PTERYGOTUS TAURINUS. 



75 



Fig. \A. — Pterygotus taurinus, Salter. Ledbury series, Ewyas Harold, Herefordshire. After a sketch by 

 Mr. J. W. Salter, F.G.S. (For description see page 76.) 



The shaded parts, namely, 1. the head-shield; 2, the chelate antenna; 3, the endognath; 4, the ectognath, or swimming- 

 foot ; and parts referred by Mr. Salter to the penultimate segment (xix) ; and the last segment or " telson" (xx) ; are alone 

 preserved. — H. W. 



