Plate IV. 



(All the specimens, here figured, are in Sei. Coll. Mus.) 

 Heteroccraf< OtmUMÎ m. I'p. 14-1(3. 



Fig. 1. Side view of the type. From FicchyJiscus-heds of the Kiknmezawa, 

 Ishikari Prov. Nat. size. Slightly restored. In this figure, the 

 larger end of the shell is shown below and the smaller end ahove.. 



Fig. 2. Side view of a portion of whorls of another specimen. From upi>er 

 Ammonite-beds of the Yiibarigawa. The siphon comes nearer the 

 lower margin toward the anterior end. Nat. size. 



Heterocera.'^ Otsiil-ni m. var. mulficodafa m. Pp. lG-17. 



Fig. 3. Side view of a specimen with numerous ri])S. From upper Am- 

 monite-beds of the Yübarigaw^i, Nat. size. 



Kij>i)<)iiiti'S mirahUis m. Pit. 20-25. 



Fii;s. 4 and i^, A'iews from two different directions of the type. From 



upper Annnonite-beds of the Opiraushibets. 

 Fig. I). Cross-section of the same. Nut. size. s. siphon. 

 Fig. 7. ^Yire-nlodel to show the mode of the coiling the whorls. 



