PROUT—BRYOZOA, 3D SERIES. 447 
— whether the differences on which Reemer estab- 
the genus Marginaria, or those on which Milne Ed- 
pe established the genus Escharina, will be found suffi- 
ciently essential to justify their separation from FVustra. 
can not be considered otherwise than a great evil to multi- 
ply Rep where specific distinctions would amply wat 
nds of scientific classification. The variation of 
type by essential structural modifications should form the 
y true basis of generic se gests 
Our species resembles the P. irregularis of Lonsd. (Diz. 
Geol. of Sussex, p. 319, Tab. xviii. B. fig. 9, 10, 11), but 8 
fers by the situation of the ovarian “capsules at the base of th 
cells, and the absence of notches at the extremities of the 
straight borders of the apertures. 
[wag a s FLUSTRA TUBERCULATA, 0. Sp. 
Bry 
g 
ate in their distribution; cel/s mostly open, by the de- 
struction of-their exterior expansion ; walls thin, common to 
ig cells, characterized by four eaud tubercles at each 
angle of the cell when quadrangular; exterior covering, where 
pope a flat dise with small apertures a little above the cen- 
tre; ieee small —— at the Vator of the cells, 
ee series, Barret’s nro 7 Louis Scar 
“We are compelled in offering these pl oe of Flustra, 
e 3 
do not really belong to this order, but to the fugi 
Hit ay with long tubes. It will be sbvioas, 9 we believe, 
ilies ‘the figures and descriptions given above, that some fam- 
at least of the Cellulina have lived during the Palwo- 
fade ; the cells of the two species above are such as we 
clined Celleporina, and such as no one would be in- 
ins to refer to the Tubuliporina. We are to be- 
eae that many other proofs could be furnished ssactie 
of the opinion to 5 wae we “_ refered. es 
