SOME TERTIARY FOSSILS FE03I THE MIIKE COAL-FIELD. 7 



3. Perna Nishiyamai n. sp. 



PL I. Figs, la, lb. 



Shell moderately large, flattened, irregularly oval, longer 

 than wide. Hinge-line straight, making an obtuse angle with 

 the anterior as well as with the posterior margin ; anterior 

 margin somewhat concave, provided with a deep elongated 

 byssal notch ; lower margin almost semi- circular ; posterior 

 margin broadly rounded. Surface smooth with more or less 

 distinct lines of growth. 



The single specimen that we 2:>ossess is 72 millim. high, 

 63 millim. broad and 20 millim. thick. 



The depth at which the shell was found was 625 feet. 



4. Pholadomya margaritacea (Sow.). 

 PI. I. Fig. 4. 



Pholadomya margaritacea Moesch. Monographie der Pholadomyen, p. 119, 

 pi. XXXVII, figs. 6, 8, pi. XXXIX, figs. 1-6. 



Pholadomya KonincH Nyst. Descrip. Coq. Foss. et Polyp. Terr. Tert. 

 Belgique, p. 50, pi. I, figs 9. Deshayes. Descrip. Anim. sans Vert., vol. I, p. 

 278, pi. IX, figs. 11-14. 



Cardita viargaritacea Sowerhy. JNIiueral Conchology, vol. Ill, ^. 175, \)\. 

 297, figs. 1-3. 



There is a greatly deformed specimen of Pholadomya from 

 Miike which on careful examination appears to belong to the 

 same species as that of Sakasegawa in Amakusa (figs, oa, 3b, 

 pi. I) and Kawachidani in Echigo (fig. 2a, 2b, pi. I). Now 

 on comparing these specimens with the Pholadomyas hitherto 

 found in Europe, their sphenoid shape, prominent beak, and 

 abruptly ending nearly perpendicular anterior side seem to show 



