XX. CONTENTS. 



Page 



Genkra dubia et Inceiote sedis 



Van Heurckiella Pant., 1892 . . . 540 



Spermatogonia Leud. Fortm., 1892 . . . 541 



Cheloniodiscus Pant., 1869 . . . 541 



Heribaudia M. Perg., 1893. . . . 542 



Genera Excld. 



Parelion Ad. Schm. 



Omithoceros Stein,, 1891. 



Index of Genera and .Species .... 543 



General Index . . . . . -555 



Addenda et Corrigenda ..... 558 

 Plates ....... 559 



