654 



Haddon and Shackleton — A Revision of the British Actinice. 



SYNOPSIS OP BEITISH SPECIES OF PAEAZOANTHUS. 



(external chaeaotees.) 



Coenencliyme thin, band-like, or inconsiderable ; capitular ridges about 18, 



prominent, granulated, ....... P. anguicoma. 



Ccenenchyme thick, soft, expanded ; capitular ridges about 21 ; not so prominent 



as in former, ........ P. dixoni. 



(ANATOlVnOAL OHABAOTEES.) 



Mesenteries project only a short distance from the body-wall into the coelenteron ; 



endoderm of moderate thickness, uniform ; incrustations numerous, . P. anguicoma. 



Mesenteries project a considerable distance from the body-wall into the coelen- 

 teron ; endoderm forming very thick ridges between every two mesenteries ; 

 incrustations few, ........ P. dixoni. 



The following species is inserted for comparison with the above : — 



Ccenenchyme thin, band-like or irregular expansions ; capitular ridges 13-15, not \ 



very prominent, . . . . . . . . \ P. axineUcB 



Mesenteries much as in P. anguicoma ; endoderm very thin and uniform ; incrus- [ (Mediterranean), 



tations not very numerous, chiefly spicular, . . . . j 



Farazoauthus axinellse (Schmidt). 

 Type species. — (Not British.) 

 (PI. Lix., fig. 8; PL Lx., figs. 6, 7.) 



Palythoa axinella : 



Schmidt, 1862, Spongien des Adriatischen Meeres, p. 61, pi. vi., figs. 2, 3. Gray, 1867, Proc. 

 Zool. Soc, p. 238. Heller, 1868, Ber. k. zool., hot., Gesellseh., Wien, p. 21. Jourdan, 1880, 

 Ann. des. Sci. Nat. (6), x., p. 43. Miiller, 1883, Morphologic Palythoa u. Zoanthus, p. 8. 

 Carus, 1884, Prod. Faunaj Medit., p. 76. 

 Zoanthus axinella : 



Koch, 1880, Morph. Jahrb., vi., p. 359, pi. svi., figs. 1-6. 

 Polythoa (str. s.) axinellce : 



Andres, 1884, Le Attinie, p. 311, pi. x., fig. 7. 



Form. — Polyps obconical, coated with foreign particles ; capitular ridges, 

 13-15, not very distinct. Tentacles, 26—30 ; pointed with a very slight 



