]C)6 SPECIFIC 



Specimen white, brownish towards the tip ; lon- 

 gitudinally wrinkled and transversely rugose. 

 Inhabits the Adriatic, Atlantic, and Indian Seas. 



Fig. 3. S. aquaria. 



Shell round, straight ; circumference of one 

 extremity radiate ; disk furnished with cylindrical 

 pores. 



Lister Conch. Tab. 548. Fig. 3. 



Specimen white, nearly smooth, gradually atte- 

 nuated, smaller end open; larger one closed, convex. 



Inhabits India. 



Fig. 4. Teredo navalis. 

 Shell thin, cylindrical, smooth. 

 Rumph. Mas. 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. 



