INTRODUCTION, Ixxv 
Family I. 
ALCYONID i. 
Polypi adherent and not provided with an epidermic sclerenchyma. 
In this family, the dermic tissue is usually consolidated by a great number of scleren- 
chymous spicula imbedded in its substance, and constitutes sometimes a tubular corallum, 
but there is never any trace of a central stem or axis, like that which is constituted by the 
sclerobasis in Gorgonide and in most of the Pennatulidee. 
First Tribe—CORNULARIN i. 
Polypi simple or segregate, and produced by gemmation on creeping stolons, or basal 
membranaceous expansions, and having no lateral buds or connecting appendices. 
1. Genus CoRNULARIA. 
Lamarck, Hist. des An. sans Vert., vol. 11, p. 111, 1816. 
Polypi rising by gemmation from creeping filiform stolons, and provided with a tough 
or subcorneous tubiform polypidom, the surface of which is not costulated. 
Typ. sp., Cornularia cornucopia, Cuvier ; Tubularia cornucopia, Cayolini, Mem. per Servire alla Storia 
de Polipi Marini, tab. ix, figs. 11, 12; Cornularia rugosa, Lamarck, loc. cit. 
2. Genus CLAVULARIA. 
Quoy and Gaimard, ap. Blainville, Dict. des Se. Nat., vol. lx, p. 499, 1830; Actinantha, Lesson, Zool. 
de la Coquille, Zooph., p. 89, 1831. 
Polypi resembling Cornularia, but having their tubular polypidoms costulated and 
incrustated with long spicula. 
Typ. sp., Clavularia viridis, Quoy and Gaim., Voyage de lAstrolabe, Zooph., tab. xxi, fig. 10. 
3. Genus RHIZOXENIA. 
Ehrenberg, Corall. Roth. Meer., p. 55, 1834. 
Polypi resembling those of the preceding genus, but not retractile. 
Typ. sp., Rhizovenia thalassantha, Ebr. ; Zoantha thalassantha, Lesson, Voyage de la Coquille, Zooph., 
tab. i, fig. 2. 
