NODULARIA g6I 
Unio pictorum var. longirostris \WWESTERLUND, Kong so. vet. 
Ak. Hand, XIV, No. 12, p. 74. 
Unio schrencki WrSTERLUND. Where described? 
Unio abbreviatus \VESTERLUND. Where described? 
An abundant and variable form, which has received a num- 
ber of names. Some of the forms are probably worthy of va- 
rietal distinction. ‘The general form is much like that of 
Lampsilis subrostrata of Say, but all the shells appear to have 
a post-basal swelling. It is probable that the Unio pictorum, 
which Westerlund credits to Amurland, is a form of this. The 
sculpture sometimes extends well over the disk. 
Var. shanghaiensis (Lea). 
Shell smooth, usually quite dark, and larger than the typi- 
cal form. 
Length 67, height 30, diam. 23 mm. 
China; Eastern Siberia; Japan. 
Umo shanghaiensis Lea, Pr. Ac. N. Sci. Phila., III, 1859, p. 
Peas lene. JN.ock Phila. V5.1860; pi 242, pl. xxxvi,'fig. 
121; Obs., VII, 1860, p. 60, pl: xxxvi, fig. 121.—REEVE, 
Conch. Icon., XVI, 1865, pl. xx1, fig. 96. 
Nodularia douglasie var. shanghaiensis SIMPSON, Syn., 1900, 
p. 808.—Haas, Con. Cab., Unio, 1910, p. 71, pl. vu, fig. 1. 
Unio pictorum var. amurensis Mousson, J. de Conch., XX XV, 
Eoo7, p. 26, pl. 1, fic. &. 
Sometimes no larger than typical form, but smooth and 
darker. 
Var. nipponensis (von Martens). 
A rather small, dark form, either nearly smooth or having 
considerable sculpture on the disk. I have seen shells from 
Japan, which are nearly smooth and as large as any specimens 
of shanghaiensis. 
China; Amurland ; Japan. 
Unio nipponensis voN Martens, S. B. Nat. Fr., 1877, p. 119. 
—Kose.t, Abh. Senck. Nat. Ges., XI, 1879, p. 422, pl. xu, 
fie.2: 
Nodularia douglasie var. nipponensis Stmpson, Syn., 1900, p. 
809.—H as, Con. Cab., Unio, 1910, p. 72, pl. vit, figs. 2, 3. 
