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 Nieszkow- 



ures Ireland. ski Sil., Baltic. 



Fig 2 Eup'roops i-otundata Prestwich Fig. 6. Exapinurus Schrenkii Nieszkowski 



Coal Measures, Eng. Silurian, Baltic. ^ -,, 



Fig. 3. Hemiaspis linuloides. H. Wood- Fig. 7. Eurypterus remipes De Kay Silur- 



ward, Ludlow, Eng. lan. New \ ork. 

 Fig. 4. Bunodes limula Eichwald Silurian, 



Baltic. 



