MARINE POLYZOA. 



the mouth, the enormously developed avicularium, usually only 

 on one side of the cell, and by the sculpture of the cell, which 

 appears as if it were swathed with broad tapes or bands. The 

 wide spaces left between the bands in front clearly represent the 

 true nature of the fenestrse of other species. It is the only spe- 

 cies furnished with elongated setose spines. 



7. CATENICELLA CRIBRARIA. PL V. figs. 3, 4. 



Cells subglobular, compressed, more or less alate. Avicularia 

 large, without any superior appendage, and prolonged downwards 

 into elevated lateral alae. Fenestrae numerous, small, round, 

 equidistant, the circumferential being larger than the rest : a 

 minute central crescentic pore. 



Catenicella cribraria, Busk , Voy. of Rattlesn. i. 359. 

 Hab. Bass' Strait, Hooker, 45 fathoms. Cook's Strait, New 

 Zealand, Lyall. 



Colour brown, loosely branched, and several inches high. Di- 

 stinguished readily by the cribriform aspect of the front of the 

 cell, by the curiously formed central orifice, and by the absence 

 of any superior appendage to the avicularium. 



8. CATENICELLA MARGARITACBA. PI. VI. figs. 1, 2, 3. 



Cells oval or subglobular, much compressed. Avicularia short 

 and broad, supporting a deep cuplike cavity. Fenestrae 5, large. 

 Lower margin of aperture notched in the middle ; back of cell 

 minutely sulcate ; sulci short, interrupted, irregular. 



Catenicella margaritacea, Busk, Voy. of Rattlesn. i. 356. 



Cellaria vesiculosa?, Lamk. An. s. V. ii. 190. 



Hab. Swan Island. Banks' Strait. New Zealand, Lyall. 



\ very beautiful species, the branches resembling strings of 

 minute pearls. The pearly lustre (in the dry state) owing with- 

 out doubt to the minute sulci on the backs of the cells. These 

 sulci are not, however, consequent upon the drying, because they 

 are equally apparent and constant when the specimen has been 

 immersed in fluid. The species may almost at once be distin- 

 guished by the notch in the lower margin of the mouth, and which 

 notch represents the central suboral opening present in some 

 other species. 



/3. Vittatae. Cells furnished with a narrow elongated bond or 

 " vitta " on each side. Without ftnestrcs. Ovicells galeriform, 

 not terminal. 



9. CATENICELLA FORMOSA, PL VII. figs. 1, 2. 



Cells oval. Avicularia large, flat, or cupped above. Vittae 



B 5 



