116 THE VOYAGE OF H.M.S. CHALLENGER 



Spire slightly raised, and scalar in very short angular steps. Apex extremely small, 

 tabulated. Whorls 4, of very rapid increase, almost perfectly flat above, keeled by the 

 canal-ridge, below this slightly constricted and then tumid. Suture obtuse angled. Mouth 

 round, small, not very oblique ; the fissure is very narrow. Outer Up very regularly curved. 

 Inner lip very short and thin on the body, sharp and thin and not much expanded on the 

 pillar. Umbilicus defined by a keel and channelled. L. 0-044 in. B. 0*063. Mouth, 

 length 0-03, breadth 0-031. 



A small species of great beauty, differing in form of sculpture from Schismqpc carinata, Wats., with 

 which it has some relation. 



6. Scissurella obliqua, n. sp. (PI. VIII. fig. 5). 



January 19-20, 1874. Royal Sound, Kerguelen Islands, shore. 



Shell. — Small, depressedly and obliquely globose, rough, and unadorned in any way, with 

 a small, rounded, barely prominent apex, a large, round, very descending mouth and small 

 umbilicus. Sculpture : none, but some harsh and irregular fines of growth. Colour semi- 

 transparent white beneath a yellow epidermis. Spire slightly raised, and more or less 

 subscalar. Apex very small, and the extreme tip is tabulated. Whorls 3^ to 4, of very 

 rapid increase, well rounded, but a little flatter and more sloping above than below ; they 

 are scored by the old canal, which lies about half-way between the periphery and the 

 suture, presenting no ridge, but scored across as usual with concave lines. Epidermis 

 yellow, membranaceous, rather thick. Suture slightly openly impressed. Mouth round, 

 but very oblique. Outer lip thin and sharp, shortly but rather widely cleft; a little 

 inflected above, excessively patulous on the base. Inner lip thickened, extremely short, 

 and slightly disunited from the body ; very concave on the pillar, where it is bent back so 

 as to cover the umbilical perforation, which presents a narrowed and not pervious but very 

 strong depression. Operculum large, corneous, thin, yellow, with central nucleus and 

 many spiral whorls, which seem to become more numerous toward the margin. L. - 037 in. 

 B. 0-041. Mouth, length 0-024, breadth 0*026. 



This is a very small and unattractive-looking species, entirely destitute of the beautiful sculpture 

 common in the genus. Compared to Scissurella supraplicata, E. Sm., from Swains Bay, Kerguelen, 

 this is much smaller, more depressed, more oblique, and unsculptured. 



8. Schismope, Jeffreys, 1856. 



This genus is the Woodwardia of Crosse and Fischer, which they put along with Plcurotomaria in 

 the Family Pleurotomariidse. 



