282 ZOOl'HYTOLOGY. 



From the peculiar delicacy of the walls this species would 

 afford perhaps the best subject yet met with for the study of 

 the living auimal in the cheilostome Polyzoa. 



Gen. 6. JElea, Lamx. 

 1. JE. truiicala, Bk. 



Faro. C). BicxLLAKiiD.*;, Bk. 

 Gen. 7. Buijula, Oken. 



1. B. gracilis, Bk. 



2. B. avicularia, Lk. (sp.) 



lain. ?. I'LUSTKlIhE. 



Gen. 8. Carbasea, Gray. 



1. C. ligulata, n. sp. PI. XXXI, fig. 2. 



Polyzoario phytoideo, erecto, ramoso, ramus irregularibia, ligulatis, graci- 

 libus, reriis, divaricatis ; cellulis, bi-trherialis, elovgatis, fusifvrmibus, sub- 

 cylinrlraceis, in/erne altenuatis, clausis, poro centrali lunalo, et duobut 

 minoribus simplicibus, infra orificium, ornatis, lateribus punctata, dorso 

 glabra; orijicio semicirculari, labio inferiori redo, stiperiori spinis margina- 

 libus sex munito ; ovicellulis, subglobosis erectis, superficie delicatide rvgosis. 



Polyzoarium phytoid, branched ; brandies irregular, very slender, straight, 

 divaricate ; cells bi-triserial, elongated, fusiform, sub-cylindrical, tapering 

 downwards, closed in front, with a lunate pore in the centre, and two 

 smaller, round, simple pores immediately below the orifice ; orifice semi- 

 circular, lower lip straight, upper margin furnished with six spines; ovicell 

 sub-globose, erect, finely wrinkled on the surface; cells smooth and rounded 

 behind. 



Hab. — Madeira, /. Y. J. 



This very peculiar and well-marked species is at once 

 distinguished from all its congeners by the habit of the 

 polyzoary, which is thoroughly phytoid, except that the 

 branches are all in one plane. At first sight it resembles a 

 fucus or sertularian zoophyte. On the sides of the branches 

 are frequently placed radical tubes, as in several others of 

 the Flustridae. 



Pam. S. Membbanipobidjb. 

 Gen. 9. Membranipora, Blanv. 



1. M. Rosselii, Aud. (sp.) 

 P 2. M. Lacroixii, Aud. (sp.) 



I am not quite sure that this form is rightly referred to 

 M. Lacroixii, but it so closely resembles that Mediterranean 

 species as to render their identity highly probably. Whether 

 this may be the ease or not, there can, however, be no 



