4 ART. 8. — M. YOKOYAMA : 



1. Neuropteris ßexuosa Sterne. 



2. Tœniopteris multinervis Weiss. 



3. Fecopteris arborescens (Schloth.). 



4. Callipteriduim orientale Schenk. 



5. Lepidophyllum sp. 



6. Cordaites pî^incipalis (Germ.). 



7. Samaroims affinis Schenk. 



8. Pteroj)liyllum carbonicum Schenk. 



I obtained only four plants, all contained in a dark micaceous 

 slialy sandstone or sandy shale ; viz., 



1. Calamités Cistii Brgt. 



2. Aiinularia stellata (Schloth.). 



3. recop)teris arborescens (Schloth.). 



4. Coî'daites principalis Germ. 



Schenk took the Pen-hsi-hii plants as somewhat younger 

 than those of the other places in China then studied by him, 

 and seems to have meant by it the Upper Carboniferous. Zeiller, 

 liowever, who considers Schenk's Neuropteris ßexuosa as belonging 

 to Neuropteris Mather oui Zeill., a species found only in the 

 uppermost Stephanian, is of opinion^^ that the flora of Pen-hsi- 

 hu is probably Permo-Carboniferous. In this he relies, among 

 others, on Tœniopteris multinervis, form hitherto found not lower 

 than the lowest Permian. The two forms newly added by our 

 collection have nothing against this assumption. Calamités Cistii 

 which is found in the Westphalian as well as in the Stephanian 

 goes up to the highest part of the latter, while Annularia stellata, 

 as already mentioned, is Permian as Avell as Carboniferous. 

 Therefore respecting the age of the Pen-hsi-hu flora, I follow the 

 opinion of the learned French palœobotanist above mentioned. 



1) Note sur lu Flore Ilouiller du Chansi, Annales des Mines, Livr. d'Avril, 19U1. 



