ZOOLOGICAL RESULTS OF A TOUR IN THE FAR EAST. 
REVISION OF THE JAPANESE SPECIES OF THE GENUS CORBICULA. 
By B. Prashad, D.Sc, Officiating Director, Zoological Survey of India. 
Pilsbry in 1907 published a monograph dealing with the Japanese species of the 
genus Corbicula, Meg. V. Miihlfeldt, but was not able to deal with a number of species 
from around Yokohama described by various European authors. His treatment of 
some of the other species was also questioned by Annandale when describing the 
molluscs of Lake Biwa. While on study leave in Europe in 1922 I took the oppor- 
tunity of examining as many of the original series and types of Japanese species of 
the earlier authors as were available for examination, and the results of this study 
are here presented. 
Of the various collections examined, I would specially note the types and other 
specimens in the British Museum (Natural History) London, the Berlin Museum, 
where the types of von Martens and most of the specimens named by Reinhardt are 
preserved, the Struttgart Museum containing the Clessin collection, and the Sencken- • 
berg Museum, Frankfurt-a-Main, containing the collections of the Deutsche Malako- 
zoologische Gesselschaft, Boettger, Kobelt and Moellendorf. In addition I had the 
opportunity of studying the large collections in the Hamburg Museum, and the private 
collections of Dr. O. Reinhardt and H. RoUe of Berlin. For the courtesy shown me 
and the facilities given for studying the collections under their respective charges my 
best thanks are due to Dr. J. Thiele, Dr. O. Buchner, Dr. F. Haas, Dr. E. Degnerand 
Mr. G. C. Robson. In addition I also had for my examination the collection made by 
the late Dr. N. Annandale in Japan in 19 15, and I am greatl}^ indebted to him for 
valuable suggestions made by him before his sad death. 
After the paper was written I received a very valuable lot of paratypes and 
duplicates of Japanese Corbiculas from Dr. H. A. Pilsbry of Philadelphia, and as a 
result of their examination I am able to fully confirm the results I had arrived at from 
my study of Dr. Pilsbry' s descriptions and figures. I have to express here my great 
indebtedness to Dr. Pilsbry for his generosity in sending me these specimens for the 
Indian Museum. 
Corbicula transversa von Martens. 
1877. Corbicula transversa, von Martens, Sitzimgsber. Ges. Naiur. Freunde Berlin, p. 120. 
1877. Cyrena Yokohamanensis, SowerVjy, Conch. Icon. XX, pi. xii, fig. 55. 
1878. Corbicula ovalis, Reinhardt {nec Prime), Jahrb. deiitsch. Malak. Ges. V, p. 192 pi. v, fig. 5. 
1878. Corbicula transversa, C. Doenitziana, Clessin, Martini and Chemn. Conch.-Cab. Cyclddeen, 
pp. 195, 197, pi. xxxviii, figs. 13, 14 and pi. xxxix, fig. 4. 
1879. Cyrena transversa, Corbicula Doenitziana, Kobelt, Abh. Senck. Nat. Ges. XI, pp. 440, 442, 
pi. xxi, fig. 2. 
