282 ZOOPHYTES. 



Agaricia aspera, Schweig. Handb. 415. , Lamouroux, Exp. Meth. 57, pi. 39; 



Explanaria aspera, Lamarck, ii. 399, Encyc. 385. 



No. 4. Tridacophyllia aspera, Blain., Man. 362. 



The Explanaria gemmacea of Lamarck appears to be a gibbous variety of the aspera. 

 While part of the Ceylon specimen agrees well with Ellis's figure, another part, as de- 

 scribed above, has the characters of the gemmacea, the calicles being more or less oblique, 

 acervate, prominent, and tumid, often only a fourth of an inch in diameter, or even 

 smaller. (Lamarck, ii. 399, No. 3.) 



The Explanaria Hemprichii of Ehrenberg, from the Red Sea (op. cit. G. 1. sp. 1), 

 has many of the characters of this species, yet is probably distinct; he thus describes it: 

 " Octopollicaris, membranacea, explanata, semi-orbicularis, libera, centro affixa nee stipi- 

 tata, margine sublobata, stellis 3'" latis, tumidis, margine involute, apertura lineam, rarius 

 sesquilineam lata, cum interstitiis rudius denticulato-asperis et lamelloso-sulcatis, sulcis 

 lamellisque 12-24." "Animal tentaculis destitutum, disco laste viridi, glabro pallio 

 fusco." 



The Stephanocara Hemprichii of Ehrenberg, a Red Sea species (op. cit. G. xlvi. sp. 1), 

 may be an Echinopora, judging from the brief description given; some specimens of the 

 aspera answer nearly to his description, which is as follows : " Octopollicaris et pedalis, 

 nunc explanata, effusa, mine ramoso-fraticulosa, spinuloso-aspera, stellis tumidis, 3 lineas 

 apertis, margine parum prominulis, parum profundis ; formcB ramosce ramulis divaricatis, 

 stellato-nodosis. Animal tentaculis destitutum, fuscescens, disco acruginoso, glabro:" " la- 

 mellis cum spinularum discretarum corona media disci." 



6. ECHINOPORA HORRIDA. (Dana.} 



E. ramosa, ramis crebris, tortuosis, interdum coalitis : umbrina, tenta- 

 culis nullis sed tuberculis minimis elongatis sparsis. Corallum ramis 

 ~i" crassis, ramulis ruditer attenuatis et apice scepe laciniato-alatis ; 

 caliculis tumidis, 2'" latis, echinatis, cellis 15-18-radiatis ; interstitiis 

 vix striatis, sed spinulis scepius sparsis. 



Ramose, branches crowded, tortuous, sometimes coalescing; umber- 

 coloured, without tentacles, but with small scattered elongate tuber- 

 cles. Corallum with the branches J of an inch thick, branchlets 

 rudely attenuate and apex often laciniate and alate; calicles tumid, 

 2 lines broad, echinate ; cells 15 to 18 rayed; interstices between 

 cells scarcely striate, but mostly with scattered spines. 



Plate 17, fig. 4, corallum, natural size; 4 a, animal enlarged; 4 b, 

 transverse section, enlarged ; 4 c, enlarged cell. 



Feejee Islands. Exp. Exp. 



