286 



ARACHNIDA EURYPTERIDA 



CHAP. 



Fir,. 162. Etiri/fifcrnx /7.sr//c/-/. Eichw. Upper Silurian, Rootzikiill, Oesel. Restoration 



of ventral sui-farr : 1-6, appendages of prosonia ; m, metastoma. Immediately pos- 

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

 Holm.) 



