286 



ARACHNIDA — EURYPTERIDA 



Fig. 162. — Eurypterus fischeri, Eichw. Upper Silurian, Eootzikiill, Oesel. Restoration 

 of ventral surface ; 1-6, appendages of prosonia ; m-, metastoma. Immediately pos- 

 terior to the metastoma is the " median process " of the genital operculum. (After 

 Holm.) 



