270 SERPULID^. 



all the species. Nor have I discovered any character in the bristles 

 that could help us to specific discrimination, 

 a. (a) South Devon, G. Montagu. 



(b) South Devon, G. Montagu. 



(c) Torbay, J. R. Griffiths. 



(d) Aberystwith, J. Ilenslow. 

 {e) Berwick Bay, Br. Johnston. 



ft. (a) Exmouth, TFm. Clark. 



2. S. intricata, branchiae with many filaments in each tuft ; opercu- 

 lum doubly infundibuliform, multiserrulated on the margin, the 

 upper funnel crenate, with a shallow disc. — Tube cylindrical, 

 wrinkled, partially free, irregularly clustered, the aperture circular 

 and plain. 



Serpula intricata, Linn. Sysf. 1265. Turt. Gmel. iv. 603. Stew. 



Elem. ii. 422. Billw. Cat. Rec. Sh. 1073. 

 Serpula vermicularis, Miill. Zool. Dan. iii. 9. tab. 86. f. 9. Mont. 



Test. Brit. 509. Laskey in Wern. Mem. i. 413. Brown in ibid. ii. 



634. Stew. Elem. ii. 422. Turt. Brit. Faun. 201. Fleming in 



Edinb. Encyclop. vii. 67. Turt. Conch. Diet. 152. 

 Vermilia intricata, Fleming in Edinb. Phil. Journ. xii. 242. 

 Serpula Miilleri, Berkeley in Loud. Mag. Nat. Hist. vii. 421. 



Hab. The coralline region, attached to old shells, particularly to 

 Venus islandica. 



Obs. Tube 2-3" long, entirely adherent or partially free, tortuous 

 and bent upon itself, or irregularly spiral, or sometimes nearly straight, 

 but never, so far as I have observed, collected into entangled masses ; 

 dirty white, cylindrical, transversely wrinkled, with a round even 

 aperture. It "is never observed to spread at the base, or to possess 

 the smallest degree of carina along the back." — The animal is shorter 

 than the tube, of a straw-yellow colour on the superior half, but 

 orange-coloured below. The branchiae are spotted or annulated with 

 orange, and the filaments are ciliated until near the apices, which 

 are naked. The operculum is supported on a cartilaginous stalk 

 which expands into a regular funnel ; and from the centre of this 

 another funnel, of less size and with a shallower disc, is projected. 

 The margin of both of them is neatly denticulated. Sordes usually 

 adhere to the disc of the outer one, and obscure its character. 



3. S. reversa, branchiae with about sixteen filaments in each tuft ; 

 operculum doubly infundibuliform, the lower with a multiserrulated 

 margin, the upper with a marginal series of thorny elongated spines. 

 — Tube cylindrical, more or less spiral. 



Serpula reversa, Mont. Test. Brit. 608. Turt. Brit. Faun. 201. Penn. 



Brit. Zool. edit. 1812, iv. 361. 

 Spirorbis reversus, Fleming in Edinb. Encyclop. vii. 69. Brown*s 



Illustr. pi. 1. f. 52. 



