






44 UPPER CAMBRIAN. 
Ce eatat EUR EED aa McCox's Names and References; Observations, &c. Numbers and Localities. 
Drawers.| Synopsis: and Figures of Genera. 
G Veal, al ae fig. 25, p. 4l. Petraia uniserialis, McCoy, a small short | a. 203, Llansantfraid (on 
case species. tablet with P. subdupli- 
cata, as above, case G). 
(Lace-corals, &c.). Polyzoa (Bryozoa, Ehrenberg). Placed here, 
as a high type of the Radiata (Ceelenterata, 
Huxley) by Prof. McCoy. Naturalists usu- 
ally, and with good reason, allot them a 
place with the molluscoids—near the Tuni- 
cate group. The Lace coral and most of the 
deep sea minute corals, as they are called, 
are really Bryozoa. But they assume so 
much of the aspect of branching corals, that 
it is convenient to arrange them with them 
in the cabinet—especially as in fossil forms 
Phyllopora. it is not always possible to separate these 
two widely remote groups. A Polyzoon is 
nearer to a Terebratula than to the coral it 
imitates. 
G1 Berenicea. Berenicea heterogyra, McCoy, a flat patch of | Coniston. 
VEAL, TL G}, sakes, IL(, os G5, cells, growing on shells. 
G1 Berenicea heterogyra, var. Cader Dinmael, W. of Cor- 
wen. 
Gl p. 46. Ptilodictya costellata, McCoy (Genus Sticto- | a. 219, Llansantfraid, Glyn 
Pl. 1 ¢, fig. 15. pora of Hall). The genus consists of branch- | Ceiriog. Girvan, Ayrshire. 
ed fronds, flat or rather slightly convex on 
each side with regular cells on either face. 
The quincunx arrangement of these gives 
an elegant pattern in the cast. There are 
very many species—and the genus ranged 
over the world in Paleozoic time. 
Gl Pl. 1 c, fig. 14, p. 47. Ptilodictya fucoides, McCoy. A narrow-leaved Llansantfr aid, Glyn Cei- 
form. riog, Corwen, Bala, several 
localities. 
Gl Pl. 1 c, fig. 16, p. 46. Ptilodictya explanata, McCoy. A  broad- | Llansantfraid, | Mynydd 
leaved, crisped and undulated frond, with | Fron Frys, near Chirk. 
large cells. Cyrn-y-Brain. 
G1 (P. acuta, p. 45 also). Ptilodictya dichotoma, Portlock, Geol. Rep. | a. 117, Coniston. 
Londonderry and Tyrone, pl. 21, fig. 3), St. 
acuta of Hall is not the same as ours—but 
yet occurs in Britain. 


Llansantfraid, Glyn Ceiriog. 
