tine: polyzoa of the wedlock shales. 195 
American Lower Silurian rocks." In the face of this prolific cata- 
logue it is manifestly impossible for me to attempt to co-relate 
British and American forms, and all that I shall do here is to give 
the revised list of Mr. Slirubsole, without remarks, and refer the 
student to his papers for special details. 
14. Fenestella rigidula, M'Coy, Brit. Pal. Foss., p. 50, pi. I., fig. 19. 
15. ,, reteporata, Shrubsole, Quart. Journ. Geol. Soc, May, 
1880, p. 249, pi. XL, figs. 1-lc. 
16. •„ lineata, Shrubsole, (1. c.) pi. XL, figs. 2-2a. 
17. „ intermedia, Shrubsole, (I.e.) p. 250, pL XL, figs. 3-3a 
These are the whole of the Upper Silurian species accepted by 
the author, but if better material could be obtained, in all probability, 
two at least, if not three, could be added to the list. The Carboni- 
ferous list is equally poor, five species only are accepted as genuine 
by ^Ir. Shrubsole. The genus Ptilopora is peculiarly carboniferous, 
so also is Pinnatopora; but from certain investigations made by 
Mr. Shrubsole, he is inclined to admit one species at least from the 
Silurian rocks as a member of this latter group. 
17. Pinnatopora sedgwickh, Shrubsole, Quart. Journ. Geo. Soc., 
May, 1884, p. 330. 
= Glanconome disticha (pars.) Lonsdale, Brit. Pal. Foss , p. 49. 
= Ramipora hoch.stetteri (Toula.) Var. carinata R. Eth., Jun. 
Geol, Mag 1879, p. 249. 
Pinnatopora Sedgwickii Shrubs, Proc. Chester Soc. Nat. Sc., 
No. 3, 1885. 
Loc. and Horizon: Fairly abundant in the Bala beds of Glyn 
Ceiriog, Denbighshire, and Bwlch-y-gaseg and Cerig Coedog, South 
of Corwen and Boyntirion. 
Family PoLYPOPviDiE. 
Fam. Polyporidse, Vine, Brit. Assoc. Rep., Foss., Polyzoa, 1883. 
Zoarium forming large and small fenestrated expansions. Zo?ecia 
contiguous : with three rows and upwards of cell-openings in a row, 
on one side only. Branches united by dissepiments or by anas- 
tomosis. 
