On Some Fossil Shells from the Island of Saishu. 9 



ed, smooth on surface, punctate in structure and with the dorsal 

 valve only a little shallower than the ventral. The beak is pro- 

 duced, incurved and truncated by a small round foramen separat- 

 ed from the hinge-line by a deltidium consisting of two pieces. 

 Height 25,5 millim. Breadth 19 millim. Thickness 5.3 millim. 



This shell looks like an elongated form of Terebratella coreanica 

 (Davidson's Monograph, pi. XIII, fig. 8), though thicker with the 

 beak more pointed and the foramen smaller. It is also not unlike 

 a fossil which I described from the Lower Musashino of Koshiba 

 (Foss. jNIiura Penin., pi. XIX, fig. 27) under the name of T. nijj- 

 poneîisls, though tlie foramen is smaller. 



On account of the extreme difficulty in determining this class 

 of shells from a few examples, especially when we are not able to 

 disclose the internal characters, I leave the shell unnamed. And 

 so also the next one. 



27. KndesiaÇ?) sp. 

 (PI. I., Figs. 7, 8.). 



This is a more roundish form than the preceding, although in 

 itself it is somewhat longer than broad. There are three speci- 

 mens, two of which have been figured. These seem to belong to 

 the same species in spite of the smaller one being more pointed 

 behind. The surface is perfectly smooth, the magnifying-glass, 

 however, revealing its punctate structure. Mesial fold hardly 

 developed. The beak is much produced, incurved and provided 

 with a small foramen at the summit. Deltidium consisting of two 

 pieces. 



The larger of the figured specimens measures 27.6 millim. in 

 height 24.7 millim. in breadth and 16 millim. in thickness, while 

 the smaller is 23 millim. high, 20.5 millim. broad and 11 millim. 

 thick. 



The shell shows some distant resemblance to Eudesia Icnticu- 

 la7'is (Deshayes) living and fossil (Pleistocene) in New Zealand 

 (Davidson's Monograph, p. 52, pi. IX, figs. 2-13). 



Published January 24th, 1928, 



