THE FOSSIL PHYLLOPODA OF THE PALEOZOIC ROCKS. 419 



Biscinocaris Browniana,'H..Wood\\a.rd . . '. . , . , 119-121 



? Birkhill Shales Dumfriesshire. 



Birkhill Shales. — Garple Linn, Moffat. 

 „ „ Dobbs Linn, Moffat. 



Argenteus-Zone, Skelgill Beds. — Lower footbridge, Skelgill Beck, near 



Ambleside, Westmoreland. 

 Birkhill Shales.— Dobbs Linn, Moffat. 

 „ „ Polmoody, Moffat. 



B. oralis, T. R. J. and H. W 121, 122 



Birkhill Beds.— Dobbs Linn, Moffat. 



B. undulata, T. R. J. and H. W ... 122 



Birkhill Beds.— Garple Burn, Moffat. 



B. gigas, H. Woodward . 122, 123 



Argenteus-Zone, Skelgill Beds. — Skelgill Beck, Ambleside. 

 Birkhill Shales. — Dobbs Linn, Moffat. 



B. BusUana, NovAk. 



^tage E-e, 1 — Gross-chucle, S. of Prague, Bohemia. — ' Geol. Mag.,' 

 1892, p. 148. 



Caudal Appendages ............ 124 



RiccartoD beds, pi. xvii. f. 8. — Shankend, Hawick 124 



Buckholm beds of the Gala group, pi. xvii. f. 13. — Meigle Hill, Gala- 

 shiels.—' Monogr. Pal. Soc.,' 1888, Part I. p. 45, 

 Mudstone of the' Barren Band,' Skelgill Beds, pi. xvii. f. 12.— Skelgill, 



Westmoreland •. . . 124 



Pont Seiont Beds, pi. xvii. f. 9-11. — Nantlle Tramway, near Seiont, 



Caernarvon 124 



Note by Professor C. Lapworth, LL.D., F.H.S., F.G.S. 



The fossils named in the preceding list are confined to the so-called 

 Lower Palaeozoic Rocks, constituting the original ' Silurian System ' of 

 Murchison and Barrande, and variously classified by geologists at the 

 present day. All are agreed, however, that they contain three distinct 

 faunas, namely, the ' First, Second, and Third Faunas ' of Barrande ; but 

 the three distinct series of strata containing these three faunas are vari- 

 ously grouped by diSerent authorities. The French geologists still retain 

 in principle the nomenclature of Barrande, and regard these three rock 

 groups as the three component divisions of the Silurian system, namely, 

 Silurien In/erieur or Primordial, Silurien Moyen, and Sihtrien Superieur. 



The plan adopted in the present notice is to regard each of these three 

 rock series as constituting in itself a distinct system, namely, (A) Cam- 

 brian, or the System of the First Fauna ; (B) Ordovician, or the System 

 of the Second Fauna ; and (C) Silurian (or Salojnan), or the System of 

 the Third Fauna. 



In the following table the various schemes of nomenclature lying 

 between the two extreme types are given for the sake of reference and 

 comparison, and the several formations which have hitherto yielded fossil 

 Phyllopoda (Phyllocarida) are arranged in their natural positions in the 

 general scale of sequence. 



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