516 ZOOPHYTA. CORALLINAD.E. Lobularia. 



towards the tip become alternate ; they are clavate with rough ends M. 



Lamouroux has strangely confounded his Alcyonium lobatum and the A. exos 

 of Dr Spix with this species. With every allowance for the discrepancy 

 which may prevail among the representations of the same animal, examined 

 under different circumstances, by unconnected observers, it is impossible to 

 admit that the figures given by Ellis, which have been referred to and those 

 communicated by the above named observers, can have been taken from in- 

 dividuals of the same species. The tentacula in Ellis's figures (and having 

 compared these with nature we can pronounce on their accuracy) are pinnate 

 and pointed. In the Alcyonium exos of Dr Spix (Annales du Mus. xiii. 

 t. xxxiii. f. 7-) the tentacula are subclavate, blunt, and villous ; while in the 

 A. lobatum of M. Lamouroux (Hist. Cor. 336. t. xiii. B, C, H.) they are subcy- 

 lindrical, rounded at the extremity, and covered above and on the margin 

 with blunt tubercles. In our examination of several specimens, from differ- 

 ent parts of the coast, varying in form and colour, we have only met with 

 the species figured by Ellis. It is probable, however, that the others may 

 be detected in our seas. 



Gen. XXXVIII. CYDONIUM.— A coriaceous skin, inter- 

 nally carneous, with numerous straight ridged spicula, per- 

 pendicular to the surface ; polypi with a central opening, 

 and an orifice at the base of each of the eight pinnated ten- 

 tacula. 



84. C. Mulleri. — Skin yellowish, with numerous stellate 

 pores; internally brown. 



A. cvdonium, Mull. Zool. Dan. t. 81. f. 3, 4, 5. Jameson, Wern. Mem. 

 i. 5 03 — Zetland. 

 Base of adhesion narrow, body massive, surface irregular ; the skin consists 

 of animal matter cementing innumerable round siliceous grains ; the cells lead- 

 ing from the stellate pores are indistinct ; the spicula, which converge towards 

 the centre, are fusiform, grouped in small bundles, and many of them at the 

 skin are tricuspidate. In a dried specimen from Zetland, which I have had 

 an opportunity of examining through the kindness of Professor Jameson, the 

 surface is slightly villous, owing probably to the contraction of the skin, leav« 

 ino- the extremities of the fibres free. With the exception of the stellate pores, 

 it agrees with the Alcyonium primum Dioscoridis of Donati (Adriat. 56. t. ix. 

 f. i.j in the villous skin and the simple and tricuspidate spicula. 



Gen. XXXIX. CLIONA. — Substance fleshy, irritable, with 

 siliceous spicula ; imbedded in cavities of shells and protrud- 

 ing tubular contractile papilla?, on the margin of which 

 are placed cylindrical polypi, with 8 tentacula. 



85. C cclata. — Flesh yellow, spicula cylindrical, tubular, 

 closed, slightly curved, pointed at one end, and terminated by 

 a small hollow round head at the other. 



Grant, New Edin. Phil. Journ. — In old shells, especially oysters, com- 

 mon. 

 Perforations circular, leading into unconnected cavities, filled with the 

 fleshy matter; the tubular papillae project through the circular perforations. 



