Plate I. 



Fig. 1. Pcrna rikuzenica n. «}). a lateral view of a right valve ; h front 



view of both valves. 

 Fig. 2. Baiera ? s[). 

 Fig. 3. TrUjonia hosourensis ii. sp. a Left valve ; h right valve, e showing 



area and escutcheon. 

 Fig. 4. Cyrena eUiptica n. sp. a right valve ; h front view of the same. 

 Fig. 5. Uarpoceras Ihianwn u. sp. ct lateral view ; h view of the external 



side. 

 Fig. 6. ScMotheimia Jiinhol n. sp. (f lateral view ; b showing the groove 



of the external side which is narrowed by pressure. 

 Fig. 7. Jielannites sp. a and h seen from opj)osite sides, h showing a 



part of the phragmocone. 



