ZOOLOGICAL AND BOTANICAL ASSOCIATION. 81 



Algae. Old specimens have often lost their large ascending processes, 

 which gives them a very different appearance. 



Bass's Strait ; Dr. Harvey. Port Fairy ; J. Dawson, Esq. 



6. — C. plagiostoma (Busk). 

 Bass's Strait ; Dr. Harvey. On Fucoids, abundant and fine. 



7. — C. margaritacea (Busk). 

 Bass's Strait ; Dr. Harvey. Port Fairy ; James Dawson, Esq. New 

 Zealand; Dr. Joliffe. 



/3. — Catenictllm Fascials ( JTyv. T.). 



S.—C. Harveyiy n. s. Plate VII., Figs. 1, 2. 



Ccencecium forming loose, handsome, curling, brown tufts. Cells 

 large, purely horny, vase-shaped ; expanded superiorly by moderately 

 large lateral processes, usually bearing large sublateral avicularia. Ex- 

 ternal membrane thin, loosely investing the inner; and raised into conical 

 papillae on the front of the cell. Inner membrane strengthened by a 

 raised strap of chitine, continuous with the thickened rim of the cell- 

 mouth, dividing immediately below the lower lip, and forming a ring, 

 again uniting and passing down the middle of the front of its cell to its 

 base ; and by similar straps spreading, apparently irregularly, over the 

 avicularian processes, and over the back of the cell. Ovicell calyptri- 

 form ; sessile by a broad base in the position of one of the avicularian 

 processes of a cell, which it replaces. Back of ovicell furnished with a 

 very large sessile avicularium. 



Bass's Strait; Dr. Harvey. A single tuft. This is a remarkable 

 and most distinct species. The cells are nearly as large as, and resem- 

 ble in form, those of C. amphora. 



The cell walls are very evidently formed of two membranes, which 

 remain distinct. 



In dried specimens the inner and stronger coat retains its form, 

 while the outer appears to invest it in loose, wrinkled folds, expanding 

 into an irregular projecting frill round the mouth. When the ccence- 

 cium is boiled, to expel the air and expand the tissues, the water passes 

 freely between the two layers, raising the outer wall into distinct pa- 

 pillae, and showing it loosely hung round the cell. 



ZOOL.& BOT. SOC. PKOC VOL. I. M 



