102 ALDER, ON NEW BRITISH POLYZOA, 
tions. The ovicells are few and very little raised. Height 
1 to 1} inches. ; 
Pustulipora gracilis, Sars, ‘ Reise i Lof. og Finm.,’ 1850, 
p- 26. 
Onchopora borealis, Busk in ‘ Journ. Micros. Soc.,’ p. 215, 
t. 28, figs. 6, 7. 
Quadricellaria gracilis, Says, ‘ Norske Polyz.,’ p. 15. 
This interesting Polyzoon has, until lately, been much 
misunderstood. ‘The only notice of it as a British species is 
that of Mr. Busk, who described it under the name of 
Onchopora borealis, from a small and imperfect specimen in 
Mr. Barlee’s collection. That so imperfect a scrap only 
should have come into Mr. Busk’s hands for description must 
have been by some mistake, as Mr. Barlee brought several 
specimens from Shetland in 1858, where it was also ob- 
tained last summer by Mr. Norman. It is a deep-water 
species, and has not been found in any other locality in 
Britain, but appears to be not uncommon on the Norwegian 
coast. 
Prof. Sars considers this genus to be without avicu- 
laria. None is seen in the usual position on the under lip 
of the cell aperture, nor does the small tubular orifice below 
it appear to possess that character, but two other circular 
orifices, slightly tubular, are generally present one on each side 
of the central orifice already : named, and continuous with the 
marginal perforations ; these are certainly avicularia, and 
bear a horn-coloured semicircular mandible. Two other 
similar avicularia are frequently seen below these last on the 
margin of the cell. There is an obscure, slightly raised 
ovicell, with a striated surface in the usual position above 
some of the cells, with an opening within the upper lip. 
M. Sars appears to doubt this being a true ovicell, but the 
coloured contents shining through its transparent wall, as in 
other species, show its ovigerous character. 
Escuara ta&vis, Fleming. (PI. III, figs. 8-11.) 
Polyzoary white or yellowish, smooth and polished below, 
dichotomously branched; the branches cylindrical, rising 
from a short and stout stem, spreading much laterally, and 
slightly tapering to a blunt apex. Ce//s immersed, ovate, 
very obscurely granulated on the surface, and perforated at 
the sides. Apertures generally a little higher than broad, 
arched on the upper margin, slightly contracted at the side 
