NODULARIA 953 
pressed, the posterior one elongated; pallial line well marked; 
nacre brilliant, rose-tinted, iridescent. 
Length rio, height 31 mm. 
Phuc-son (Annam). 
Unio frithstorferi DAUTZENBERG, Jl. de Conch., XLVIII, 1900, 
p. 429.—-Bavay and Dautzrenserc, Jl. de Conch., XLIX, 
[GOL 5 plo u OSs. 1, 2: 
Lanceolaria friihstorferi Haas, Con. Cab. Unio, 1910, p. 50, 
pli.3, fig: 6, text he. 1 
This species is close to U. gladiolus and grayana, but is 
probably perfectly distinct. It differs from both of them in 
having a slightly arcuate outline, in being decidedly full at 
the post-basal region and in consequence having a much more 
blunt posterior point. The specimen referred to in a footnote 
on page 807 of the Synopsis, belonging to Mr. Bryant Walker, 
is no doubt this species. 
NopuULARIA BILIRATA von Martens. 
“Shell elongate, heavy, convex above, compressed below, 
mostly smooth except for the lines of growth; olive-brown, 
not shining; very shortly rounded in front; produced poste- 
riorly in a long beak, subacutely angled at the end, sculptured 
above with two. elongate, parallel lire, the lower the more 
prominent; dorsal margin slightly convex to the end of the lig- 
ament, then sloping gradually to the posterior point; ventral 
margin straight, slightly sinuous. Cardinal teeth sulcate on 
both sides, unequal, in the right valve the anterior is much 
compressed, small, the posterior heavy and broadly triangular ; 
in the left valve, the anterior is moderately compressed, small, 
the posterior broadly triangular; sinulus obsolete. Nacre 
white; anterior adductor impressions moderate, posterior very 
‘superficial. 
Length 79, height 25, diam. 17 mm. Beaks in from 1-5— 
1-6 of the length.” (von Martens). 
Type locality, Tonkin. 
Nodularia (Lanceolaria) bilirata von Marrens, Nachtr. 
Deutsch. Mal. Ges., 1902, p. 133.—DAuTzENBERG and Fiscu- 
ER). de“ Conch., WIE, 105; p. 204. 
