TUBICOLjE. 129 



In others the operculum is flat and bristled with more numerous 

 points *. One of them is the 



Serp. giganlea. Pall., Miscel., X, 2, 10. It is always found 

 among the Madrepores, which frequently surround its tube; the 

 brancliice become spirally convoluted when they enter the latter, 

 and its operculum is armed with two small branching horns, re- 

 sembling the antlers of a deerf. M. Lamarck distinguishes the 



Spirorbis, Lam., 



AVhere the branchial filaments are much less numerous — three or 

 four on each side ; the tube is regularly spiral, and the animal usually 

 very small J. 



Sabella, Cui. § 



The same kind of body, and similar flabelliform branchia-, as the 

 Serpulae; but the two fleshy filaments adhering to these In-anchiae 

 both terminate in a point, and without forming an operculum ; some- 

 times they are even wanting. The tube of the Sabellee is most com- 

 monly composed of granules of clay or mud, and is rarely calcareous. 

 The species known are large, and their fan-like branchioe remark- 

 able for their delicacy and brilliancy. 



Some of them, like the Serpuke, have a membranous disk on the 

 anterior part of the back, through which pass the first pairs of the 

 bundles of setee ; their ijectiniform 1 ranchise are spirally contorted, 

 and their tentacula reduced to slight folds Ij. 



Sab. prohda, Cuv. ; Protula Rudolphii, Risso. A large and 

 splendid species inhabiting the Mediterranean. Its tube is 

 calcareous, like that of the Serpulae, its branchiae orange- 

 coloured, &c. ^ 



* Thevare the Galeolari^i:, Lam. A single opeiculum is seen, Berl., Sclii-., 

 IX, i;i, 6. 



t The same as the Tercbella bicornis, Abildg., Beil. Schr., IX. iji, -1 ; Seb., Ill, 

 XV!, 7, anil as the Actinia, or Auimul-fowvi; Home, Lect. on Comp. Anatoni., II, 

 pi. 1. M. Savigny established his subdivision of the Serpulae Cymospir.^i, of 

 which M. de Blaiaville has since made a genus, upon this spiral convolution of the 

 hranchiee. 



Add, Tci-ebdla sidlala, Gm., Abildg., loc. cit. f. 5, remarkable for its opcrciilum, 

 which is composed of three plates strung togetlier. 



J Serpula- spinUi'.m, Pall., Nov. Act. Petrop., Y, pi. v, f. 21 ; — Serj). sjnrorbis, 

 Miili., Zool. Dan. Ill, L^xxvi, 1—6. 



§ This name, in the works of Linnaeus and Gmelin, designates various animals, 

 with factitious, aud not transuded, tubes ; we restrict its application to those which 

 resemble each other in their peculiar characters. M. Savigny employs it in the latter 

 way, our first division excepted, vihich he places amor.g his Serpuke. Our Sabella: 

 are the Amphitrites of Lamarck. 



II This division is left by M. Savigny among the Serpulse, and constitutes his 

 SERPULiE Spikamell^e, of which M.de Blainville has since made his genus Spira- 



MELLA. 



^ The existence of this magnificent species, and the calcareous nature of its 

 tube, are incontestable, notwithstanding the doubt expressed in the Diet, des Sc, 

 Nat., LYII, p. 443, note. The Sabella bispiralis, — Amphitrite rohducorrds, Lin. 

 Trans., VII, vii, differs hut slightly from it. I dare not assert it is the same as 

 Seb., I, xxix, 1, erroneously cited by Pailas and Gmelin under Serpula gir/antea, 

 for that figure shows no disk. 



VOL. III. K 



