1076 SERPtJLA. 



Serpula vitrea. Fabricius Fauna Groenl. p. 382. Gmelin, 

 p. 3746. 



Inhabits the shores of Greenland on Sertulariaj, shells, stones, 

 and Fuci. Fabi'icius. 



Shell not a line in diameter, thick, white, or sometimes reddish, 

 glossy, and pellucid. Fabricius says it is allied to S. glome- 

 rata ; and Messrs. Montagu, Maton, and Racket have sup- 

 posed it to be the same as S. lucida, but in that species the 

 edge of the aperture is not thickened, and the whirls are re- 

 versed. 



€ONTORTUPLiCATA. 18. Shell semi-rouiid, wrinkled, 

 glomerated, and carinated. 



Serpula contortuplicata. Linnaus Si/st. Nat. p. 1266. 



Martini, i. p. 67. t. 3. f, 24 J. Burn Mas. p. 437. 



Schroeter Finl. ii. p. 545. Gmelin^ p. 3741. Lamarck 



Syst. des Aiiim. p. 326. 

 Le JBoyau de Mer. Favanne, i. p. 650. t. 6. f. E 1. 

 Bonanni Rer. and Kirch, i. t. 20. f. G. yJrgenviJle, t. 4. f. D. 

 Inhabits the European Ocean. Linnaus. Mediterranean. 



Fy Atila. Coasts of Provence. Favanne. 

 It appears to me that this species was formed by Linnaeus 

 from those shells of S. triqnetra which are not spread out at 

 the base so as to give them a triangular appearance, and, as 

 is frequently the case, they then answer tolerably well to the 

 most striking part of his description, 'semitereti carinata.' 

 Da Costa, Montagu, and Racket have also considered S. 

 contortuplicata and S. triquetra to be the same ; but the 

 figures referred to by Martini, Born, Schroeter, Favanne, 

 and Gmelin, appear to be different, and probably may belong 

 to a separate species ; though never having seen any shell 

 which answers to them, I have not ventured to make the 

 alteration. 



NEBULOSA. 19. Shell thick, wrinkled, and much 

 twisted ; aperture large and indented. 



Les Intestins. Favanne, i. p. 652. t. 6. f. I. 

 D'Jvila, t. 4. f. H. 



Inhabits the American seas. Favanne. 



Shell thick, extremely wrinkled, white clouded with dark 

 fawn-colour, and much twisted and plaited together, so as 

 generally to conceal the lower extremity, which terminates in 

 a point ; the diameter of the largest tube is said by Favanne 

 not to exceed three or four lines, and it expands at the aper- 

 ture, which widens at the edge. From the appearance of 



