6 
THE VOYAGE OF H.M.S. CHALLENGER. 
acute, tapering spine. The internocles comprise from seven to eleven zooecia. usually 
seven or nine, and the branches always arise from the second. Zooecia about half connate, 
produced above and curved abruptly forwards ; aperture circular, even, border thin. 
Surface sparsely punctate ; dorsal aspect finely striated, with a row of punctures down 
each interspace. Branches convex before and behind, and without any intermediate 
longitudinal space. Joints white or pale brown. Ooecial cells ? Branches 0'2 to 0’25 mm., 
zooecia OT mm. wide. 
Habitat. — Station 320, lat. 37° 17' S., long. 53° 52' W., 600 fathoms, green 
sand. 
Somewhat like Crisia denticulata, but differing in the general habit which is 
characterised by the very long, straggling, wavy, or flexuose, sparingly forked branches, 
terminating in two or three short forks. Many of the ultimate segments exhibit a longer 
or shorter, acutely tapering, pointed spine, formed of a metamorphosed zooecium. A 
similar disposition may be occasionally seen in a species of Crisia, to which I have given 
the name of Crisia sinclairensis (Brit. Mus. Cat., pt. iii. p. 6, pi. iv. figs. 7-11), but in 
this species the spinous process thus formed is much more obtuse, and there are other 
differences which prevent their being considered the same. 
(6) Crisia acropora, Busk. 
Crisia acropora, Bk., Voy. of Rattles., vol. i. p. 351; Brit. Mus. Cat., pt. iii. p. 6, pi. v. figs. 3-4; 
Macgilliv., loc. cit., Dec. iv. p. 38, pi. xxxix. fig. 3. 
Character.-— Cells nine to thirteen in each internode; a conical tooth (sometimes 
bifid) behind the orifice. Zooecia slightly compressed ; surface closely punctured, brilliant, 
sometimes porcellanous. Branches arising from the second to the fourth zooecium. 
Ooecial cells large, pyriform, frequently annulated. Branches 0‘25 mm., and zooecia about 
0‘06 mm. wide. 
Habitat. — Station 161, off Port Philip, 33 fathoms, sand. 
[Bass Strait, R.; Williamstown and Queenscliff, Macgilliv.] 
In this species the radical tubes are much curled, always arising from the bottom of 
the lowest cell in an internode, behind. 
(7) Crisia holdsworthii, Busk (PI. III. fig. 2, ooecium). 
Crisia holdsworthii, Busk, Brit. Mus. Cat., pt. iii. p. 7, pi. vi.B fig. 2. 
Character.— Zooecia nine to eleven in each internode, connate throughout, with a 
short, tubular, cylindrical prolongation projecting directly forwards; walls very delicate, 
sparsely punctured ; branches arising usually from the third, but in the lower internodes 
