INTRODUCTION. Ixxxi 
8. Genus SOLANDERIA. 
Duchassaing and Michelin, in Guerin’s Revue Zoologique, June, 1846. 
Differs from Gorgonia by the suberous texture of the sclerobasal axis, which resembles 
the non-calcified jomts of Melitza. 
Typ. sp., Solanderia gracilis, Duchassaing and Michelin, loc. cit. 
9. Genus BRIAREUM. 
Blainville, Manuel d’Actinologie, p. 520, 1830. 
Axis soft, suberous, or composed of spicula. This genus is intermediate between 
Alcyonium and Gorgonia. 
Typ. sp., Briareum gorgonoideum, Blainy. ; Gorgonia briareus, Lin. ; Ellis and Solander, tab. xiv, figs. 1, 2. 
The genus Hyatonrema established by M. Gray, (‘ Proceed. of the Zool. Soc.’ 1835, 
p- 63,) is also referred by some zoologists to the tribe of Gorgonine; but the recent 
observations of M. Valenciennes tend to establish that the fasciculi of siliceous threads, 
which constitute the axis of this singular production, belong to the class of Spongide, and 
the polypi which we have observed in a dried state on different parts of the axis appear to 
be parasites, belonging to the order of Zoantharia. 
Second Tribe—ISIN A. 
Dana, Exploring Exped., Zooph., p. 677, 1846. 
Common axis articulated, or composed of segments, the structure of which differ 
alternately. 
10. Genus Isis. 
Linnzeus, Syst. Nat., 12th ed., p. 1287, 1767. 
Axal sclerobasis composed of joints, alternately corneous and calcareous ; branches 
proceeding from the calcareous joints. 
Typ. sp., Ists hippuris, Lin., loc. cit. 
11. Genus MopsEa. 
Lamouroux, Polyp. Flex., p. 466, 1816. 
Axis presenting the same structure as in the preceding genus, but with the branches 
proceeding from the corneous joints. 
Typ. sp., Mopsea dichotoma, Lamouroux, loc. cit., p. 467. Fa 
