2o8 



P TERICHTH 1 'OMORPHI 



in the Coccosteomorphi, are evidence of wide divergence. On the 

 other hand, the Pterichthyomorphi have much in common with the 



Fig. 181. 



PtericMhys Milleri, Ag. Dorsal (A), ventral (B), ami left lateral aspects (C); restored. 

 (Alter Traquair, from A. S. Woodward, Pro<: Geol. Assoc.) a.d.1, anterior dorso-laterali; ag, 

 angular; a.m. d, anterior median dorsal; a.v.l, anterior ventro-lateral ; c, central; d.a, dorsal 

 anconeal; d.ar, dorsal articular; e.l, extra-lateral; e.m, external marginal; i.m, internal 



marginal ; /, lateral ; l.occ, lateral occipital ; m, median ; m, m, m, m, marginals : nuocc, ] lian 



occipital ; m.v, median ventral ; mx, maxilla ; o, ocular ; p.d.l, posterior dorso-lateral ; pm, pre- 

 median ; p.m.d, posterior median dorsal ; ptm, postmedian ; p.v.l, posterior ventro-lateral ; si, 

 semilunar; t, terminal; v.a, ventral anconeal ; v.ar, ventral articular. Dotted lines 'indicate 

 the course of lateral-line canals. 



