PLATE XVIII. 



UPPER SILURIAN CRUSTACEA. 



Order — Merostomata. 



Sub-Order — Eurypterida. 



Figs. 1, 2. — Slimonia acuminata, Salter, sp. P. 105. 



Fig. 



1. The appendages detached from the head, but otherwise found entire, as represented. 



The lip-plate, the great swimming-feet, the endognaths, and even the antennas, are 

 preserved. 



The specimen is drawn two thirds the natural size. 



2. A detached head-shield belonging to a young individual. P. 106. 



The large compound eyes (o, o) and the larval eye-spots (ie) are well seen. 

 Drawn of the natural size. From specimens in the British Museum. 

 Formation. — Uppermost Ludlow Rock. 



Locality. — Lesmahagow, Lanarkshire. 



