<>f \'< rt< !>r<tt<H ami AVw of /'V.s//r.s 



is possible to identify and locate the more 

 abundant and wave-worn fragments. This fish 

 was so like its better-known English cousin, 

 Pterichthys, that 

 the picture of 

 the latter may 

 do duty for both. 



The figures Pterichthys, the wingflsh. Very much 

 I reduced. 



give a better 



idea of the animal than it is possible to con- 

 vey by words, but it may be noted that the 

 jointed arms occupying the place of the side 

 fins of a fish are really something like the legs 

 of a crab, for they have the hard parts on the 

 outside ana the muscles on the inside. This 

 is such a departure from the structure of or- 

 dinary back-boned animals, in which the mus- 

 cles surround the bones, that some naturalists 

 have thought it more than a mere resemblance, 

 and that it hinted at some real relationship 

 between crab and wingfish ; while some have 

 even gone so far as to consider this strong 

 evidence in support of the theory that verte- 

 brates are the descendants of crustacean!* 



95 



