1072 SERPULA. 



D'Jvila, t. 4. f. F. Martini, i. p. 58. t. 3. f. 20 E. 



Inhabits the coasts of America, St. Domiogo, Martinique, and 

 St. Helena. Favanne. 



The numerous volutions are often turned laterally inwards, like 

 the whirls of Helix Vortex, and form a flat disk an inch or 

 more in diameter, but they sometimes rise spirally with less 

 regularity upon each other. The tube scarcely exceeds a 

 line in diameter, and the colour on the outside is dull white, 

 but within it is glossy. 



SPIRILLUM. 6. Shell regular, spiral, orbicular, and 

 pellucid ; whirls taper. 



Serpula Spirillum. Linnaus Si/st. Nat. p. 1264. Martitii, 

 I p. 57. t. 3. f. 20, C and D. Schroeter Einl. ii. p. 537- 

 Fabricius Fauna Groenl. p. 376. Gmelin, p. 3740. 

 Montagu, p. 499. Maton and Racket, in Lin. Trans. 

 viii. p. 240. Dorset Cat. p. 59- 1. 19. f. 27.* 

 Plancus, 1. 1. f. 8. Ginanni Adr. ii. 1. 1. f. 7. 

 Inhabits Sertularize and other Zoophites, on most of the Eu- 

 ropean shores. 

 Shell white, glossy, slightly wrinkled, with four or five rounded 

 and longitudinally striated volutions, which together are not 

 more than one line in diameter, and by this it may be known 

 from S. spirorbis, which has only two volutions. Mr. 

 Montagu's <S'. sinistrorsa appears to be nothing more than 

 a reversed Variety of this species; and Gmelin's S.porrecta 

 appears also to be only a Variety, for the principal, if not the 

 only difference, consists in its not having any wrinkles, and in 

 being of a more snowy white. 



MI NUT A. 7. Shell regular, spiral, and orbicular, 

 with the whirls reversed, taper, and trans- 

 versely wrinkled. 



Serpula minuta. Montagu Test. p. 505. Maton and Rac- 

 ket, in Lin. Trans, viii. p. 241. 



Inhabits the sea on Corallina officinalis ; frequent on the Eng- 

 lish coasts. Montagu. 



Shell white, opake, with two or three volutions, and not half 

 the size of the reversed Variety of S. Spirillum, from which 

 it also difi*ers in being transversely wrinkled, and not longitu- 

 dinally striated. Mr. Montagu says it has sometimes a slight 

 longitudinal furrow on each side, forming a ridge or carina 

 along the back. 



