NOTES ON THE PALUDINA-SPECIES OF .JAPAN. 



91 



iters of the typical oxytropis with those of either Sciatevi or japonica. 

 Adults with the characters of typical oxytropis are not found in this lot. 



In fig. 14 I have represented a specimen from this locality, which 

 must certainly he considered as Sciatrri. In its general shape, the form 

 of the aperture and the nature of raised lines, it tallies well with the 

 description and figures given by Kopelt of that form. 



Fig. 17 represents a specimen from the same locality, which is a 

 true japonica characterized by outbulged whorls, by the expanded outer 

 lip of the aperture and by the partial absence of raised lines. The 

 young specimen drawn in fig. 9 was taken from this individual. 



As examples of varieties with combined characters, I have given 

 figures of three specimens in figs. 13, 15, and 10. Both the specimens 

 of figs. 13 and 1(3 have almost the shape of Sciatrri, but at the same time 

 approach oxytropis in the character of raised lines, which is especially 

 the case with the specimen of fig. 13. 



The individual of fig. 15 is nearly oxytropis in its general shape, but 

 the raised lines have all disappeared except one on the body-whorl, in 

 which respect it is like japonica. 



I wish to emphasize once more that the young of all the varieties 

 above mentioned are essentially oxytropis in character, so that figs. 8 — 11 

 might pass as young stages of any one of them. Here is, I think, 

 a sufficient ground to conclude that Pat. oxytropis represents the ances- 

 tral species whence the several varieties have arisen. 



