Teilina sp. 

 Solen sp. 

 Anomia sp. 



The Gasteropoda thus far present in the deposit are: — 



Eburna Japonica, Lischice. 



Lampania multiformis, Lischke. 



Potamides fluviatilis, P. et M. 



.Rapnnu bezoar, Linne 



Turbo granulatus, Gmelin. 



Natica Lamarckiana, Duclos. 



Cyclina chinensis, Chem. 



Purpura sp. 



Cyclostoma sp. 



Mya arenaria, Linne. 

 It is interesting to observe the great scarcity of Mya arenaria, a species 

 extremely abundant in the Hokkaido (Yeso) deposits as well as in the shell 

 mounds of Omori and Tokio. 



Only fourteen specimens of Area granosa were found and these were much 

 smaller in size than those existing in the southern portions of the empire. 

 Among the twelve perfect specimens, the largest measures 33 mm. in height, 

 44 mm. in length, while the smallest measures respectively 17 mm. to 23 mm. 

 The number of ribs were nineteen which is the average of the number of ribs 

 seen in the Omori mound specimens. It is probable that this was its northern 

 limit at that time. 



The most abundant species found in the deposits are Area inflata, Reeve, 

 Area subcrenata, Lischke, Mactra veneriformis, Deshayes, and Rapana bezoar, 

 Linne, and the remaining species were few in number of individuals, and more 

 or less broken. 



No worked shells were met with. It is worthy of notice however that the 

 specimens of Rapana bezoar, Linne, have almost always an irregular opening in 

 their body whorl, as if it had been made for the more convenient extraction of 

 the animal. 



