10 ART. 0, M. YOKOYAMA ON SOME 



diameter has the lower end of the phragmocone intact. The 

 transverse section of the rostrum is shghtly oblong. 

 Locality : — Hosonra. 



D. Fossils from Bed I. 



1. BAIERA? SP. 



PI. I. Fig. 2. 



This is a fan-shaped leaf wanting the upper end, l)ut l(wking 

 very much like the basal portion of either a Baiera or a 

 Phœnicopsis. Fine, longitudinal, simple veins constitute all that 

 can be observed in the leaf. 



Locality : — Hosoura-. 



2. CYRENA LUNULATA x. sp. 



PI. II. Fig. 9. 



Shell moderately thick, ovatelv triangular, slightly inequi- 

 lateral, subrostrated both in front and behind, with curved ventral 

 margin. Beaks prominent, touching, and directed forward. 

 Surface with fine but unequal concentric strise. In front of the 

 beak is an ovate lunula al)0ut twice as long as broad and bounded 

 l)y a fine deep groove running from the beak to the anterior 

 margin. Behind the l)eak there is a sharp keel running to the 

 posterior margin and enclosing a lanceolate valley-like area. 

 Proportions of length to height and thickness are as 10 to 8 to 4. 



The figured specimen measures about 25 mm. long, 20 mm. 

 high and 11 mm. thick, and may l)e taken as representing the 

 average size of the shell. 



Locality : — Ilosoura. Very numerous. 



