QUADRULA 891 
QUADRULA KIRTLANDIANA (Lea). 
Shell large, subrhomboid or subelliptical, subcompressed or 
convex, inequilateral, solid; beaks moderately full and high; 
posterior ridge varying from low to somewhat elevated, often 
widely double, ending near the base of the shell in a wide, 
feeble biangulation ; anterior end rounded, often slightly trun- 
cate above; base line usually curved; outline of dorsal slope 
usually having the angle behind the ligament; surface irregu- 
larly, concentrically sculptured ; epidermis yellowish-green with 
broken rays when young, becoming greenish-brown, brown or 
blackish and rarely raved. when adult; pseudocardinals radially 
striate; lateral of right valve partly double; beak cavities 
deep, compressed; muscle scars well marked; pallial line re- 
mote in front; nacre white, rarely lurid, porcellaneous, thinner 
behind. 
Length 120, height 8&, diam. 45 mm. 
Length 126, height 88, diam. 42 mm. 
Ohio, Cumberland, and Tennessee River systems ; southwest 
to Arkansas; north to Wisconsin?; east through southern 
Michigan. 
Type locality, Mahoning River, O. 
Unio kirtlandianus Lea, Tr. Am. Phil. Soc. V, 1834, p. 98, pl. 
xiv, fig. 41; Obs., I, 1834, p. 210, pl. xiv, fig. 41.—HANLEY, 
Biv. Shells, 1843, p. 203, pl. xx1u, fig. 27-KusteEr, Conch. 
Cab. 1856, ps 165, pl. xiix, fies. 2,35 1861,.p. 214, pl. txx1, 
fig. 1.—SoweErBy, Conch. Icon., XVI, 1868, pl. Lxxvit, fig. 
402. 
Margarita (Unio) kirtlandianus Lea, Syn., 1836, p. 34; 1838, 
Pp. 23. 
Margaron (Unio) kirtlandianus Lea, Syn., 1852, p. 35; 1870, 
p. 56. 
Quadrula kirtlandiana Simpson, Syn., 1900, p. 791. 
Fusconaja kirtlandiana OrtMANN, Ann. Car. Mus., VIII, 
ROU 2:p:. 245; 
Unio kirklandianus HANiEy, Test. Moll., 1842, p. 203. 
