ALDER, ON NEW BRITISH POLYZOA, 107 
and makes it necessary to give another name to the species 
now under consideration. 
E. pavonella, like the foregoing species, is sometimes found 
assuming all the three forms of a Lepralia, a Hemesehara, 
and an Eschara, according to the substance on which it is 
developed, often clasping the stems of zoophytes in a single 
layer before rising into a double foliaceous expansion. It is 
a deep-water species, only yet found on the north-east coast 
of England, ranging from Cullercoats to Scarborough, and 
extending eastward to the Dogger Bank. 
Family CELLULARIADA, Busk. 
ScrvrocerLarta Deniniu, Audouin, (PI. III, figs. 4—8.) 
Polyzoary slender, shining, dichotomously branched, con- 
spicuously jomted, the internodes containing from five to ten 
cells each. Cells ovate, narrowed below; apertures oyal, 
with smooth margins, bearing one stout spine (or sometimes 
two) on the upper and outer margins, and a smaller one on 
the inner margin. Operculum ovate, channelled with tubes, 
forming a lobated cavity. Marginal avicularia moderately 
prominent; there is also a tubular or conical avicularium in 
the centre, in front of each cell. Vibracular capsules (sinus 
of Busk) transversely wedge-shaped, stretching across the 
back of a cell and part of the adjoining one. Vibracula 
short, rising from the upper and outer angle of the capsule, 
below which is an aperture for one of the radical fibres, which 
are numerous and scattered over the whole of the branches. 
Ovicells small, smooth, and imperforate. Height half an 
inch. 
Crisia Delilii, Aud., in Savigny’s ‘ Egypt’ (fide Busk). 
Yellularia scrupea, Alder, in ‘Trans. Tynes. Club,’ y. in, 
. 148. 
: Scrupocellaria Delilii, Busk, in ‘Journ. Micros. Soc.,’ 
V. vil, p. 65, t. 22, figs. 1, 2, 3. 
I obtained specimens of this delicate little Scrupocellaria a 
few years ago, from the deep-water fishing-boats on the 
Northumberland coast, but did not at the time observe its 
distinctness from 8. scrupea, with which it agrees in having 
the cells operculated. It differs, however, in having an 
avicularium on the front of each cell, and in the peculiar 
shape of the vibracular capsule, which is transversely wedge- 
shaped, while in the other known species it is bilobed and 
