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



Turin. But, according to the 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 Chri/sogorgia deshonni. 



1. Chri/sogojyia deshonni, Duchassaing and Miclielotti. 



Chn/fuxjmyia (Ifishmni, Ducb. an'l Midi., Mem. Corall. des Autilles, Suppl., p. 21, pi. iv. 

 fig. 4. 

 „ „ YeiTill, Bull. Mus. Comp. Zotil, vol. xi. No. 1, p. 25, pi. ii. fig.s. C, Qa, 6/-. 



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



2. Clirysogorgia fewkesii, Verrill. 



Chrysogorgia fewliesii, Verrill, loc. cit., p. 26. 



CJiri/.?nr/orf/ia deshonni, Pourtales, Bull. Mus. Comp. Zoul., vol. i. No. 7, p. 131. 



Off St. Vincent, 573 fathoms. 



Genus 4. R'tisea, Duchassaing and Michelotti. 

 Riisea j^anicidata, Duchassaing and Michelotti. 



Biifea 2M7iu-uIafa, Duch. and Mich., Mem. Corall. des Antilles, p. 18, pi. ii. figs. 1, 2, 3. 



KoUikor places this next to Verrucella} The examination of the tj\)Q in the 

 Turin Museum, and of specimens from Jamaica, shows it to ]:)e closely related to 

 Dasygorgia.^ 



Family II. I s i d .-e. 



Igidinee (j'lari)), Milne-Edwards, Hist. Nat. des Coralliaires, vol. i. p. 192. 



Mopseadee, Acanelladx, Kemtuiaidx, and hidse. Gray, Cat. Lithophytes, pp. 13, 16, IS, 19. 



Iddse {pars), Studer, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, 1878, p. 661. 



Ceratoisida', Verrill, Bull. Mus. Comp. Zool., vol. xi. p. 9. 



Mdinse and Melitliscacex {pars), Kolliker, Icones Histiol., vol. i. pp. 140, 142. 



The genus Isis, as established by Linnasus 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, Isida3 (1816). This arrangement was followed by Ehrenberg, Dana, and 

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

 which the second, though estal)lished on an eminently artificial basis, is almost the same 



' Icones Histiol., p. 140. - Hi^t. Anim. sans Vert., t. ii. p. 298. 



