PLATI; xxxvi. 



Figures m:i'.:iiifi(Ml :',7"> <li;micti-r-.. 







PAGB. 



K!-,'. 1. MlCKASTERIAS PsEf]H)TOKRKYI, . . . . .118 



" 2. MICRASTERIAS AMKRICANA, ..... 124 



" 3. " " Var. recta, . . . .124 



li 4. transverse view, . . . 124 



" 5. . Vnr. Heri!i:iniiiana, . . . 124 

 Figs, (t, 7. MICRASTERIAS URACHYPTERA, two semi-cells varying somewhat 



indet:iil>. . . .121 



" 8, 9. MICRASTERIAS I-AI-ILLIFERA, two forms, . . . 120 



