Z AKT. 20. — M. YOKOYAMA. 



the village of Kaizara, but there are also two other localities, 

 viz., Nagano and Shimoyama which in a direct line are not quite 

 4 kilometers from the first named place. 



The following is a profile along the river Ishidoshiro, as given 

 by Mr. Matsushima in his geological paper on Echizen (MS). 



A salii 



Nochino 

 Cyrena \ 



Asahi-Maisaka 

 Plants 



As might be expected from the mostly freshwater nature of 

 the Jurassic formation of Echizen, the Ammonite remains are of 

 very rare occurrence. Moreover their preservation is such as to 

 make their determination very difficult, the specimens being 

 generally flattened by rock-pressure. 



The following are the names of species which I have been 

 able to distinguish in these Ammonites : 



1. Perisphincles (ProcerUes) Matsushimai nov. sp. 



2. Perisphincles (Grossouvria) Hikii nov. sp. 



3. Perisphincles (Biplices) kaizaranus nov. sp. 



4. Perisphincles (Blplices f) Kochibei nov. sp. 



5. Perisphincles (Alaxioceras) sp. 



6. Oppelia echizenica nov. sp. 



Of the five species of Perisphincles, four are new, and the 

 remaining one is also probably so, although at present this is 

 uncertain. They are, excepting Perisphincles Hikii which shows 

 some relation to a Kelloway species, Perisphincles Steinmanni 

 Pak. et Bon., all more or less allied to the foreign Oxford 



