Trans. E. S. C, 1891. 



Trilobita. 



Sec. IV. Pkte XIII. 



S<t 



2i 



^^Si ^5 



S'^ 



I 



St 



u 



W" 1ûi 



10 



ed , 



/«" 



/ifi' 



4M 



To illustrate Mr. G. F. Matthew's Paper. 



