TUBICOJJE. 129 



In others the operculum is flat and bristled with more numerous 

 points*. One of them is the 



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

 among the Madrej>ores, which frequently surround its tube; tho 

 branchiae become spirally convoluted when they enter the latter, 

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

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



SPIRORBIS, Lam., 



Where 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, Cut. 



The same kind of body, and similar flabelliform branchiae, as the 

 Serpulae ; but the two fleshy filaments adhering to these branchiae 

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

 time they are even wanting. The tube of the Sabellae is most com- 

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

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

 able for tin i i delicacy and brilliancy. 



Some of them, like the Serpulae, have a membranous disk on ther 

 ant-M ior part of the back, through which pass the first pairs of the 

 bundles of setae; their pectiniform branchiae are spirally contorted, 

 and their tentacula reduced to slight folds ||. 



Sab.protula, 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.^[ 



They are the GALEOLARI.E, Lam. A single operculum is seen, Berl., Schr., 

 i, 6. 



f The same as the Ttrebella bicornis, Abildg., Berl. Schr., IX. iii, 4 ; Seb., Ill, 

 xvi, 7, and as the Actinia, or Animul-Jioicer, Home, Lect. on Comp. Anatom., II, 

 pi. 1. M. Savigny established his subdivision of the SERPUL.* CYMOSPIR.C, of 

 which M. dt- Hluinville has since made a genus, upon this spiral convolution of the 

 branchiae. 



Add, Terebdla sttlluta, Cm., Abildg., loc. cit. f. 5, remarkable for its operculum, 

 which is composed of three plates strung together. 



..'.'MHI, Tall., Nov. Act. Petrop., V, pi. v, f. 21; Serp. spirorbif, 

 Mull., Zuol. Dan. Ill.lxxxvi, 16. 



'i >:i the works of Linnaeus and Gmclin, designates various animals, 



\\ith factitious, an/1 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 dh id, which he places among his Serpulte. Our Sabelke 



are the AMPHITKITRH of Lamarck. 



|| Th'n dM'Snn u irft 1>y M. Savigny among the Serpulse, and constitutes his 

 SKRPULA SPIRAMKLLJC, of which M.de Blainville has since made his genus SPIRA- 



MELLA. 



5 Thet-v this mnirnificent species, and the calcareous nature of its 



tube, arc incontestable, notwithstanding the doubt expressed in the Diet, des Sc., 



Nat., LVII, p. 443, note. The SaMla bispiralu,Amphi(ritc rolufucornis, Lin. 



differs but slightly from it. I dare not assert it is the same as 



I. ndx, i, erroneously cited by Pallas and Gmelin under Serpvla giyantea, 



for that figure shows no disk. 



VOL. in. K 



