Plate 4 
(The figures copied after Dr. 
Henry Woodward's plate, Proc. Geol. Soc., vol. 
23, 1867.) 
Fig. 1. Belinurus reginae Baily Coal Meas- Fig. 5. Pseudoniscus aculeatus 
ures, Ireland. ski Sil., Baltic. 
2. Euproops  rotundata Exapinurus Schrenkii Nieszkowski 
Coal Measures, Eng. Silurian, Baltic. 
Fig. 3. Hemiaspis linuloides. HH. Wood- Eurypterus remipes De Kay Silur- 
ward, Ludlow, Eng ian, New York. 
Fie. 4. Bunodes limula Eichwald Silurian, 
Baltic. 
Nieszkow- 
ie 
Prestwich Fig. 6. 
Fig. 
