8 ART. 6. — M. YOKOYAMA ON HOMiù 



3. BELEMNITES sp. 



PI. II. Fig. 12. 



A single specimen. It is provided witli a part of the 

 pliragmocone and is lanceolate in shape, measuring about 37 mm. 

 in length, and about 7 mm. in breadth near the upper end, 

 reminding one of Belemnites acutus Miller of the Lias. However 

 the preservation is such that a strict specific determination is at 

 present impossible. 



Locality : — Hosoura, in a sandy clay slate. 



C. Fossils from Bed IV. 



1. TRIGONIA V-COSTATA Lycett. 



PL II. Figs. 2, 3, 4. 



Lycett. A Monograph of the British Fossil Trigoniœ, 

 p. m, pL XIII fig. 5, pi XVI fig- 1-4. 



A Trigonia lielonging to the group of Undulatseand present 

 in numerous specimens coincides so well in its characters with 

 the species above named from England that I have not the 

 slightest doubt about the identity of the two forms. The most 

 important character of the species lies in the formation of a 

 V-shaped angle by the meeting of the subtuberculated anteal and 

 posteal ribs near tlie carina. This angle which is particularly 

 distinct near the ventral margin of the shell gradually passes 

 into a curve towards the })eak. 



Most of our specimens are small, being about the size of those 

 figured as smaller ones by Lycett. Fig. 4 shows the inner 



