41. isis. 21 



I. polyacantha. Stony joints subeylindrical, rather elongate, of 

 unequal length, truncated at the end; the branchlets spine-like. 

 America. 



/. moniltformis (Kolliker, Ic. Hist. p. 140). Stony joints very 

 short, swollen in tiie middle, forming a bead-like stem (Esper, t. 2 ; 

 Seba, iii. t. 110. f. 2). India. B.M. 



/. coralloides (Larnk.). Stony joints very short, shorter than the 

 horny joints, rose-coloured; branches very slender. Pacific Ocean. 

 This I have not seen. 



Var. cymosaria. The branches forming a cyme. 



Cymosaire, Lamk. Mem. Mm. i. p. 467. 



Isis hippuris, var., Lamk. Hist. A. s. V. ii. p. 303. 



99. Isis hippuris. B.M. 



Slightly branched ; bark smooth, thick, osculiferous ; joints of axis 

 grooved, irregular, upper compressed ; joints of the branches longer 

 than those of the branchlets. 



Corallium articulatum, Imperat. Ital. p. G28 ; Aldrov. Mus. Metal. 



p. 289 ; Loch. Mm. Besler. t. 23. 

 Hippuris saxea, Clus. Exot. p. 124 ; Olear. Mus. p. 69, t. 35. f. 4 ; 



Valent. 2nd, Lit. p. 504, t. 8. f. 2, 3, 4. 

 Pseudocorallium croceum, Boccone, Obs. Gall. p. 34, t. 

 Accabaarium album, Rumph, Amb. p. 6, t. 84 ; Valent. Ind. iii. t. 52. 



f. A. 

 Lithophyton articulatum, Gualt. Lid. t. 7 ; Seba, Thes. iii. t. 105. f. 3, 



t. 110. f. 1, 2; Knorr, Delic. t. A 1. f. 6. 

 Sertularia ramosissima, Linn. Hort. Cliff, p. 480. 

 Isis hippuris, Linn. S. N. ed. 12, t. 287 ; Pallas, Zooph. p. 233 ; Eper, 



i. t. 1, 2, 3, 3 a ; Solander $ Ellis, Zooph. p. 105, t. 3. f. 1-5 (with 



bark) ; Lamk. Syst. A. s. V. p. 378 ; Gray, P. Z. S. 1857, p. 283 ; 



Kolliker, Ic. Hist. p. 140, t. 19. f. 42, 43, t. 16. f. 4. 



100. Isis flexibilis. 



Irregularly branching, subflabellate ; branches very long and 

 slender ; calcareous joints cylindrical, nearly smooth, or with a few 

 faint striae, about four times as long as the corneous ones in the 

 thicker branches, but proportionally much longer in the branchlets. 

 Polypes rather thickly set, generally alternate, short, campanulate, 

 armed with short spines. The thickest stems about -^ inch 

 in diameter, the branchlets not much thicker than horse-hair. The 

 main stems were not obtained. Colour dark brown, from a thin 

 coenenchyma covering the younger branches. 



Isis flexibilis, Pourtales, Bull. Mus. Comp. Zool. 1868, p. 132. 



Obs. In a few instances the branches appear to arise from the 

 corneous joints. 



Hab. In 324 fathoms, off the Florida Reef. 



