72 ART. 2. — S. TOKÜNAGA. 



MYLIOBATIS Sp. 



PI. VI. Fig. 1. 



A part of a tooth of ray-fish was found at Tabata by Prof. 

 YoKOYAMA. It is one of those flat, rectangular plates, which, 

 when tlie tooth is perfect, are placed close together, united by 

 suture, and laterally adorned with many small rhombic plates, 

 so as to form a kind of mosaic pavement on both the upper 

 and lower jaws. Our plate measures 30°"" in length, 5.i5"'"' in 

 thickness. The inner surface is furnished with twenty-eight 

 ridges and furrows. 



The shape of the plate resembles that of the Japanese 31. 

 cornuta Gthr. found in the sea near Rikuzen and Hizen. But 

 the latter, in which the head is ô*^"", the trunk 24.5^™ and the 

 tail 35'"™ long, and which is probably one of the largest forms, 

 a dental plate of only 14'""^ in length, 3.5™'" in width and 2™'" 

 in thickness. 



ELEPHAS ANTIQIUS Falc. 

 PI. VI. Figs. 2-G. 



Naumann, Jap. Elephant der Vorzeit, 1881, p. 25. — Brauns, Geol. 

 Env. Tokio, 1881, p. 24. — Brauns, Ueber Jap. Dil. Saugethiere 

 (Zeitschr. deuts. geolog. (Tesells., I., 1883). — Roger, Vez. bischer 

 bekannten fossilen Saugethiere (Naturw. Vereins Schwaben and 

 Neuburg. Augsburg, 1896). — Falconer, Pjilngontologieal Memoirs, 

 Tl., p. 147. — Falconer and Cautley, Fauna antiqua Sivalensis. 



Synonym : — E. namadicus Falc. and Caut. 



This interesting fossil mammal was dug out, in the year 

 1898, from the lower part of a bluish clay at Tabata. The 

 specimens consist of two molar teeth (PI. VI. Figs. 2-5) and a 

 splendid tusk (PL VI. Fig. 6.) which are now in the Imperial 



