THE A ME RICA N NA TURALIST [Vol. XXXVII. 



a final note, it is announced 

 itely examining their structure 

 to determine their true relationship either to the crustaceans or 

 to the fishes. When Huxley's paper appeared, although he 

 gave a very good description of the minute structure of the 

 shell of these animals and concluded that they are not crus- 

 taceans, he entirely ignored the existence of the eye tuber- 

 cles, although their presence afforded very weighty evidence 

 against his conclusion. 



Lankester ('68, p. 26) admitted the presence in Cyathaspis 

 of tubercles corresponding with similar tubercles in Pteraspis, 

 which are "produced by the supposed orbits"; but how a 

 vertebrate eye. or an "orbit," could be preserved as a beauti- 

 fully rounded protuberance when all the other soft parts are 

 completely destroyed, is not discussed. 



Lankester however, ('73, p. 241), still maintained the validity 



Pledge of the Be 



von Allth's discovery shows Scap 

 of Pteraspis, and thus we may assume that his "twofold regret" 

 for Kunth's untimely death was in a measure mitigated. 



Lankester attaches much importance to the presence of scales 

 on the anterior trunk region of Pteraspis, for these scale-like 



belong to the vertebrates. As Lankester says ('68, p.^S) 

 -All that is known as regards the scales of these Fishes is from 



