276 



thin, produced in a roundly-angular lobe above the vertex. 

 Cokimella deeply and uniformly concave. Inner lip a mod- 

 erately wide glaze. A minute rimate umbilicus. 



Sriilpfi/re. — Numerous, flat, low spiral lirse, about one- 

 third the width of their interspaces : at the vertex obsolete, 

 in the middle more crowded. Subdistant accremental striag- 

 and undulations. 



JJim. — Length, 4'3 mm.: breadth, 35 mm. 



Lorality. — In 130 fathoms off Cape Jaffa, 1 dead. 



Aglaja troubridgensis, n. sp. PI. xx., iigs. 4 and 5. 



Shell about two and a half whorls, detached : depressed 

 conic ; apex somewhat lower than the rest ; inner margin not 

 uniformly curved, thick, opaque white to an irregular deptk 

 varying from 2 to 4 mm. ; outer part thin, translucent, with, 

 a membranous edge ; surface irregularly corrugated by ob- 

 liquely retrocurrent folds, which roughen the inner margin. 

 Internally somewhat rugose. 



Di?}i. — Greatest diameter, 21 mm. ; smallest, 15 mm. ;. 

 height, 21 mm. 



Locality. — Troubridge Island, among the rocks. Ani- 

 mals collected by Miss Fraser. Shells only preserved. 



Ohs. — Whether an Aglaja or a Xavanax, an examina- 

 tion of the animal will decide. I have adopted Renier's gen- 

 eric name instead of the Doridium of Meckel, following 

 Try on. 



