Mollusca of the Tai-Hu. 
Specimens from the Tai-Hu agree well with Lea's original figure. They are con- 
siderably smaller than some from Shanghai in the collection of the Indian Museum. 
The measurements of a large shell from the lake are loo x 65 x 36 mm. The inner 
margin is pale olivaceous, the epidermis dark olivaceous. 
A. woodiana is common in creeks with the two species of Nodulana. The Poly- 
zoa Paludicella elongata and Hislopia cambodgiensis are often found on living shells 
and the leech Hemiclepsis casmiana, Oka ' is parasitic on the animal. 
Genus Nodularia, Conrad. 
Nodularia dactylina (Heude). 
1895. Unio dactylina, Heude, Conch. Fluv. Nanking, pt. IX, pi. Ixv. 
1900. Nodularia douglnsiae (ia part) Simpson, Proc. U.S. Nat. Mux., XXII, p. 808. 
1910. Nodularia douglasiue, Haas, Unioniden in Chemnitz's Conch.-Cab., (ed. Kobelt), p. 68 (in 
part), pi. vi, fig. 5. 
Haas treats both this and the succeeding species as mere " formae " of A'', doug- 
lasiae (Griff, and Pidg.) and Simpson refers to it as possibly worthy of a varietal name, 
but as the two occur together, are seemingly constant, without intermediate speci- 
mens, I think it better to regard them as distinct. Specimens from the Tai-Hu agree 
well with Haas's figure. Our largest shell is 64 mm. long, 30 mm. deep and 23 mm. 
thick. 
A^. dactylina is common, with N. douglasiae, in shallow creeks and channels at the 
edge of the Tai-Hu and between islands in the lake. It is recorded from Ningpo. 
Nodularia douglasiae (Griff.). 
1845. Unio osbecki, Philippi, Zeits. Mai., p. 164. 
1910. Nodularia douglesiae, Haas, op. cit., p 68 (in part), pi. vi. figs. 6, 7. 
Specimens from the Tai-Hu agree well with Haas's fig. 6, but are larger, the 
measurements of a well- developed .shell being 51 mm. x 25 mm. x 15 mm. The 
species is as common as N . dactylina. It is said to be found in Central China. The 
leech Hemiclepsis casmiana, Oka ' was found parasitic upon it also. 
Family CYRENIDAE. 
Genus Corbicula, Megerle. 
Corbicula sandai, Reinhardt. 
1878. Corbicula Sandai, Reiuhard, Jahrb. Malak. Gesell., V, p. 187, pi. v, fig. 2. 
1881. ? Corbicula largillierti, var., A. Heude, op. cit., pi. i, fig. la. 
1907. Corbicula Sandai, Pilsbry, Annot. Zool. Japon., VI, p. 157, pi. vii, figs. 17, 18. 
1916. Corbicula sandai, Annandale, Mem. As. Soc. Bengal, VI, p. 51, pi. iii, fig. 12. 
Shells from the Tai-Hu seem to belong to this species, the hinges and teeth being 
quite characteristic. They exhibit, however, considerable variation in outline and 
are all small and more or less eroded. The relative lengths of the lateral teeth are 
somewhat variable. 
' Oka, Mem. As. Soc. Bengal, VI, p. 167 (1917V 
