58 SCISSURELLA. 



very oblique ; the fissure is very narrow. Outer lip 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. Alt. -0-44 in., diam. '063. ( Watson.) 



A small species of great beauty, differing in form of sculpture 

 from Schismope carinata Wats., with which it has some relation. 

 ( Watson.) 



Raine Island, Cape York, N. E. Australia, 155 fms. 



Scissurella declinans Watson, Challenger Rep. Gasterop., p. 115, 



t. 8, f. 2, 1886. 



S. obliqua Watson. PI. 58, figs. 20, 21. 



Shell small, depressedly and obliquely globose, rough, and un- 

 adorned 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 lines of growth. Color 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. 



Alt. -037 in., diam. -041. (Watson.) 



This is a very small and unattractive-looking species, entirely desti- 

 tute of the beautiful sculpture common in the genus. Compared to 

 S. supraplicata Smith, from Swains Bay, Kerguelen, this is much 

 smaller, more depressed, more oblique, and unsculptured. ( Watson.) 



Royal Sound, Kerguelen Islands. 



Scissurella obliqua Watson, Challenger Rep., Gasterop., p. 116, t. 

 8, f. 5, 1886. 



