INTRODUCTION. Ixxix 
17. Genus DistTIcHoPoRa ? 
Lamarck, loc. cit., p. 197. 
This singular zoophyte appears to have more affinity to Aleyonium than to any other 
form of polypi; but the place belonging to it in a natural system of classification is as 
yet very uncertain. It is characterised by a calcareous, dendroid corallum, composed of 
long tubular cells, that present no traces of septa or tubule, and are disposed in a 
flabellate manner, so as to constitute a vertical plane, the two sides of which are 
covered with a thick and compact coenenchyma, and the edge assumes the appearance of 
a calicular groove, limited laterally by two rows of circular pores. Nothing is known 
concerning the structure of the soft parts. 
Typ. sp., Distichopora violacea, Lamarck, op. cit., p. 305. (For the structure of the Corallum, see 
Milne Edwards, Atlas du Regne Animal de Cuvier, Zooph., tab. lxxxv, fig. 4.) 
Family II. 
GORGONID &. 
Polypiers corticiferes, Lamarck, Hist. des Anim. sans Verteb. vol. ii, p. 288, 1816; Polypes corticauz, 
Cuvier, Regne Animal, vol. iv, p. 78, 1817; Corallia, Blainville, Manuel d’Actinologie, p. 501, 1834; 
Cerato-corallia, Ehrenberg, Corall. des Roth. Meeres, 1834 ; Coralliade, Gray, Synop. Brit. Mus. p. 134 ; 
Gorgoniade, Johnston, British Zooph., p. 182, 1838; Gorgonide, Dana, Exploring Expedition, Zooph., 
p- 637, 1846; Gorgoniade, Gray, List of British Anim. of the British Museum, p. 55, 1848. 
Polypi provided with a thick, suberous ccenenchyma, surrounding a central stem that 
is adherent to an extraneous body by its basis, and is formed of epidermic sclerenchyma. 
First Tribe—GORGONIN i. 
Gorgonia, Pallas, Elenchus Zoophytorum, p. 160, 1766; Cuvier, Regne Animal, Ist ed., vol. iv, p. 80; 
Lamarck, Hist. des Anim. sans Verteb., vol. ii, p. 309; Gorgonine, Dana, Exploring Expedition, Zooph., 
p- 641, 1846. 
Common axis inarticulate, horny or fasciculate, but not calcareous. 
J. Genus GoRGONIA. 
Pallas, loc. cit., (in parte.) 
Axis corneous. Calices disposed irregularly round the ramified cylinders formed by 
the ccenenchyma, and not encircled by imbricated squamme. Po/ypz retractile. 
Typ. sp., Gorgonia tuberculata, Esper. Pflanz., Gorg., tab. xxxvil. 
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