DENTALIUM. 1069 



closed, rounded, and sub-marginated. Length scarce one 

 line, and the diameter one-fifth of the length." 



PELLUCiDUM. 15. Shell taper, nearly straight, 

 horny, flexible and smooth. 



Dentalium pellucidum. Gmelin, p. 3738. 



Dentalium, No. 9. Schroeter Einl. ii. p. 529- t. 6. f. 17. 



Inhabits the North Sea. Schroeter. 



Shell two inches and a quarter long, very narrow and thin, and 

 of a pale honey-colour ; Schroeter says it will not effervesce 

 with acids, and it may therefore be doubted whether it be- 

 longs properly to the Testacea. 



