PLATE IV. 



Fkj. Page. 



1. Ho2>lo/)f('ri/,r leiresiensis (Mantell) ; vertel^ral column, left lateral aspect, 



nat. size. — Chalk; Leaves. Capron Collection (B. j\I. no. 498(32). 



c, hfemal arcli of first caudal vertebra. 19. 



2. Hojjlojttrri/,1' sii2)rr]jiis (Dixon) ; ventral aspect of trunk, nat. size. — 



Chalk; probal)lj Sussex. Beckles Collection (B. M. no. P. 9153). 



a., anal fin ; j>Jr., pelvic fins. 21. 



3. Ditto ; imperfect fish, left lateral aspect, one half nat. size. — Chalk ; near 



Maidstone. B. M. no. 82340. ((., anal fin; c, caudal fin; r/., dorsal 



fin ; ()/)., opercidum ; ])Jr., ]ielvic fins. 21. 



