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