178 SPECIFIC 



Fig. 3. S. Aquaria. 



Shell round, straight ; circumference of one ex- 

 tremity radiate; disk furnished with cylindrical 

 pores. 



Lister Conch, tab. 548. fig. 3. 



Specimenwhite, nearly smooth, gradually attenu- 

 ated^ smaller end open ; larger one closed, convex. 



Inhabits India. 



Fig. 4. Teredo navalis. 

 Shell thin, cylindrical, smooth. 

 Rumph. Mus. tab. 41. fig. F. G. 

 Specimen white, flexuous, rather tapering. 



Fig. 5. Sabella Chrysodon. 



Shell subcylindrical, papyraceous, formed of 

 testaceous fragments. 



Martyn Conch. 1. tab. 4. fig. 29,30. 



Specimen dirty yellow; the particles of sand and 

 shells adhere to a film, which is flexible when wet. 



Inhabits Europe, India, and the Cape of Good 

 Hope. 



The figure given in the plate is not an entire 

 specimen, but a part only, to show the general ap- 

 pearance of the species. 



