24 THE VOYAGE OF H.M.S. CHALLENGER. 



Turin. But, according to tlie precedence of Pourtales and Verrill, in future only the 

 species described and figured in the Coralliaires des Antilles, Supplement, p. 21, can be 

 recognised as Chrysogorgia deshonni. 



1. Chrysogorgia deshonni, Duchassaing and Michelotti. 



Clirysorjurgia ilesbonni, Duch, and Mich., Mem. Corall. des Antilles, Suppl., p. 21, pi. iv. 

 fig. 4. 

 ,, ,, Verrill, Bull. Mus. Comp. Zool., vol. xi. No. 1, p. 25, pi. ii. figs. 6, 6ff, 6/'. 



Antilles and Caribbean Sea, 88 to 163 fathoms. Off Cuba, 288 fathoms. 



2. Chrysogorgia feivkesii, Verrill. 



Chrysogorgia feickesii, Verrill, loc. cif., p. 26. 



Chrysogorgia deshonni, Pourtales, Bull. Mus. Comp. Zool., vol. i. No. 7, p. 131. 



Off St. Vincent, 573 fathoms. 



Genus 4. Riisea, Duchassaing and Michelotti. 

 Riisea panicidata, Duchassaing and Michelotti. 



Riisea paniculata, Duch. and Mich., Mem. Corall. des Antilles, p. 18, pi. ii. figs. 1, 2, 3.. 



Kolliker places this next to Verrucella} The examination of the type in the 

 Turin Museum, and of specimens from Jamaica, shows it to be closely related to 

 Dasygorgia.~\ 



Family II. I s i d ^. 



IsiJinx (pars), Milne-Edwards, Hist. Nat. des Coralliaires, vol. i. p. 192. 



Mopseadx, Acanellads, Keratoisidae, and Isidx, Gray, Cat. Lithophytes, pp. 13, 16, 18, 19. 



Isidx [pars), Studer, Monatsber. d. k. preuss. Akad. d. "Wiss. Berlin, 1878, p. 661. 



Cerafoisidse, Verrill, Bull. Mus. Comp. Zool., vol. xi. p. 9. 



Isidinx and Melithxacex {pars), Kolliker, Icones Histiol., vol. L pp. 140, 142. 



The genus Isis, as established by Linnaeus in 1737, contained an assemblage of 

 several very different generic types ; Lamarck would seem to have been the first to 

 properly define it (1801), and in 1816^ he separated the species of Melitea from those 

 of Isis proper. Lamouroux added the genus Mopsea, and united all three genera into 

 a family, Isidse (1816). This arrangement was foi-lowed by Ehrenberg, Dana, and 

 Milne-Edwards. Gray in 1870 divided his suborder Lithophyta into four groups, of 

 which the second, though . established on an eminently artificial basis, is almost the same 



1 Icones Histiol., p. 140. ^ Hist. Anim. sane Vert., t. ii. p. 298. 



