970 NODULARIA 
Unio japanensis KopeLt, Abh. Senck. Nat. Ges., XI, 1879, p. 
AB2s Pls ily Mies: ue 
Unio jokohamensis von IwertInc, Abh. Senck. Nat. Ges., 
XVI 18o3epe rss: 
Nodularia japanensis var. jokohamensis Stmpson, Syn., 1900, 
p. $10.—Haas, Conch. Cab., Unio, 1910, p. 87, pl. vai, 
figs. 9-13. 
NODULARIA HACONENSIS (von Ihering). 
Shell rhomboid elliptical, convex, inequilateral, subsolid, 
rounded in front, slightly curved on the base line and but little 
produced at the postericr base; obliquely subtruncate on the 
posterior slope; posterior ridge low, often with a slight ten- 
dency towards being double; surface more or less strongly, 
concentrically sulcate, showing faint traces of nodular sculp- 
ture on the middle of the disk; epidermis dirty tawny or 
brownish, somewhat cloth-like; pseudocardinals rather strong, 
rough, not split into dentillations; laterals well developed, 
curved; beak cavities well impressed; muscle scars well mark- 
ed; nacre dirty, lurid brownish or lead-colored. 
Length 47, height 28, diam. 16 mm. 
Japan. 
Unio haconensis VON IHERING, Abh. Senck. Nat. Ges., XVIII, 
T8035 p., LOlasie-h3. 
Nodularia haconensis Stmpson, Syn., 1900, p. 810.—HAas, 
Con, ‘Cab. (Unio, 1910, sp. SO) pli, ossar=3. 
Close to N.. japanensis and possibly a variety of it, but dif- 
fering in having well marked, concentric sculpture, in being 
almost destitute of nodules and having a pale brownish or 
tawny epidermis. 
NopuULARIA BRANDTII (Kobelt). 
Shell rather short, elliptical or rhomboid elliptical, very solid, 
subinflated, inequilateral ; dorsal outline almost evenly curved ; 
basal outline curved; posterior ridge moderate, ending below 
the median line in a dull point ; anterior end rounded; surface 
with irregular growth lines, blackish-olive; beaks prominent ; 
