CLADOCARPUS. 49 
had been developed in the specimens obtained, which were possibly ex- 
amples of young individuals; but though the entire colony might increase 
in size with age, it is not probable that older specimens would present 
any important change of form. 
In the absence of a gonosome the reference of the species to Aglaophenia 
is provisional.* 
CLADOCARPUS ALtMAN nov. gen. 
GENERIC CHARACTER. Tophosome. — Hydrosoma pinnate, plumose. Ne- 
matophores fixed; supracalycine nematophores one on each side of the 
orifice of the hydrotheca ; mesial nematophores either adnate to the front 
of the hydrotheca or free. 
Gonosome. —Gonangia not included in corbule, but borne on the sides 
or at the base of special protective branches (phylactogonia), which are 
appendages of the pinnex. 
The genus Cladocarpus was originally defined by me for the reception 
of a remarkable Plumularidan obtained in the eastern parts of the North 
Atlantic during one of the expeditions of the “ Porcupine.”t Its most 
important character is found in the possession of peculiar branching ap- 
pendages, which are destined to support the gonangia, or in some other 
way to afford protection to them. It is convenient to have a special name 
for these appendages, and that of “ phylactogonium” is suggested by the 
function which devolves upon them. 
The phylactogonia differ essentially from the corbulew, whether open or 
closed, of the Aglaophenix ; for they are not, like corbule, metamorphosed 
pinne, but appendages superadded to the normal pinne. 
In Kirchenpauer’s subgenus Macroryuchia the gonangia are also borne 
on special appendages, but the pine which in Cladocarpus retain their 
normal form, and support the phylactogonia, are here suppressed, and are 
represented only by short stunted processes destitute of hydrothece. 
The macrorychial Aglaopheniz of Kirchenpauer are further distinguished 
from Cladocarpus by the form of the mesial nematophores, which are very 
long, usually far surpassing the height of the hydrothecx, and which, as 
Kirchenpauer first pointed out, are always provided with a lateral as well 
as a terminal orifice after they cease to be adnate to the hydrotheca. 
* See Note on p. 56. 
+ Report on the Hydroida collected during the Expeditions of H. M. S Porcupine, Trans. Zool. 
Soc. Lond., Vol. VIII. Part VIII. 
il 
