84, Rey. A. M. Norman on undescribed 
attached to the perpendicular sides of this cavern, about a foot 
beneath the water at the lowest spring-tide. Other, but much 
smaller specimens were inhabiting a rock-pool just outside the 
cave. These last examples, though not more than an inch or an 
inch and a half high, were loaded with reproductive bodies, 
which, however, were wholly absent from their larger brethren 
in the cave. 
Class ACTINOZOA. 
Fam. Alcyonide. 
Genus Rurizoxentra (Ehrenberg). 
Rhizoxenia albicolor, n.sp. Pl. X. fig. 1. 
R. albescens ; basi communi sive interstitiis cellularum polypiferarum 
convexarum latitudinis fere dimidium haud attingentibus, longitu- 
dine plerumque vix zequantibus rarissimeque superantibus cellu- 
larum diametrum. 
Mare prope insulam Jersey habitat. 
This species is at once distinguished from R. catenata (Forbes) 
by its colour, which is white. The polyps are placed very closely 
together ; their diameter is half as great again as that of the 
connecting creeping base, and the distance from polyp to polyp 
is generally less than the diameter of the polyp itself. 
In these respects the present form differs widely from a white 
species which has previously been described by Sars under the 
name of Rhizoxenia filiformis (Sars, Faun. Litt. Norveg., sec. 
livr. p. 65, pl. 10. figs. 13-17). 
R. albicolor was found creeping over a stone dredged off 
Gorey, in Jersey, in 1859. 
The genus Rhizoxenia was established by Ehrenberg, in his 
‘Corallenthiere des rothen Meeres,’ Berlin, 1834, p.55, and 
thus has precedence of Forbes’s genus Sarcodictyon. 
Class POLYZOA. 
Fam. Membraniporide. 
Genus Lepratia, Johnston. 
Lepralia venusta, nu. sp. Pl. X. figs. 2 & 3. 
L. cellulis ovatis, convexis, umbone levi magno conspicuo in 
medio infra orificium sito instructis ; superficie perforata ; orificio 
orbiculari inferne sinuato ; peristomate simplici, inermi ; ovicellula 
galeata, punctata, avicularium parvum in summo sustinente. 
Cells ovate, somewhat elongated, convex, irregularly disposed, 
having a large and prominent smooth umbo placed a little below 
the mouth ; surface elsewhere perforated. Mouth nearly circular, 
but having a wide shallow sinus on the under lip. No spines on | 
