80 
YIXE : NOTES ON YOEEDALE POLYZOA. 
the present form. I think, howevei", that the two may be re^jarded 
as distinct species. 
Horizon: Yoredale (not unfrequent in the Scotch Lower and 
Upper Shales). 
Localities: Gleaston Castle, Little Urswich, Holker Park, 
W. Lancas. Hurst. Yoikshire. 
10. PlNNATOrOEA EETEOFLEXA, Young" & Young-. 
= Glauconome id., Y. & Y., Proc. Nat. Soc, Glasa'ow, 1875, pi. TL, 
figs. 8-10, pi. III., figs. 11-13. 
= Glauconome id.. Vine, Proc. Geol. Soc. Yorks , Vol. YIL, p. 335. 
Zoarium erect and robust, branches short, sub-alternate, 
bipinnate, branches at wide intervals, obverse finely g-ianulated. 
Zocecia on the stem longer than broad, alternate, their own length 
apart, one at the base of each branch, and one in the interval, partly 
hidden on the inner side by a keel, and bounded on the outside by a 
prominent peristome. Carina gentl}^ rounded, prominent, one third 
the diameter of the branch, and bearing several small tubercles. 
Reverse face of the branch evenly rounded and finely o-ranular. 
Localities : Yoredale ; Gleaston Castle, common ; Little Urswich. 
The retrospect aspect of the pmmxi of this species is a really 
good and constant character, and generally speaking it is almost 
impossible to mistake this for any other species of Carboniferous 
Polyzoa. It is veiy abundant in the lower shales of Scotland, and 
fairly abundant in the English shales both uf Lancashire and North 
Lancashire, but not so abundant in the Northumberland shales. 
11. PiNNATOPOKA ROBUSTA, Young & Young. 
= Glauconome i'L, Y. & Y., Proc. Nat. Hist. Soc , Glasgow, Vol. 
IIL, 1878, pp. 354-355, pi. IL, figs. 4, 7, 8, 9, 10. 
Zoarium erect, slightly flexuous, bipinnately branching at irreg- 
ular intervals ; pinnae opposite, or slightly subalternate and bent 
towards obverse face. Zoacia oval, alternate, about their own length 
apart. Keel on main branches prominent, rounded and tuberculated ; 
tubercles large, iriegularly placed, seven or eight to a quarter-of-an- 
inch ; obverse face granular or finely tuberculated " striate granulate." 
Locality : Yoredale ; Little I^rswich, very fine and robust ; 
Gleaston Castle, rare and delicate. 
