TUBICOLiE. 129 
111 others the operculum is flat and bristled with more numerous 
points * * * § . One of them is the 
Serp. gigantea, Pall., Misceh, X, 2, 10. It is always found 
among the Madrepores, which frequently surround its tube; the 
branchiee become spirally convoluted when they enter the latter, 
and its operculum is armed with two small branching horns, re- 
sembling the antlers of a deer f. M. Lamarck distinguishes the 
Spirorbis, Lam., 
AVhere the branchial filaments are much less numerous — three or 
four on c.rch side ; the tube is regularly spiral, and the animal usually 
very small 
Sabella, Ctiv . § 
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- 
times 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 their delicacy and brilliancy. 
Some of them, like the Serpidae, have a membranous disk on the 
anterior 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. prof ula, C\\v.\ Protula Rudolphii,Yi\sso. A large and 
splendid species inhabiting the Mediterranean. Its tube is 
calcareous, like that of the Serpulae, its branchiae orange- 
coloured, See. ^ 
* They are the Galeolari.e, Lam. A single operculum is seen, Berl., Schr., 
IX, iii, 6. 
-f' The same as the Terebella bicornis, Ahildg., Berl. Schr., IX. iii, 4 ; Seb., Ill, 
xvi, 7, and as the Actinia, or AnimaJ -flower, Home, Lect. on Comp. Anatom., II, 
pi. 1. M. Savigny established his subdivision of the Serpulae Cymospir.e, of 
which M. de Blainville has since made a genus, upon this spiral convolution of the 
branchiae. 
Add, Terebella stellafa, Gm., Abildg., loc. cit. f. 5, remarkable for its operculum, 
which is composed of three plates strung together. 
J Serpula spirillum, Pall., Nov. Act. Petrop., V, pi. v, f. 21 ; — Serp. spirorbis, 
Miill., Zool. Dan. Ill, Ixxxvi, 1 — 6. 
§ This name, in the works of Linnaeus and Gmelin, designates various animals, 
with factitious, aufl 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, which he places among his Serpulae. Our Sabellae 
are the Amphitrites of Lamarck. 
II This division is left by M. Savigny among the Serpulae, and constitutes his 
Serpul.e Spiramele.e, of which M. de Blainville has since made his genus Spira- 
MELLA. 
^ The existence of this magnificent speeies, and the calcareous nature of its 
tube, are incontestable, notwithstanding the doubt expressed in the Diet, des Sc., 
Nat., LVII, p. 443, note. The Sahella bispiralis, — Amphitrite volufacorriis, Lin. 
Trans., VII, vii, differs but slightly from it. I dare not assert it is the same as 
Seb., I, xxix, 1, erroneously cited by Pallas and Gmelin under Serpula yiyanfea, 
for that figure shows no disk. 
VOL. III. 
K 
