HYDROID ZOOPHYTES. wAAl 
Gonosome.—The gonothecee (fig. 21, gth.) are immature and about 0°5 x 0°4 mm. 
in size. They are all female. They arise from the hydrocauli immediately below 
the hydrothece and are sessile. They are smooth, pear-shaped, and have a straight 
margin. No gonophores can be seen, the ova being embedded in the blastostyles. 
This species is also quite distinct. 
DicryocLADIUM FUSCUM. 
(Plate TIl., fig, 22. 
Locality—Cape Wadworth, Coulman Island, January 15th, 1902; 8-15 fms. 
Bottom stones. 
Hydrosome.—The single specimen of this species forms a thick, shrubby, fan- 
shaped colony, 90 mm. in height, 80 mm. in width in the widest part, and about 
25 mm. thick, i.¢., in a direction at right angles to the line of greatest width and the 
line of height. The principal branches arise irregularly from the main stem, but 
the smaller and ultimate branches are flabellate in their mode of ramification. 
The colony as a whole is rendered more compact than it otherwise would be by 
the ends of several branches developing stolons (fig. 22, sf.) which attach themselves 
to other branches around the bases of their whorls of hydrothece. At the base 
the colony is polysiphonic, but distally the branches are all monosiphonic. The 
base and hydrorhiza are missing. 
The hydrothece (fig. 22, Ath.) are arranged in six rows and almost always in 
regular verticels of three, but sometimes the three hydrothece of a verticel are not 
quite on the same plane. They are about 0°8 mm. in length and 0°3 mm. in 
diameter, and adnate for about one-half to two-thirds of their length. They are 
very slightly constricted towards the opening, the margin is quite plain and often 
suddenly everted quite close to the edge. Reduplication of the hydrothecie frequently 
occurs, but the secondary thece project very little beyond the margin of the 
primary ones. 
The soft parts are quite macerated. 
The general colour of the colony is pale brown. 
Gonosome.—Unknown. 
The species. differs from Professor Nutting’s diagnosis of the genus (19: p. 105) 
in the absence of any operculum. In the type species of the genus (D. dichotomum, 
Allman ; 3: pp. 76-77; Pl. 36, figs. 2, 2a) the anastomosing stolons coalesce with 
the mouths of the hydrothece, the cavities of the hydrothecw and stolons being 
continuous ; but in our species these stolons always grasp the hydrocauli at the base 
of the verticels of hydrothece. The species differs from both D. dichotomum of 
Allman and PD. flabellum of Nutting in the shape of the hydrothecee and in other 
characters. Unfortunately Allman does not mention whether an operculum is 
present in his species or not. 
