcndicidar and scarcely 

 twisted ; the rounded edge is formed by a narrowish thickened 

 white callus, which about halfway down is suddenly contracted and 



