DUBLIN UNIVERSITY ZOOLOGICAL AND BOTANICAL ASSOCIATION. 139 
13.— C. umbonata {Bush). 
Bass’s Strait; Dr. Harvey. 
14.— C. crystallina, n.s. Plate XIII., Pig. 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. Yittae long and well 
marked, sublateral, and extending nearly to the level of the lower lip. 
Pront of cell studded with elevated papillae, and whole surface orna¬ 
mented with delicate diverging lines, which give the coenoecium 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 Yittatae 
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 vittae seem to be rows of bead-like spaces between the layers. 
15.— C. Buskii, n. s. Plate XI., Pig. 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. Yittae linear, sub-lateral extending nearly 
the whole length of the cell. Pront of cell slightly tubercular. Ovicell 
galeriform, superior; anterior surface slightly concave, bordered above by 
a projecting crescentic beaded rim; posterior surface convex, encroach¬ 
ing on the cavity of the next cell, against which it is cemented, and 
which is sessile on the ovicelligerous cell. 
Probably allied in habit to C. taurina {Busk), as its resemblance to 
Thuiaria thuia is remarkable. Coenoecium very calcareous. 
Bass’s Strait; abundant; Dr. Harvey. 
16.— C. perforata {Busk). 
Bass’s Strait; abundant; Dr. Harvey. 
The ovicell of this pretty species resembles that of C. taurina {Busk). 
