BRYOZOA, WITH DESCRIPTIONS OF NEW SPECIES. 401 
the transparent walls of the cell, of a pale yellow colour. Egg 
perfectly black, large, broad, and oval. 
Upwards of a dozen specimens of this fine species occurred in 
Bromley Lough, adhering to the underside of stones ; it was like- 
wise taken in Crag Lough. None of the individuals much 
exceeded in size, that represented in the figure, nor did they vary 
in any remarkable manner either in form or colour. It is not, 
however, without hesitation that I have ventured to characterize 
this as a new species, as Professor Allman informs me that it 
may perhaps turn out to be P. repens ; but that form is stated 
to be large and of luxuriant growth, and to have the polypidom 
tubular with the cells dilated at the orifice—characters which do 
not at all agree with P. punctata. Indeed it can scarcely be 
considered a true Plumatella. 
P. Alimani. PI. VI. figs. 3, 4, & 5, and Pl. IV. figs. 2 & 3. 
Polypidom attached to the underside of stones, adhering 
throughout, membranous, opake, yellowish brown, slightly 
branched, extending in patches sometimes three or four inches 
wide, the patches being made up of several polypidoms; the 
branches composed apparently of a series of tubular cells, tapering 
to their origin, and attached for more than half their length ; the 
enlarged extremity being free and bending upwards, inclines a 
little to one side, and is occasionally bifid, forming two cells ; an 
obtuse ridge or keel extends the entire length of the cell, increasing 
imperceptibly in thickness upwards; orifice somewhat constricted, 
the walls immediately below being pellucid, and suddenly dilating 
become abruptly opake, and thickly covered for some distance 
downwards, with agglutinated sand. Tentacles forty-two in 
number, slightly tinged with yellow, the colour best seen when 
they are formed into a compact bundle ; membrane at their base 
distinct, scalloped, the points being prolonged a little up the 
tentacles. Egg black, long, oval ; sides nearly parallel ; margins 
pellucid, yellow, sharp, broad, and reticulated. 
This species was procured rather abundantly in Bromley Lough, 
and does not appear to vary much. At first sight large patches 
of it have the appearance of being formed of a single polypidom ; 
