NOTES ON THE PALUDIXA-SPECTES OF JAPAN. 



37 



standing its variability; the species is easily distinguishable by the fol- 

 lowing characters : 



Shell pyramidal or turret-shaped, with apex sometimes extensively 

 worn out in mature specimens. Sutures deeply canal-like, owing to 

 the abruptly outstanding edges of whorls, between which edges 

 the whorl-surface is flat or even slightly concave. In some speci- 

 mens, each whorl is provided with two or three distinct, spiral 

 raised lines ; in others there is only one such line on the body-whorl, 

 bringing about an angle at the outer lip. The surface is either rough 

 and incrusted with a reddish substance or perfectly smooth and vividly 

 green. Height 43 — 51 mm. Diameter 23 — 30 mm. Aperture 18 — 25 

 mm. long, 14 — 19 mm. wide. 



Fig. 5 represents one of the youngest specimens of ingalhiana from 

 Lake Suwa. It will be seen that its shape is quite different from that 

 of the corresponding stage of either stelmapliora (fig. 3) or oxytropis 

 (fig. 9). 



This excellent species has hitherto been known only from Lake 

 Biwa, to which I will now add two more localities, Lake Suwa in 

 Prov. Shinano, and Nagoya in Prov. Owari, on the strength of the 

 specimens contained in the Imperial Museum. 



In Lake Biwa, it seems to be very common. Mr. K. MÂTS U UBA 

 incidentally obtained there several specimens, while collecting fresh- 

 water fishes together with Prof. C. Ishikawa during the summer of 

 1895. 



From Lake Suwa there was originally only one specimen of this 

 species in the Museum, liecently Mr. M. K A WATS UBA of that locality 

 has made a collection at my request and kindly sent me <i number of 

 fresh specimens. 



With respect to specimens from the Province of Owari, of which 

 there are three in the Museum, the exact locality is unknown. 



In the north-eastern provinces of Hondo, I could not obtain a 

 single specimen of this species, in spite of my efforts to collect during 

 the excursion of last summer. It is very desirable to ascertain its range 



