JURASSIC AMMONITES FROM ECHIZEN à NAGATO. V 



which disappear in the last one fourth of the last whorl. The 

 umbilical wall is nearly perpendicular with the edge more or less 

 augulated. Body-whorl about $. 



The several irregular transverse grooves seem to be accidental 

 characters caused by rock-pressure. 



The suture-line is only partly visible. It consists of deeply 

 toothed lobes and saddles. 



As an Oppelia this species shows a comparatively wide um- 

 bilicus, recalling in this respect Oppelia nobilis Neum. of the 

 Tithonian of Transylvania and Switzerland. 



Locality : — Kaizara, in a micaceous shale. 



B. Ammonites from Nagato. 



The first discovery of Ammonites in the province of Nagato 

 is attributed to a certain school-master, Kimura by name, who, 

 in 1887, is said to have noticed them in a new road-cutting near 

 Nishi-Nakayama in the district of Toyora. But they were not 

 known to the scientific world, until they were collected by Mr. 

 K. Inouye in 1895. 



At present, the fossils are known from two places very near 

 to each other, namely, Nishi-Nakayama and Ishimachi, the dis- 

 covery in the latter place being due to Mr. Okada who visited 

 the district in 1899. In both places they occur in a clayslate, 

 which at Nishi-Nakayama has been weathered into a soft yellowish 

 shale. The preservation must be called imperfect, as the fossils 

 have been almost without exception pressed flat on the stone, 

 making their determination extremely difficult. 



