200 Mr. A. Hancock on the Anatomy of the 
muscular arrangement. Thus the Bryozoa become related to 
the Lamellibranchiata, which are apparentlyclosely related to the 
Brachiopoda. We may conclude then, if we have arrived at a 
right understanding of the affinities of these animals, that both 
the Mollusca and Vertebrata are connected with the Bryozoa. It 
would be well therefore to pause before including the Bryozoa in 
the Mollusca, and consider the propriety of uniting the former 
with the Tunicata, and perhaps with some of the higher forms of 
Rotifera, nto a group to be placed at the head of the Radiata. 
Descriptions of new Species. 
Plumatella punctate. Pl. V. figs. 6 & 7, and Pl. III. fig. 1. 
Polypidom adhering throughout, coriaceous, pellucid, of a pale 
watery green colour, irregularly but not much branched, seldom 
extending more than half an inch; branches composed of a series 
of large, conical cells tapering upwards towards the aperture, 
sometimes considerably and rather suddenly dilated at the base ; 
resembling in form some of the Ascidians; the upper portion of 
the cell almost colourless and freckled with minute opake white 
spots, most crowded towards the orifice. Tentacles white, not 
more than sixty in number; membrane at their origin rather 
wide, scalloped, the points of the scallop extending for some di- 
stance up the back of the tentacles in the form of broadish laminz 
arched outwards. (Hsophagus and stomach appearing through 
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 ex- 
ceeded in size that represented i in the figure, nor did they vary 
im any remarkable manner either in ee 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. Allmani. PI. V. figs. 3 & 4, and Pl. III. 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, 
