412 DR. A. FARRE ON THE STRUCTURE OF THE CILIOBRACHIATE POLYPI. 
along the bottom of the watch-glass upon one end and with a waddling gait; but 
generally after a few hours all motion ceases, and they are found to have attached 
themselves to the surface of the glass. At the expiration of forty-eight hours the 
rudiments of a cell were observed extending beyond the margin of the body (fig. 24.); 
but at this stage the animals invariably perished, and during repeated observations I 
had no opportunity of witnessing their further metamorphosis. At this stage the cilia 
had disappeared, and the muscular lobes were no longer apparent. None of these 
gemmules were spontaneously evolved, and their death appeared to be owing to their 
premature extraction. The parenchyma of the gemmules has a contractile power, 
somewhat like that of Hydra, but less in degree, by which the form of the body is 
occasionally altered. If a portion of the margin with the cilia attached be torn off. 
the cilia continue to vibrate, as when a portion of one of the tentacles has been so 
isolated. 
PLATE XXVII. fig. 1—5. 
Memhranipora pilosa , Blainv. 
Syn. Eschar a Millepora , Ellis, Corall. pi. xxxi. f. a. A. 
Flustra pilosa , Linn., Gmel., p. 3827* No. 3. Blainv., Diet, des Scien. Nat., 
Art. Zooph., p. 415. Flem., Brit. Anim., p. 53 7. Gen. Ivi. 147- 
Flustra dentata, Linn., Gmel., p. 3828. No. 11. Ellis, Corall. pi. xxix. d. 
Blainv., Diet, des Sc. Nat., p. 414. 
This evidently belongs to the genus Memhranipora of Blainville # , though not in- 
cluded in it by him. It unites Flustra pilosa and dentata ; the only difference be- 
tween which is in the length of the anterior spine of the ceil, a character which varies 
in every degree even in the same specimen. 
Fig. 1. The animal in many respects very closely resembles Halodactylus dia- 
phanus, but its form is far less elegant. The arms are twelve (rarely eleven) in 
number, ciliated and furnished with long spines. They are very long in proportion to 
the body, but thick and rather clumsy, and during expansion are frequently curled 
inwards at their extremities. 
The base of the tentacles appears to be surrounded by a delicate band, which is 
placed on their outer side as if for the purpose of bringing them together, and imme- 
diately within which they unite to form the tentacular ring (fig. 2.). The appearance 
of a circumferential vessel in the substance of the ring, and the tentacular canals 
were observed here as in Halodactylus. 
The pharynx also in every respect confirmed the observations upon that species, 
especially in its mode of expansion, and in the position of the dark line, the triangular 
space, &c. The flask-shaped body was here also occasionally observed, but without 
affording any additional information. It was much larger in proportion to the length 
* Diet, des Sc. Nat. Art. Zooph., p. 411, 
