82 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 TOURNEF. Instit. Rei herbaria Tab. 342 

 (the Polypary) ; for this animal and its organisation compare especially the 

 beautiful plate in FREYCINET, Voyage de VUranie, Zool. PI. 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 Tubipora musica. The Polypary in 

 all the species is purple-red ; in the Indian species which PERON ( Voyage 

 aux terres Australes I. p. 146), and QUOY and GAIMARD ( Voyage de VUranie, 

 Zoologie, pp. 634 641 and PI. 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. xxxm. fig. 2), and in 

 Tubipora rubeola QUOY (Voyage de V Astrolabe, Zool. iv. pp. 357 359), 

 GUE'RIN Iconographie, ZoopJi. PI. xxn. fig. i, where the fin-like indents 

 at the edge of the tentacula stand in a single row, as in Tubip. Hempricliii 

 EHRENB., whilst in Tubipora 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 GOLDF. from the oldest limestone (mountain-lime). 



Family VII. C&rticata. 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 (corticiferes) of LAMARCK form a division very 

 nearly allied to Alcyonium and Pennatulina. The polypary is here 

 in rts 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 Pennatulina. 



