Natural History of Hast Finmark. 89 
Surface of zoarium with raised nodulous processes. No 
avicularia. No pore-chambers. 
Ammatophora nodulosa is a rare species which I have only 
seen from two localities—in deep water off the Antrim coast, 
and in about 15 fathoms at Guernsey; in the former case on 
a stone, in the latter on small valves of Pecten opercularis. 
The living. zoarium is covered with a glistening yellowish 
epitheca, which conceals much of the real structure. The 
operculum in the Guernsey specimens is simple and the 
margin but slightly thickened ; in the Antrim specimen it is 
more highly chitinized, in form of half a circle, with the lower 
corners slightly turned out. The nodulous processes consist 
generally of one at the bottom of the zocecium or of two at the 
angles of the bottom. The ocecium rests upon, but is not 
firmly united with, the knob which terminates the side wall 
of the zocecium. It is very difficult to understand the dif- 
ferent forms which the occium assumes, and which will be 
better understood from the figures (figs. 5,6, 7) than from any 
description. The figures and generic characters are drawn 
from specimens which have been boiled in liquor potassz, and 
thus the epitheca have been removed. MHincks’s drawing 
represents the zoarium in its natural condition. This is a 
very curious species; in the process of boiling some of the 
occia entirely separated themselves from the zoccia, and that 
without any fracture. The granulated knob at the summit 
of the side walls, and the knobs of the ocecium which rests 
upon it, forcibly reminded me of the limb-joints in the 
human body ! 
Genus Rossex1Ana, Jullien, 
Rosseliana, Jullien, ‘Mission Scientifique du Cap Horn, 1882-1883,’ 
1888, p. 79. 
Type, Rosseliana (Flustra) Rosselit (Audouin). 
Membranipora Rosselii, Hincks, Hist. Brit. Marine Polyzoa, p. 166, 
pl. xxii. fig. 4, 
There are two, more rarely three, pair of lateral pore-cham- 
bers and one large distal one—this last sometimes divided 
into two or three ; but the chambers do not project beyond 
the breadth of the walls. Ina specimen coating the inside of 
a shell of Pecten opercularis, in that part which was attached 
to the wavy portion near the edge of the Pecten, the back 
wall of the zoarium was much thickened and every zocecium 
was separately marked out (i. e. higher in the middle and 
sloping at the sides); and each bore about three pustules 
