VINE : CLASSIFICATION OF THE PALAEOZOIC POLYZOA. 23 
species both by Busk, and Hincks. In Crisia eburnea these 
" punctures " are thinly distributed, having a circular mouth, and 
on the sides of the cell we get a longitudinal aspect of the same, seen, 
however, to much better advantage whenever the walls of the cell are 
broken. The " punctures " penetrate the substance of the cell wall 
from the surface, opening, apparently on the inner side of the tube. 
In the more highly calcareous cells of Hornera foliacea similar 
punctures to those of Crisia may be observed, only they are larger, 
and even under a lower objective the punctured tubes show a longer 
section on account of the thickness of the cell-wall. In the dissepi- 
ments which connect the branches of the Zoarium the openings of 
punctures are larger, but many of these appear to be of a different 
character to those of the smaller openings in the cell walls. 
Mr. A. W. Waters' in his admirable paper on " Fossil Cyclosto- 
raatous Bryozoa form Australia,""" refers to the punctured surfaces of 
the Cyclostomata, and he suggests a possible homology between some 
of the lateral interzooecial tubes and the rosette plates of the Chilos- 
tomata. Mr. Waters refers also to the almost general constancy of 
the size of these punctures in preparations he had made of Tertiary 
Cretaceous, and even Palaeozoic species, " The structure is well 
shown, he says, in sections, figured by J. Beissel, especially 
in pi. X., fig. 127 in his paper, Ueber die Bry. der Aachener Kreide.f 
■ ■ • These, I take it (the surface punctures) are the homo- 
logues of the much larger pores in the front of nearly all Chilosto- 
mata, which there also cause the Zooecial ornamentation," p. 677, 
op. cit. I have already referred to the interzocecial pores in the walls 
of the cell when sectioned, but Mr. Waters affords an illustrated 
instance, (pi. xxxi., fig. 24, op. cit.) in Heteropora pelliculata, Waters, 
in which a diphragm, or plate, seemingly perforated in the centre, 
occurs in the middle of the pore-tube, and thus it seems entirely to 
correspond to the simplest of the rosette plates among the Chilosto- 
mata," p. 677, op. cit. Mr. Waters also refers to the " surface 
pores " in other genera, such as Entalophora, &c. ' " " but in 
some genera, such as Hornera, some Idmonew . . both living and 
♦ Qufirt. Jour. Geo. See, Vol. 40 (1884), pp. 674-697. 
t Nat. Verb. Holl. Maat. Weten. Haarlem, xxii., (e) Deel. 
