Plectrodus.

193

Pisces.

Subdivision.

Genus, Species, andAuthor.

Lower Stage.

Middle Stage.

Upper Stage.

U.L.

Plectrodus, Agassiz, 183

9.

Ludlow (England).

pleiopristis, „

pustuliferus, „

Selerodus.

Pteraspis, Kner, 1847.

Pass.-bds.,Down-ton Sa.

L.L.

Kington and vicinity (Here­ fordshire ).

Church Hill (England).Kington (Herefordshire ).Kington, Ludford L. (Lud­ low ).

N orton & Ludlo w (Shropsh.).

Ludensis, ?

tnmcatus, Huxley & Salter,sp. ind., „ „

Selerodus, Agassis, 1839.parvidens, Agassiz ?

Passage-beds ...

T7 L.

Sphagodus , Agassis, 183

9.

Thelodus, Agassis, 1839.parvidens, Agassiz.

Thyestes , Eickwald, 185

Eurypterus Lst.

4.

Roodzikiille, I.Oesel(Baltic ).

Ohhesaar, I. Oesel (Baltic ).

Cepkalaspis.

Tollipeltis, Pander, 1856.