XX 



Flexilis(f). 



SPIRORBIS. 



Nautiloides, 9. 

 Spirillurr, 9. 

 Granulata, 10,/. 64. 

 Heterostropha, 10. Young 



? Minuta, 11. 

 Carinata, 10. 

 Corrugata,\\,f. 65. 

 Ludda, ll,/. 63. 

 Cornea, 12. 



Conica, 243. 



SERPULA. 



Mulleri, 12, (8. Fin- 

 cularis, Montagu and 

 Turton,) (g). Variety 

 Spirorbis Reversa, 12. 

 Variety coiled up in 

 substances to which it 

 cannot attach itself, 

 Solitaria, 265,/. 67. 



( f ) Tube free, subcylindrical, flexuous, elastic, 

 scarcely, if at all, tapering, membraneous, without (for the 

 most part) sand, stones, broken shells, or any foreign 

 substances attached ; the lines of growth circular, the 

 thickness not exceeding a crowquill. Scarborough, from 

 6 to 8 inches in length. 



(a) I may as well mention that the variety B. of Tur- 

 ton 's Dictionary, (p. 152,) is but a V. Triquetra, so 

 located as to be unable to spread at the base. I state 

 this from the possession of a specimen authenticated by 

 Turton. The variety Solitaria, were it not always flat- 

 tened above and considerably smaller, might easily be 

 confused with Tubularia. 



