ALDER, ON NEW BRITISH POLYZOA. 105 
other hand, this species approaches very near to some of the 
more slender branched varieties of E. Skenei, from which it 
can readily be distinguished, in a fresh state, by its more 
smooth and slender appearance, and by the absence of the 
pointed rostra, that give a prickly character to the latter 
species. 
Escuara Lanpssorovu, Johnston. (Pl. IV, figs. 1—3.) 
Polyzoary consisting of very thin and delicate foliaceous 
plates, anastomosing irregularly, and undulating- on the 
upper margin, which is a little expanded. Cells in longitu- 
dinal rows, placed alternately or in quincunx. They are ob- 
long, thin, and perforated with large punctures. Apertures 
with the margin slightly raised, nearly circular above, and 
produced into a point below, where there is a small, slightly 
prominent, circular avicularium, behind which is a truncated 
denticle. Ovicells prominent, globose, or ovate, silvery and 
perforated, produced below into a raised margin, surrounding 
the mouth of the cell, and giving it a triangular form. A 
rather large, spatulate avicularium is seen in some cells, 
placed transversely by the side of an ovicell, and raised a little 
from the surface (fig. 3). The two layers of cells are separa- 
ble. Height, two inches: breadth, about two and a half 
inches. 
Lepralia Landsborovii, Johus., ‘ Brit. Zooph.,’ p. 310, t. 54, 
fig. 9; Busk, ‘ Catal.,’ p. 66, t. 86, fig. 1, and t. 102, fig. 1; 
Hincks, in ‘ Journ. Micros. Soc.,’ v. vill, p. 277 (young state). 
Eschara foliacea, Alder, in ‘Trans. Tynes. Club,’ v. iii, 
p. 151. 
This delicate and fragile species was obtained some time 
ago on the north coast of Northumberland, by Mr. Embleton, 
of Beaduel Cottage, but was passed at the time of the publi- 
cation of my ‘Catalogue of the Zoophytes of Northumber- 
land and Durham,’ asa variety of HE. foliacea. A second and 
more careful examination, however, convinced me that it was 
a distinct and very characteristic species, hitherto undescribed 
as an Eschara, but not entirely unknown to science, as the L. 
Landsboroyii of Johnston turns out to be an encrusting form 
of this species, which has not until now been seen in its per- 
fect state. Mr. Bean, however, has lately sent me a small 
specimen for examination, got at Scarborough, in which a 
double layer of cells rises to about an inch in height; and 
Mr. Norman has dredged a variety of this species in Guernsey, 
