a Genus of quasiparasitic Mollusks. 831 



5. S. ovoideus, H. & A. Adams. 



Sjm. S. astericola, A. Adams. 

 Hab. Borneo, in the body of an Asterias : A. Adams. 



6. S. Orhignyanus, Hupe. 



Hab. New Holland, enclosed in the spines of Cidaris impC' 

 rialis : Hupe. 



7. S. robustuSy Pease. 

 Hab. Sandwich Isles, on Echini : Pease. 



8. S. apiculatus, Souverbie. 

 Hab. New Caledonia ? ; Montrougier. 



9. S. ehumeus, Deshayes. 

 Hab. Isle of Bourbon, on Echini and Asteria : Maillard. 



B. Spire long:. 



10. S. corallinus, Chemnitz. 



Hab. West Indies, in madrepores and other corals ; Chemnitz. 



11. S, gubulatuSf 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. subangulatxts, A. Adams. 



Hab. West Indies. 



15. S. Acicula, Gould. 

 Syn. Eulima vitrea, A. Adams. 

 Hab. Fiji Isles, in Holothuria: United States Exploring 

 Expedition. 



16. S, Pauluccia, Fischer. 



Hab. Red Sea, among the spines of Echinus trigonariuSjliSLm.: 

 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- 



