S20, CLASS II. 
Family VI. Tubiporina. Polypary calcareous, of parallel 
tubes, close set, conjoined by transverse partitions. Polyps tubular, 
the neck retractile, soft, the lower part indurated, forming the poly- 
pary. Tentacles in single or double row at the margin, retractile by 
involution. 
Tubipora L. (exclusive of several species). 
Sp. Tubipora musica L., Tubularia TourNnEF. Instit. Rei herbaria Tab. 342 
(the Polypary) ; for this animal and its organisation compare especially the 
beautiful plate in Freycinet, Voyage de ?Uranie, Zool. Pl. 88. The 
Organ-Coral consists of cylindrical, hollow tubes, standing perpendicular 
with transverse partitions. These last arise from a horizontal expansion, 
which at the top of the tube surrounds its circumference radially. The 
expansions connect the tubes together, and become partitions when the 
tubes above them begin to grow. From this elongation of the tubes 
their jointed form arises, and when the growth ceases, they form a new 
transverse expansion round the wall of their aperture. EHRENBERG has 
distinguished the species of this genus more accurately: they are usually 
comprised under the collective name of Zubipora musica. The Polypary in 
all the species is purple-red ; in the Indian species which Pron (Voyage 
auax terres Australes I. p. 146), and Quoy and GAIMARD (Voyage de [ Uranie, 
Zoologie, pp. 634—641 and Pl. 88) observed, the Polyps are green, in others 
they are whitish or light red, as in those which CHAMISSO described (Nov. 
Act. Acad. Leop. Carol. N. C. Tom. x. p. 370, Tab. xxxim. fig. 2), and in 
Tubipora rubeola Quoy (Voyage de lV Astrolabe, Zool. IV. pp. 357—359), 
GUERIN Iconographie, Zooph. Pl. Xxi1. fig. 1, where the fin-like indents 
at the edge of the tentacula stand in a single row, as in Tubip. Henvprichit 
EHRENB., whilst in Zubipora musica EHRENB. to which FREYCINET’S plate 
* quoted above refers, they form a double row. 
To Tubipora fossil Polyparies appear to belong, Catenipora (escharoides) 
and Syringopora Goupr. from the oldest limestone (mountain-lime). 
Family VII. Corticata. Polypary fixed, ramose, its bark soft, 
supplied with calcareous spicula or granules, polypiferous, its axis 
hardish stony or horny. Polyps retractile, with tentacles having 
a single row of small conical appendages at the margin, gemmi- 
parous and oviparous, conjoined by canals creeping through the 
bark. 
The barked-corals (corticiféres) of LamARcK form a division very 
nearly allied to Aleyoniwm and Pennatulina. The polypary is here 
in its origin and mode of structure very different from that of the 
Tubiporina, but on the other hand resembles that of the Penna- 
tulina. The hard axis, which alone is usually preserved in collec- 
tions, may be compared with that of the Pennatulina; they are, in 
a word, fixed Pennatuline. 
