140 
PBOCEEDIXGS OF SOCIETIES. 
It is galeate, tubereulate, sessile on the apex of one of the cells of a ge¬ 
minate pair. 
8. —Cateniciellae simplices {Bush). 
17.— G . ca/rinata (Bush). 
Hew Zealand ; Dr. Joliffe. 
e.—C atenicell^j aueit^j (Wyv. T.) 
18.— C. aurita (Bush). 
Bass’s Strait and Fremantle; Dr. Harvey. Port Fairy; J. Dawson, 
Esq. Hew Zealand ; Dr. Joliffe. 
Fine specimens have the front richly tuberculated. Three or four 
tubercles below the mouth are perforate; but there is no approach to 
the true fenestrate character. 
19 _ C. geminata, n. s. Plate X., Fig. 3, 4. 
Axial cell geminate. The secondary cell developed alternately on 
either side of the axis. Axial cells pyriform; a large gaping avicularium 
on the angle opposite the secondary cell. Secondary cell giving off by 
a terminal homy tube a single wedge-shaped peripheral cell. Cell-mouth 
large; a deep notch in the centre of the lower lip. In the primary and 
secondary axial cells four or five blunt spines surround the upper margin 
of the mouth, which is surmounted in the peripheral cells by two longer 
ear-like processes. Front of cell tuberculated. Ovicell unknown. 
A small species, apparently generally distributed in the Australian 
seas. Epiphytic on red Algse. 
Bass’s Strait and Fremantle; Dr. Harvey. Port Fairy; Mr. Dawson. 
Hew Zealand; Mr. Joliffe. 
Had it not been for its close resemblance to C. aurita (Bush), evi¬ 
dently a true Catenicelia, and with which it often grows associated, one 
might have almost been inclined to consider this curious little form 
the type of a new generic group, or an aberrant species of the genus 
Calpidium. As in Calpidium, the cells have two “key-holes;” but a 
single glance must satisfy us that the cell consists of a primary and a 
secondary chamber, bearing the same relation to one another that the 
two cells of a geminate cell bear at a bifurcation in any of the other spe¬ 
cies of the genus. C. geminata bifurcates at every cell, so that all the 
axial cells are geminate. The septum between the cells is traced on the 
back of the cell by a deep groove in the usual position. The back of the 
primary cell, both in this species and in C. aurita, is frequently perfo¬ 
rated to give origin to a horny, tubular tendril. The secondary cell 
sometimes gives off a secondary axis, but more usually only a single 
wedge-shaped cell, apparently partially abortive. The coencecium is 
very calcareous, and becomes very thick with age, a calcareous deposit 
obliterating all the markings. The horny connecting tubes between the 
cells are unusually long. 
