ON FOSSIL POLYZOA. 205 
different, for Lonsdale says that G. disticha has ‘ four rows of long quad- 
rangular cells on one side’ of the zoarium. 
Wenlock Shales. Glauconome disticha.! Lonsdale’s sp. 
a Limestone. 5 3 
Family RHABDOMESONTIDA. 
Zoarium rod-like, branching. Zowcia opening on all sides of the 
branch, tubular, attached by their proximal extremities to a central rod. 
Orifice of cells obscured by vestibule; wall of vestibule externally orna- 
mented by spines or not. 
RuaBpomeson, Young & Young. 
(See ‘ Bibliography ’ for references.) 
Although the Messrs. Young have written two papers on Rhabdome- 
son species, they have not, so far as I am aware, given other than brief 
descriptions of the genus. In their first paper (‘ Ann. Mag. Nat. Hist.’ 
May, 1874), after reviewing the history of Ceriopora, they say: ‘The 
essential character of the fossil we are about to describe (Millepora gracilis, 
Phill.) separates it from all known Carboniferous forms; we would 
suggest Rhabdomeson as the generic name, the axis being central, not 
lateral as in Allman’s Rhabdoplewra. (See Hinck’s ‘ Brit. Mar. Polyzoa,’ 
. 577.) 
: In describing one of these figures the authors speak of the ‘ vestibules’ 
of the cells being filled with matrix. I have satisfied myself by sections 
that these vestibules really exist in species, and I give below the two 
at present known to exist. 
Devonian and Carb., Rhabdomeson gracile, Phill. =Millepora, Phill. 
Det =Ceriopora, Morris. 
Carboniferous, * rhombiferum=Ceriopora, Phill. 
Part III. 
Psgupo-Poryzoan Forms. 
= Bryozoans of American and other Authors (pars). 
I think it would be unwise to allow this Report to pass out of my 
hands without directing the attention of the paleontologist to what I 
have ventured to call Pseudo-Polyzoan Forms, some of which are very 
common in the Wenlock Series of Rocks, but the types are described 
from the Cincinnati Rocks of America. 
Family ArTHRONEMIDA, Ulrich. 
‘Zoariwm dendroid, composed of numerous small sub-cylindrical seg- 
=| = > ¢ r 
ments, carrying cells on one or both sides.’—‘ Amer. Palzoz. Bryozoa 
(op. cit.), p. 151. 
1 The so-called Glauconome disticha, of the Bala Beds, which has been described 
and figured by Mr. Robert Etheridge, jun., asa variety of Toula’s Ramipora, is being 
investigated by Mr. G. W. Shrubsole, F.G.S. 
