P 9 

 m n r -I 



Fig. 23. lophon proximum (Ridley), showing variation in size and shape of the main acanthostyH. a, I. chelifer 

 ostia-magna, Wilson (type); b, I. chelifer, Ridley and Dendy (co-type: B.M. 87. 5. 2. 157); c, I. chelifer, 

 Ridley and Dendy (type); d, I. chelifer, Ridley and Dendy (Lambe's specimen); e, Giog;f, I. indentatus, 

 Wilson (type) ; g. I. lamella indivisus, Wilson (type) ;//,/. lamella, Wilson (type) ; /, /. pattersoni (Bowerbank), 

 Ridley and Dendy (Challenger Sts. 308 and 311); 7, /• chelifer, Ridley and Dendy (Thiele's specimen); 

 k, D 255 ■,l,D256;m,D 251 ; n, D 739 ; 0, D 740 ; p, D 257 ; q, D 254, D 258 ; r, D 431 ; s, D 252 ; t, D 837 ; 

 u, D430; V, Alebion proximum, Ridley (type); w, lophon proximus (Ridley), var. reticularis, Hentschel. 

 All figures x 300. Figs. a,f, g, h after Wilson; fig. d after Lambe; fig.; after Thiele. Fig. w from a pre- 

 paration from the type. 



