528 
ZOOLOGY OF THE FAR EAST. 
Corbicula atrata Reinhardt. 
(Plate XXII, figs. 15. 16.) 
1877. Corbicula Leana, von Martens ( nec Prime, in Part ) op. cit., p. 119. 
1878. Corbicula fuscala var. atrata, Reinhardt. op. cU.. p. igi, pi, v tig. 4. 
1878. Corbicula Martensii, C. Reiniana. Clessin. op. cit., p.ig6, pi. XXXVIII, fi;j;s. 17, 18, 
and pi. XXXIX, figs; 8, 9. 
1879. Cyrena Martensii and Corbicula Reiniana. Kobelt. op. cit.. pj).. 441 442, pi. XX. tig. 5. 
This species was considered by Reinhardt to be a variety of C. fuscata 
Prime. Clessin rightly considered it to be distinct from the Chinese species, 
but without reason gave it the new name C. Martensi. He also described another 
shell of this species under the name C. Reiniana. 
Reinhardt' s description is fairly complete and accurate except for the sculpture 
and I, therefore, append the following note The young shells and half-grown 
individuals have the whole of the outer surface covered by rather fine, regular, 
concentric ribs, but in older specimens the sculpture becomes coarser and irregular. 
Normal shells are thick, and have a fairly strong hinge, but in other cases 
both the hinge and the shell, apparently through corrosion due to the saline nature 
of the water in which they are found become much thinner. This is well shown in a 
lot of shells collected by Mr. Fredrick Stearns and bearing the label "Yokohama 
Tide-flats." This series was lent to me for study by Herr H. Rolle of Berlin, and 
is interesting in that it shows a gradation in the thick and thin nature of the shells 
and the hinge. 
As noted above, both of Clessin 's species — martensi and reiniana — are based on 
specimens of atrata, and I see no justification for altering the name. 
Relationships : — The species is nearl}^ allied to C. leana Prime, but is distinguished 
by the shells being much smaller and thinner, more equilateral and somewhat rounded- 
trigonal, with a much weaker and narrower hinge and the ribs on the surface much 
finer and more closely set. 
Corbicula straminea, Reinhardt. 
(Plate XXII, figs. 17, 18.) 
1877. Corbicula straminea, Reinhardt, op. cit , p. 70. 
1878. Corbicula straminea, Reinhardt, op. cit. p. 186, p]. v, fig. i. 
1878. Corbicula straminea, Clessin, op. cit., p. 193, pi. xxxviii, figs. 9, 10. 
1879. Cyrena straminea, Kobelt, op. cit., p, 439, pi. xx, fig. 4. 
Pilsbry included this species doubtfully in the synonymy of C. leana Prime, 
because from the description and figures he could not find an}'^ material differences 
between it and the young shells of C. leana. I have examined shells of the type- 
series in the Berlin Museum and Dr. Reinhardt' s collection, and have compared them 
with the specimen figured by Clessin and now preserved in the Struttgart Museum. 
I have examined also a large series from Fushimi, Yamashiro, Central Japan collected 
by Lenz in 1895 and presented to the Hamburg Museum, and find m^yself unable to 
agree with Pilsbry's conclusions. Unfortunately Reinhardt' s figures of the species are 
