ON JAPANESE SPECIES OF CORBICUI.A. 



155 



Corbicula leana Prime. (Plate VII, fig. 5, 6.) 



C. Ivana Prime, Ann. Lyc. Nat. Hist, of New York, VIII, p. 68 (Japonia). 

 C. reiniana Clessin, Conchylien Cabinet, Cycladeen, p. 196, pi. 39, f. 8, 9 

 (Yokohama). 



? C. straminea Reinhardt, Jahrb. d. Malak. Ges. V, 1878, p. 186, pl. 5, f. 1 

 (Hakoiie Lake). 



? C.pexata Reinh., I.e. p. 193, pi. 5, f. 6. Kobelt, Fauna, p. 156, pi. 20, 

 f. 2. 



This common and wide-spread species may be recognized by its 

 coarsely sculpture nymphs (see the woodcut), coarse ribs of the exterior, and 

 triangular-oval shape. It varies from yellow or greenish yellow in young 

 and half-grown shells, to black in old ones, and the interior is violet. 

 The specimens before me are from the following localities. 



Hondo : Shinainuma, Rikuzen ; Kasumigaura, Hitachi ; Tokyo and 

 Niisomura, Musashi ; Gifu, Mino ; Kahokugata, Kaga ; Koyamaike, 

 Inaba ; Osaka and Shikanjima, Osaka, Idzumi. 



Shikoku : Kotohira, Sanuki. 



Kyûshû : Saga, Hi/.en ; Yanagawa, Chikugo ; Kagoshima and Sen- 

 daigawa, Satsuma. 



Part of the hinge of the left valve of Corbicula leana, showing the brol en ligament L, and 

 the nymph A'. 



The specimens from Satsuma are all small, those apparently adult 

 measuring 20 to 24 mm. long. In Hizen they are also small, not exceed- 

 ing 25 mm. long ; but some localities in the north also supply equally 

 small shells. In many places, as around Osaka, they grow to a length of 

 30 to 40 mm. 



