A.Agassiz.Revision of the Echini 



PIXIII. 



Q 



15 



m 



^i. 





.. --?-iv. 



4.' 



"^eS^fe?^^^' 





g-*:^'* 













Ay^ 



"JigSiiSi 



...••..•••y'-*A-*i! 







V 



^Sr/ 



J6 





PRoelterljthog 



AleX-Ag'assiz del - 



?t:u I tyK V/. Loagfellow. 



