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F, CANU. — REVISION DES BRYOZOAIRES 



23 Avril 



G. Heterœcium Hincks 1891. 



Zoecia pyriform, apertuix large, occuping about two thirds of the 

 front, closed in by amembranous covering and furnished mth marginal 

 spines {calcareous) : immediately below the aperture a tall articulated 

 spine. Oecium borne ou gigantic cells, whicli are elongate and of 

 considérable width, cxtending over almost the whole of the aperture, 

 whichis covered by a roof compose d of rib-Uke processes springing from 

 the opposite sides of the cell-wall, and bending slightly inward so as to 

 meet in the centre, where their extremities are soldered together, whilst 

 they are united laterally by a calcareous expansion, the oral arch poin- 

 ted ; ovicelligerous cells placed between the divergent Unes of zoecia at 

 a bifurcation. » (Hincks). — Ovicelle costulé placé dans l'area de zoécies 

 plus grandes. Actuel. 



Type : Membranipora amplectens (Hincks) (Fig. 23). 



G. Nellia Gray. 



(( Zoarium erect, articulated, branched. Zoecia quadriserial front 

 flat or convex at the bottom, with raised margins and large aperture, 

 filled in by a membrane » (M. G.) Zoarium articulé. Actuel. 



Type : Nellia oculata (Busck). 



G. Pyripora d'Orb. 1847. 



Vibracellaires. L'accroissement ectocystalse fait par zones successives 

 et concentriques. Cénomauien. Actuel. 

 Type : Membranipora catenularia Jameson. (Fig. 24). 



Yiu- 24 — Pyripora d'Orb. —Type: P. caLenularia (Jamobou) (d'après Hincks). 



Autres espèces: Membranipora pulita {ninckb), eb urnea [Eiacks) , 

 Cupularia Houzeaui (Pergeus et Meuuier), etc. 



