IDMONEID&. 197 
a raised, slightly thickened, annular border, which is sometimes pro- 
duced into an acute angle on one side; a pore above and below the 
mouth ; anterior surface marked with smooth reticulated ridges, form- 
ing nearly regular diamond-shaped areolz ; posterior surface sulcate, 
the sulci usually diverging obliquely from an imaginary median line, and 
finely punctate ; surface between the sulci smooth or sub-granular. 
Genus, RETIHORNERA—Kinchenpaur. 
Zoarium foliaceous, composed of sub-parallel branches connected by 
transverse tubules, so as to form an expanded frond with quadrangular 
fenestra. 
R. foliacea, J/Gillivray ; Busk, lc., p.19, pl. xiii, fr 1, 23 
R. sguamosa, Hutton, CM.M., p. to1. Foliaceous, waved, in- 
fundibuliform, reticulated; mouths of the cells sub-orbicula, with a 
raised and scarcely thickened margin ; interspaces finely granulated and 
with slightly raised, scaly, longitudinal lines ; back finely granulated, 
with slightly raised rather scaly lines; fenestrae small; branches com- 
pressed ; white or pale brown. 
Chatham Islands. Australia. 
R. gouldiana, Busk, Crag Polyzoa, ~p. 95. Foliaceous, infundi- 
buliform, waved, reticulated ; mouths of the cells sub-orbicular, with a 
slightly raised and thickened margin ; interspaces coarsely granulated ; 
back finely granulated and lightly striated ; fenestrae small; branches 
cylindrical ; white. 
Chatham Islands. Australia. 
Perhaps identical with the last species, but the cells are nearer 
together. 
Genus, PUSTULIPORA—-Blainville. 
Zoarium ramose, branches cylindrical, clavate or terete ; composed 
of tubular cells, which open on all sides of the branch. 
P. parasitica, Busk, loc. cit., p. 21. p. xvii, f 1-2. Zoarium 
about a quarter inch high, usually formed of one to three branches, 
short and truncate; cells, usually deeply immersed, and very slightly 
prominent, except in very young specimens ; colour, brown, with white 
spots. 
Bass Straits. 
Always parasitic upon a species of Catenzcella. 
P. haastiana, Svolicska, Reise d. Novara, Pale., p. 102, pl. xvii., 
f. 4-5. Branches erect, close, asastomosing, in thick masses with the 
ends truncated to the same spherical surface ; sub-cylindrical ; cells dis- 
‘tant, marked with longitudinal lines; mouth slightly prominent, re- 
curved, sub-orbicula, margin thickened ; white. 
Common. 
