506 Kryshtofovich — Cretaceous Age of the 



although without associated invertebrate faunas. Thus 

 the three established Series of the Cretaceous in Russian 

 Sakhalin, the Orokkian, Gyliakian, and Ainuan, may be 

 florally characterized as follows : 



I. The Orokkian. This series is chiefly characterized 

 by broad leaved types besides a few ferns and some 

 conifers, from which I have as yet identified only 



Asplenium dicksonianum Heer 

 Sequoia smittiana Heer 

 Populus arctica Heer 

 Credneria sp. 

 Hedera mcclurii Heer 

 Viburnum schmidtianum Heer 



II. The Gyliakian flora, very rich and varied, and 

 studied in more detail by me, contains 



Dicksonia mamiyai n. sp. 



Asplenium dicksonianum Heer 



Pecopteris virginiensis Fontaine 10 



Pecopteris cf. bohemica Corda? 



Pteris frigida Heer 



Stenopteris jimboi n. sp. 



Sagenopteris variabilis (Vel.) Velen. 



Cycas steenstrupii Heer 



Glossozamites aff. schenckii Heer 



Nilssonia serotina Heer 



Ginkgo sp. A. 



Ginkgo sp. B. 



Protophyllocladus subintegrifolius (Lesq.) Berry 



Dammar a borealis Heer 



■Sequoia reichenbachii (Gein.) Heer 



S. fastigiata Sternberg 



Thuja cretacea (Heer) Newberry 



Populus arctica Heer 



Cocculus aff. extinctus Yelenovsky 



Credneria aff. integerrima Zenker 



Bauhinia cretacea Newberry 



Celastrophyllum yokoyamai n. sp. 



Aralia polevoii n. sp. 



A. tikhonovichii n. sp. 



MacClintockia sachalinensis n. sp. 



III. The Ainuan flora, studies in less detail, shows 

 only the following species : 



10 Eef erred by Berry to Cladophlebis irowniana (Dunker) Seward. 



