JURASSIC FOSSILS FROM RIKUZEN. 9 



side of a right valve on which is seen a rounded ridge on the 

 posterior margin just below the upper edge and parallel to it. 



The species occurs in England in the Inferior Oolite. 



Locality : — Hosoura and Niranohama, in a greyish sandstone. 



2. BELEMNOPSIS sp. 



PI. II. Fig. 1. 



There are several specimens of a lanceolate Belemnite, one 

 of which is about 35 mm. long and 8 mm. broad near its upper 

 end. They all show a deep ventral groove running down to the 

 apex. Therefore, although much water- worn, it is quite certain 

 that they belong to the subgenus Belemnopsis. 



Locality : — Hosoura. 



3. BELEMNOPSIS sp. 



PI. II. Fig. 6. 



A specimen of another form of Belemnopsis, the lower end 

 of which is not preserved, is much larger than that of the pre- 

 ceding one. It seems to be broadest a little below the alveole 

 where it measures about 12 mm. in diameter, thence slisjhtlv 

 tapering upward. 



Locality : — Hosoura. 



4. BELEMNITES sp. 



PI. I. Fig. 7. 

 This fragment of a large Belemnite more than 20 mm. in 



