REPORT ON THE POLYZOA, 
183 
2. Adeonella, n. gen, 
Eschcira (pars), Auctt. 
Character. — Zoarium erect, very variously branched or lobate, attached by a con- 
tracted base, or pedicle, often containing radical fibres and affixed usually on a more or 
less flexible support. 
It is extremely difficult to point out any very definite line of distinction between 
some of the forms included under this subgenus and some of the non-fenestrate species 
placed under Adeona, as for instance Adeona foliifera, Lamarck, or Adeona intermedia , 
Kirchenpauer, The main difference consists in the absence in all cases of a jointed 
flexible stem, which again may or may not be present in one and the same species of 
the fenestrate kind as is the case in the species I propose to name Adeona gattyce. But 
it is curious to observe that the want of flexibility in the peduncle itself is, in all instances 
that have come under my notice, supplied by the support itself being flexible, such as 
some hyclroid growth, or fibre of Gorgonia, or Antipathes, a Fucus, sponge, &c. 
As regards the general zooecial characters, there is no difference whatever between 
Adeona and Adeonella, and in one respect the zoaria of the two resemble each other, 
for in many cases among the Adeonellce there is a distinct midrib on the main stem and 
lobes, of precisely the same nature as the peculiar raised veins or ridges seen in most 
of the Adeonce. 
(1) Adeonella polymorpha, n. sp. (PI. XXI. figs, la, 2a, 3, 3a, not figs. 1 and 2). 
Character. — Zoarium 3 or 4 inches high, very thin, alternately pinnate like mail} 1 * * * * * 7 
ferns, with very strongly marked midribs. Zooecial cells diversiform ; when young, ovate 
or pyriform, convex or subcarinate in front with 
one or two longitudinal rows of punc-ta on the 
sides ; when mature hexagonal and hollowed in 
front, the surface entire or very indistinctly 
punctured ; a large circular simple pore, which 
in the young cell is formed immediately below 
the orifice by the constricting of the notch in the 
lower border, and thence gradually descends so as 
to become nearly central. Usually one or more 
small avicularia on the front, irregularly placed. 
The primary orifice suborbicular and emar- 
ginate, or dithridiatc ; in the mature cells, orbicular or elliptical with a thin peristome. 
Ooecial cells, larger, broadly ovate, and convex in front, the surface thickly punctured all 
