NODULARIA 955 
“Near to the Chinese V. grayana lea in form, but without 
the V-shaped sculpture.” 
Dautzenberg and Fischer, (1. c.), express the opinion that 
this is the same as N. friihstorfert. 
NoODULARIA GLADIOLUS (Heude). 
Shell greatly elongated, solid, inflated, inequilateral, poste- 
rior ridge strong, elevated, somewhat rounded, ending behind 
in a point at or below the median line, sometimes turned down- 
ward or to one side; umbonal region subcompressed ; surface 
-with more or less faint, subvertical folds, and strong, irreg- 
ular growth lines ; epidermis coarse, rough, brownish; pseudo- 
cardinals something like those of grayana, but stronger and 
rougher: laterals elongate, strong; muscle scars well impress- 
ed, the hinder elongated; behind the laterals there is in each 
valve a decided, elongated callus; nacre dull, flesh-color or 
purplish. 
Length 110, height 30, diam. 20 mm. 
China. 
Unio gladiolus Heupr, C. Fluv. Nank., II, 1877, pl. xv, fig. 35. 
Nodularia gladiolus Stmpson, Syn., 1900, p. 807. 
Lanceolaria gladiolus Haas, Con. Cab. Unio, 1910, p. 47, pl. 
ae ies 2: 
Closely related to N. grayana, but a larger, solider, ruder 
species. The posterior ridge is not so sharp, there are, appar- 
ently, no strong, concentric ridges on the anterior end, the epi- 
dermis is rougher than in grayana and the nacre is far more 
dull. The posterior calluses in the nacre of this species are 
strongly developed and show traces of reticulation, these be- 
ing feeble in the nearly allied N. grayana. ‘These peculiar 
growths, the twisting and bending of the posterior end of the 
shell and the vertical striation of the teeth are characters com- 
mon to many apparently wholly unrelated forms of Unionide 
found in Chinese waters, and with the singular inequality 
caused by one valve being pushed over the other, seen in many 
Ouadrulas, may be the result of some peculiarity of their en- 
vironment. According to Bavay and Dautzenberg this species 
attains a length of 160 millimeters. 
