FOSSIL ECHINOIDS OF JAPAN. 21 



very short, curved, round and closed at the extremities, number 

 of pores 21. 



Peripetalous fasciole strongly recurved in postero-lateral in- 

 terambulacra, and retreating far from the centre in the odd posterior 

 interambulacrum. Lateral fasciole meeting with the former at the 

 extremity of the antero-lateral ambulacrum. 



Actin ostome situated about I diameter distance from anterior 

 edge. 



Tubercles on abactinal side very small, but large on actinal side. 



This species is characterized by having posteriorly a not very 

 elongate shell, a shallow anterior groove and straight antero-lateral 

 ambulacra. 

 Locality : — 



River bank of the Saigawa near Kanazawa, Prov. of Kaga 

 (Pliocene) (brought to O. Yoshida). 



SCHIZASTER NUMMULITICUS Tok. 

 PL IV. Figs. 4-6. 



Literature consulted : — 



S. Yoshiwara, Geological Age of Bonin Is. etc. — Geol. 

 Magazine, London, Dec. IV., Vol. IX., 1902, p. 298. 



Long. Trans. Height. Length of Length of ant. Length of post. 



diaiii. diara. odd petal. paired petal. paired petal. 



61.5nmi. 60 rum. 46 mm. 35 mm. 31mm. 15 mm. 



58.5 mm. 56 mm. 44 mm. 29.5 mm. 15 mm. 



Test thin, high, cordiform ; the broadest part lying a little 

 anterior to the apical system, and the highest point being in 

 that system ; anterior groove broad and deep ; median posterior 

 keel not very prominent. 



