Plate IL 



Fig. 1. Abactinal view of Salenia lialckaidoensis P. de Loriol. From 



Yûbari, Prov. of Ishikari. 2 x 

 Fig. 2. Abactinal view of Ekinodiscus formosus Yosh. Showing petals and 



lunules. 2 x 

 Fig. 3. Abactinal view of Astriclypeus integer Yosh. Showing petals and 



lunules. 

 Fig. 4. Actinal view of Astriclypeus integer Yosh. Showing lunules and 



teeth. (Surface eroded). 

 Fig. 5. Actinal view of Fibularia acuta Yosh. Drawn from a living speci- 

 men. (Magnified). 

 Fig. 6. Abactinal view of Fibularia acuta Yosh. Drawn from a living 



specimen. (Magnified). 

 Fig. 7. Spine of Cidaris a sp. From Iwasa, Prov. of Tosa. (Magnified). 

 Fig. 8. Spine of Cidaris ß sp. From Itsukaichi, Prov. of Musashi. 

 Fig. 9. Spine of Cidaris s sp. From Yokodani, Prov. of Tosa. 

 Fig. 10. Spine of Cidaris 6 sp. From Itsukaichi, Prov. of Musashi 



(Pestered). 

 Fig. 11. Spine of Pseudocidaris a sp. From Torinosu, Prov. of Tosa. 

 Fig. 12. Spine of Pseudocidaris ß sp. From Torinosu, Prov. of Tosa. 



(All figures except figs. 1, 2, 5, G and 7, in natural size). 



