I'JQ Art. 1.— M. Yokoyama: 



Several examples, though mostly damaged on account of the 

 thin and fragile state of the shell. 



Fossil occurrence. — Otake, Shisui, Tega, Shito (ratlier 

 common). Shinagawa. Lower Musashino of Naganuma. 



Fossil occurrence. — Neogene of New Zealand. 



Living. — Northern and Central Japan. Philippines. New 

 South Wales. Panama. Bay of Caracas. 



290. Tjiètta suhaurieulata (Montagu). 



Lima suhavricuhda. Yokoyama, Foss. Miura Penin., p. 150, pi. XII, fig. 10. 



Lima aiuicidata. Weinkauff, Conch. Mittelm., II, p. 245, no. 7. Forbes and 

 Hanley, Hist. Brit. Moll., II, p. 263, pi. LIII, fig. 45. Wood, Crag. Moll., Biv., 

 p. 47, pi. YII, fig. 3. Homes, Moll. Tert. Beck. Wien, II, p. 889, pi. LIV, fig. 6. 

 Nyst, ConcL. Terr. Tert. Belg., p. 158, pi. XVIII, fig. 3. 



Pecten subaiiriculatus. Montagu, Test. Brit., Snppl., p. 65, pi. XXIX, fig. 2. 



Specimens are quite frequent. The largest obtained is a left 

 valve 8 millim. high, 4. Tmillim. long and 2. Smillim. deep. 

 The next largest is a right valve 7.6 millim. high, 4.4 millim. 

 long and 2.4 millim. deep. There seems to be a slight variation 

 in shape. The radiating costellae are distinct only in the median 

 line of the shell toward the ventral margin. 



Fossil occurrence in Japan. — Otake, Shisui, Tega, Sliito 

 (very common). Oji. Lower Musashino of Miyata. 



Fossil occurrence in Europe. — Pliocene of England, Belgium 

 and Italy. INIiocene of France, Austria, Hungary, etc. 



Living. — Mediterranean Sea, Britain, Norway, Greenland. 



291. Lima quatètoensis, Yokoyama. 



Lima qiiantoensi.s. Yokoyama, Foss. Miura Penin., p. 150, pi. XII, fig. 11. 



This shell first described by me from the Lower Musashino is 

 represented by several specimens which, however, are all young. 



Fossil occurrence. — Shito. Lower Musashino of Koshiba. 

 Living. — Central Japan. 



