84 CLASS II. 
T. xxvi.) The species are very numerous, and many might perhaps 
by closer investigation be better defined. Lamovroux and EHREN- 
BERG have formed different genera, which by the last especially have 
been distinguished by the arrangement of the Polyps. 
Subgenera: Prymnoa Lamour., Exrens. Mwricea Lamour., 
Exrens. Hunicea Lamour. Enrens. Plewawra Lamour., EHRENB., 
Gorgonia Lamour., EnRensB., Pterogorgia EnreNB.—A new genus 
Bebryce Puiuitept appears to be distinguished by non-retractile 
Polyps. 
Sp. Gorgonia flabellum L., Eu. Corall, Pl. xvi. fig. A—O. Sea-fan, Mermaid’s 
fan, in different seas. 
Antipathes Pau. (Gorgonie Spec. L.) Stem with axis horny, 
distinct, covered usually with minute spines, with bark polypiferous, 
gelatinous, deciduous. 
Sea-shrub. The bark which is gelatinous, not calcareous or 
fibrous, is missing in specimens taken from the sea: hence, when 
preserved in collections, they resemble branches of dead wood. 
EHRENBERG thinks Antipathes ought not to be joined to Gorgonia, 
and that it probably belongs to the ryozoa. He refers to later 
communications, which have not yet, as far as I know, been pub- 
lished. (Die Corallenthiere des rothen Meeres, s. 113 in a note.) 
Mitne Epwarps does not hold this opinion, Lamarck Hist. nat. 
des Ani. s. v. 1. p. 684. According to Gray the Polyps of Anti- 
pathes, which he investigated in a specimen referred by him to 
Ant. dichotoma Pati. have siz arms, but, with the exception of 
this strange anomaly, agree with those of Gorgonia. Proceedings of 
the Zool. Soc. of London. 1832. p. 41, 42. 
Sp. Antipathes spiralis Paut., Esper Pflanzenth. Antip. Tab. VIL, PALLAS 
Plantdieren by BoppaErt, Tab. vi. fig. 5.— Antipath. myriophylla Paut., 
Esper 1. 1. Tab. x, GuERIN Iconogr. Zoophyt. Pl. xxii. fig. 1. &e. 
Orper III. 
Polyactinia (Zoocorallia polyactinia, Phytocorallia polyactinia, 
and Phytocorallia dodecactinia EHRENBERG). 
Polyps with twelve or more non-pinnate tentacles, simple or 
ageregate. Nutrient canal suspended in the cavity of the body, by 
means of lamelle forming partitions. Aperture of the nutrient 
canal single, external, supplying the office of mouth and of anus. 
