Case and 
MIDDLE BALA GROUP. 





Reference to McCoy’s 
Colaeatiar Synopsis: and Figures of Genera. 
Gl 
Lace-corals. 
G Retepora, p. 48. 
Pl. 1¢, fig. 18. 
Gl 
Gi 
Gl p. 49. 
Crinoids. 
Gl 
EN tis 
A ae sey 
G1 
Pl. 1D, fig. 4. 
Globe- Crinoids, Cystidec. 
Gl 
Gl 
Pl. 1p, fig. 5, p. 61. 
Names and References; Observations, &c. 
Localities and Numbers. 




Ptilodictya acuta, var. minor, Hall. 
N. York, Vol. 1. pl. 26, fig. 3.) 
(See Pal. 
Phyllopora (King), Retepora of most authors. 
To this genus (which consists of lace-corals 
with the pores in many rows covering the 
outer surface of the cup-like frond) all the 
Reteporas of the Paleozoic rocks are re- 
ferred. They all differ from the living 
Retepores by having a calcareous layer on 
which the cells are set. 
Phyllopora Hisingeri, McCoy. A very common 
species. 
Phyllopora, sp. 
Phyllopora, sp. 
Fenestella Milleri, Lonsdale. The genus has 
much the appearance of Retepora, but is 
calcareous, and has cells only on the main 
rods ; not on the cross-bars (fig. see Wen- 
lock). 
Fenestella subantiqua (D’Orbigny, McCoy). 
F. antiqua Lonsd. Sil. Syst. pl. 15, fig. 16. 
Echinodermata, Starfish, Crinoids or Sea-lilies, 
and Cystidew (Grape-lilies, Globe-crinoids). 
Glyptocrinus? basalis, McCoy. (Celocrinus, 
Salter, Mem. Geol. Surv. Vol. m1. pl. 23, 
fig. 4.) The characteristic crinoid in Britain 
of the slate rocks—easily distinguished by 
its hollow stem. 
Echinospherites (Caryocystites) granatum, 
Wahl. 
Echinospherites (Caryocystites) Davisii, McCoy. 
Spheronites stelluliferus, Salter (Mem. Geol. 
Surv. Vol. m1. pl. 20, fig. 6 (S. awrantium, 
Forbes, in part only). 


Llechwedd Llwydd, Llan- 
santfraid, Glyn Ceiriog. 
a, 118, Cefn Coedog, S. of 
Corwen: Cyrn - y - Brain, 
Wrexham: Mynydd Fron 
Frys, Chirk, Coniston. 
Meifod. 
a. 220, Coniston (High 
Haume). 
Llansantfraid, Glyn 
riog. Cefn Credog, 
wen. 
Cei- 
Cor- 
Llansantfraid, Glyn 
r10g. 
Cei- 
a, 127, Alt-yr-Anker, Mei- 
fod. 
Rhiwlas. 
a. 125, 6. Coniston. 
Sholes Hook, Pembroke- 
shire. 
