a Genus of quasiparasitic Mollusks. 331 
5. S. ovoideus, H. & A. Adams. 
Syn. S. astericola, A. Adams. 
Hab. Borneo, in the body of an Asterias: A. Adams. 
6. S. Orbignyanus, Hupé. 
Hab. New Holland, enclosed in the spines of Cidaris impe- 
rialis: Hupé. 
7. S. robustus, Pease. 
Hab. Sandwich Isles, on Echini: Pease. 
8. S. apiculatus, Souverbie. 
Hab. New Caledonia?: Montrougier. 
9. S. eburneus, Deshayes. 
Hab. Isle of Bourbon, on Echini and Asterie: Maillard. 
B. Spire long. 
10. S. corallinus, Chemnitz. 
Hab. West Indies, in madrepores and other corals : Chemnitz. 
11. S. subulatus, Broderip. 
Hab. West Indies? 
12. S. Barronii, A. Adams. 
Hab. Tropical seas, encysted in the integuments of an Aste- 
rias: Barron. 
13. S. exaratus, A. Adams. 
Hab. Philippine Isles, in the integuments of an Asterias: 
A. Adams. } 
14. S. subangulatus, A. Adams. 
Hab. West Indies. 
15. S. Acicula, Gould. 
Syn. Eulima vitrea, Av Adams. 
Hab. Fiji Isles, in Holothurie: United States Exploring 
Expedition. 
16. S. Pauluccia, Fischer. 
Hab. Red Sea, among the spines of Echinus trigonarius, Lam.: 
Marquise Paulucci. 
Besides the above, may be noticed an undescribed or unnamed 
species dredged by Mr. M‘Andrew off the Canary Isles (if it is 
not S. Turtoni), another collected at Guadeloupe by M. Beau, 
and five more, bearing the following names, but without de- 
