84 Rev. 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. AlcyonidaB. 

 Genus Rhizoxenia (Ehrenberg). 

 Rhizoxenia albicolor, n. sp. PI. X. fig. 1. 

 R. albescens ; basi communi sive interstitiis cellularum polypiferarum 

 convexarum latitudinis fere dimidium baud attingentibus, longitu- 

 dine plerumque vix sequantibus 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, pi. 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 Sarcodidyon. 



Class POLYZOA. 



Fam. Membraniporidse. 



Genus Lepralia, Johnston. 



Lepralia venusta, n. sp. PI. X. figs. 3 & 3. 



L. cellulis ovatis, convexis, umbone Isevi magno conspicuo in 

 medio infra orificium site instructis ; superficie perforata ; orificio 

 orbiculari inferne sinuate ; 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 



