MICHIGAX ACADEMY OF SCIENCE. 



PLATE XXII. 



n/NUS ^£:S/NOSA 



L ;l ^'/xa/^^ — .vc* *-i«^.'--i"' -.^^r S'f.'X/Pf. - /vo t'V'^Te/^ 



^'t 'L r 



\0 SM^'iOE-Z^O /4^T;££' 

 (Ch-izCK) 



