Freshwater Bryozoa, with descriptions of new Species. 201 
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 im 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 pots bemg 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 ; 
but on close examination are found to be composed of many, and 
rarely to number more than six or eight cells m each. The com- 
mencement of each polypidom has the black envelope of the ori- 
ginating egg adherent. 
Two or three specimens of a more branched form of carinated 
Plumatella were taken in Bromley Lough, which may probably 
prove a distinct species ; more individuals however are necessary 
before it can be characterized. 
Paludicella procumbens. PI. V. figs. 1 & 2, and Pl. IV. 
Polypidom membranous, subhorny, pellucid, smooth and glossy, 
of a brownish horn-colour, much and irregularly branched, form- 
ing large patches on the underside of stones, for the most part 
adhering, with rather numerous, short, free, almost simple 
branches ; the branches composed of a single series of narrow 
cells arranged longitudinally, contracting towards the base and 
widening upwards ; aperture lateral, near to the upper extremity 
of the cell, forming a rather long and somewhat constricted tube 
inclining upwards ; margin entire, surmounted by a widish, deli- 
cate, hyaline, membranous cup. Tentacles sixteen in number, 
arranged in a complete circle, and when spread out forming a 
very exact inverted cone. 
This, the second species of the genus, resembles very closely 
P. articulata of Allman, but that form appears to have about 
twenty-six tentacles, and is likewise more densely and luxuri- 
antly branched ; the cells, too, are larger and of a different colour. 
The P. procumbens occurred in both Bromley and Crag Loughs, 
but most abundantly in the latter, where it spreads over the 
under surface of stones in patches of 5 or 6 inches diaméter. 
