262 



THE VOYAGE OF H.M.S. CHALLENGER. 



Subgenus Carijoa, F. Miiller, 1867 {Alexella, Gray, 1869). 



The axial polyps are very large, and differ greatly from the minute lateral polyps. 

 The walls of the axial polyps are thick, and contain a horny substance, which surrounds 

 the spicules and binds them together. The spicules are rod-like, with few spines. The 

 colonies form usually tall, 6ror^on{a-like, ramified masses. 



Species : — 



Telesto {Carijoa) srnithii, Gray. 



,, ,, ru'sei, Duch. et Mich. 



„ ,, prolifera, v. Koch. 



Telesto {Carijoa) rrqncola, F. Miill. 

 ,, ,, arborea, n. sp. 



,, „ trichostemma (Dana). 



Telesto {Carijoa) rupicola, F. Miiller. 



Carijoa rujncola, F. Miiller, Arch. f. Naturgesch., .Jahrg. xxxiii. Bd. i. p. 330 Anm., pi. ix. 



figs. 56, .57, 1867. 



A colony found at Bahia, at a depth of 10 to 20 fathoms, agrees in every particular 

 with the excellent description and figure given by F. Miiller, so that there can be no 

 doubt as to the identity of the two forms. 



When the colony grows over a level surface, the flattened stolons form a delicate 

 network, from the connecting portions of which the long axial poljrps arise. In some 

 places the stolons anastomose laterally, and thus form more or less broad plates, which 

 again divide at their edges into isolated stolons. The axial polyps may be 120 mm. 

 high. 



The spicules, which in form and size correspond with the description given by Fritz 

 Miiller, lie close together, but with no definite regularity, in the wall of the calyx ; they 

 are bound together, though this seems to have escaped Miiller's notice, by a mesh of 

 horny substance. 



The colour in spirit is whitish. According to Miiller it is yellow or reddish during 

 life. The retractile portion of the polyps, and the crown of tentacles, are snow-white. 



Habitat. — Bahia; depth, 10 to 20 fathoms. 



Fritz Miiller found the species also on the coast of Brazil. 



Telesto {Carijoa) arborea, n. sp. (PL XXXIX. figs. 1, la). 



This species forms ramified masses which rise from a level base to a height of 200 mm. 

 The axial polyps bear others of the second order which attain considerable length, some- 

 times even 150 mm., but these seldom bear axial nnlyps of the third order. The lateral 



