ZOOLOGICAL AND BOTANICAL ASSOCIATION. 83 



13. — C. umbonata (Bu*k). 

 Bass's Strait ; Dr. Harvey. 



14.— C. crystallina, n. *. Plate VI., Fig. 1. 



Cells subglobular, pyriform, fringed on either side by a wide hollow 

 border, spreading upwards, outwards, and slightly forwards, into large 

 lateral processes, frequently furnished with small lateral avicularia, 

 seated in cup-like depressions. 



Two arched markings, very constant in form, traverse this wide por- 

 tion of the lateral process, which is continued downwards in a hollow 

 fringe to the base of the cell 



Cell aperture large : rim slightly prominent. Vittse long and well 

 marked, sublateral, and extending nearly to the level of the lower lip. 

 Front of cell studded with elevated papillae, and whole surface orna- 

 mented with delicate diverging lines, which give the coencecium a beau- 

 tiful glistening appearance. An elevated ridge runs down the middle of 

 the back, the lateral portions falling off like the roof of a house, giving 

 the transverse section of the cell a somewhat triangular outline. Ovi- 

 cell unknown. 



Parasitical in delicate glassy tufts on Polyzoa. 



Bass's Strait ; Dr. Harvey. 



A very distinct and beautiful form. The arches in the hollow wings 

 seem to be lines along whose course the membranes of which the oppo- 

 site walls of the wings are composed are in contact. In the Vittatae 

 generally the double cell-wall is by no means so distinct as in the fen- 

 estrate group. There are, however, frequent indications that the struc- 

 ture is the same. 



The vittse seem to be rows of bead-like spaces between the layers. 



15.— C. Butkii, n. t. Plate VIII., Fig. 2. 

 Cells almost cylindrical, slightly contracted towards the truncated 

 base. Connecting horny tube very short. Superior lateral avicularian 

 processes represented by longer or shorter slightly retrocedent spines, 

 or by open lacerated cups usually bearing small avicularia at the base. 

 Spines longer in the newer cells towards the ends of the branches. 

 Cell-mouth small and round. Vittae linear, sub-lateral extending nearly 

 the whole length of the cell. Front of cell slightly tubercular. Ovicell 

 galeriform, superior; anterior surface slightly concave, bordered above by 



