Microscopical Society of Victoria . 
37 
series borne towards the front of the stem. Hydrotheca* set at 
an angle of about 35° ; urceolate, with an intrathecal ridge rising 
from a little below the centre of the lower side, and extending 
nearly half across its cavity, parallel with the aperture, and 
continuous with, an incomplete septum extending into the 
hydrothecal internode ; the part of the hydrotheca behind the 
intrathecal ridge not separated from the pinna ; aperture with 
four teeth on each side, the first and second from the front more 
everted than the others ; a slightly incurved tooth in front with a 
delicate, compressed, secondary tooth rising erect from it. Mesial 
sarcotheca rising from the pinna and hydro theca to nearly double 
the height of the latter, to which it is adnate up to the margin ; 
free part curved slightly forwards, the summit widened transversely, 
with the extremities curved forwards in a crescentic form; two 
orifices, lateral and terminal, and a third communicating with the 
cavity of the hydrotheca immediately below the external lateral 
aperture. Lateral sarcotheca* tubular, rising as far as the margin 
of the hydro theca, directed forwards and upwards, those at the 
distal ends of the pinna* usually much enlarged ; two orifices, 
lateral and terminal. Cauline sarcotheca* similar to the laterals, 
large, two on the stem at the base of each pinna. 
Gonangial pinna?, with ten or fifteen pairs of alternate pinnules, 
each borne on a short internode, and furnished with two lateral 
series of sarcotheca?, resembling the laterals on the hydrotheca*, 
but much larger ; sarcothccte opposite, the two proximal ones on 
the distal side of each pinnule without corresponding ones on the 
opposite side ; pinnules with obscure joints, plainer above the 
first and second sarcotheca?; two sarcotheca* on the pinna at the 
base of each pinnule. The two series of pinnules much arched 
meeting at the tips, and forming an open corbula. A single 
hydro theca on each gonangial pinna below the corbula. 
Colour, brown. Uab., Queenscliff: Kobe, S.A.? (Mr. Sineaton.) 
This species is dedicated to Professor McCoy. It does not 
usually exceed three-quarters of an inch in height, but 1 have seen 
a branched variety attaining a height of an inch and a half. 
A. plumosa. n. sp. Plate XIV, fig. 6. 
Shoots in clusters, pinnate, about an inch in height; pinme 
alternate, recurved, approximate, one on each internode. Hydro- 
