32 
Journal of the 
a strong intrathecal ridge proceeding from the middle of the front 
of the cell obliquely downwards to its centre; aperture with 
three everted teeth on each side, a broad, rounded tooth or lobe 
behind, and usually a minute tooth in front; a group of several 
minute denticles within the front of the cell near the base, 
directed upwards, and a similar group a little above, pointing 
downwards. Mesial sarcotheca stout, rising from the pinna, 
about twice the height of the hydrotheca, to which it is adnate up 
to the margin, upper part curved and generally produced forwards 
parallel with the pinna, with terminal and lateral apertures, the 
latter sub-tubular. Lateral sarcothecse short and broad, with two 
sub-tubular orifices, one directed forwards, the other upwards ; 
front margin completely free, forming a wide aperture. Cauline 
sarcotheca? similar to the laterals, two on the stem at the base of 
each pinna. 
Gonothecce ? Colour, brown. Hab. Griffiths* Point (Mr. Gold¬ 
stein). 
The anterior sarcothecse are generally produced as in the next 
species, but not quite to the same extent. Those resembling the 
figure are mostly found near the ends of the pinna, the transition 
being gradual. The teeth of the calycle vary somewhat in size 
and relative position. 
A. ascidioides. n. sp. Plate XIII, fig. 5. 
Shoots from one inch and a half to two inches in height, pinnate • 
pinnse close, opposite, straight, ascending, a pair to each internode. 
Hydro thecae set at an angle of about 60°, a strong intrathecal 
ridge proceeding from the middle of the front of the cell obliquely 
downwards to its centre; aperture with two everted teeth on each 
side, a small incurved one in front, and a long upright one behind • 
a group of several minute denticles within the front of the cell 
near the base, directed upwards, and a similar group a little above, 
pointing downwards. Mesial sarcotheca stout, rising from the 
pinna, adnate to the hydrotheca up to its margin, rising consider¬ 
ably above it, and then continued forward parallel with the pinna 
till it nearly reaches the next sarcotheca in front; slightly 
tapering, with terminal and lateral apertures, the latter sub¬ 
tubular. Lateral sarcothecse short and broad, with two sub¬ 
tubular orifices, one directed downwards, at right angles to the 
