ne ee 
THE NATURAL HISTORY SURVEY. 393 
Phil. Acad., Vol. V, p. 131, 1825, and must displace that of Lea 
published in 1834. 
‘ACRE 
11a. Unio gibbosus delicatus Simpson, pl. xv, figs. 2, 4. 
Unio gibbosus var. delicatus SIMPSON, Proc. U. S. Nat. Mus., Vol- 
XXII, p. 704, 1901. 
Differs from typical gzbdosus in being thin, greatly com- 
pressed and with an evenly elliptical outline and very dark nacre. 
p. 74. Anodontoides subcylindraceus is a variety of ferussact- 
anus. 
p. 79. Quadrula coccinea should be credited to Conrad, who 
described it in his monograph, p. 29, pl. xili, fig. 1, in 1836. 
Lea’s name not appearing until June 15,1838. (Vide Simpson, 
in letter.) 
p- 80. Quadrula plicata Lesueur should be credited to Say, 
who really described the species. (Unio plicata Say, Nich. 
Encyc., Vol. II, pl. iii, fig. 1, 1816.) 
p. 85. Quadrula verrucosa Barnes should be called Quad- 
rula tuberculata Rafinesque, the reference being Oddiguaria (Ro- 
tundaria) tuberculata Ra¥F., Ann. Gen. Sci. Brux., Vol. V, p. 103, 
1820. 
p. loo. The following species is distinct from anodontoides, 
which is figured on plate x, figs. I, 2. 
150. Lampsilis fallaciosus (Smith) Simpson, pl. x, fig. 3. 
Lampsilis fallaciosus SMITH, Bull. U. S. Fish Com., 1899, p. 291, pl. 
lxxix. 
Figured and name given, but not described nor authority given. 
Lampsilis fallaciosus (Smith) Simpson, Proc. Phil. Acad., p. 74, pl. ii, 
fig. 5, 1900. 
“Shell elongate elliptical, subsolid, inflated, rounded in 
front, and ending in a rather sharp point behind, at two-thirds 
the height of the shell, with a moderate, rounded posterior 
ridge; beaks not prominent, their sculpture consisting of a few 
delicate parallel ridges, somewhat doubly looped, the hinder 
loops generally open behind; epidermis very smooth and shin- 
ing, ashy straw color, often brownish on the back of the shell, 
generally feebly rayed with green; female shell decidedly 
swollen in the postbasal region, so that the base line is often 
incurved in front of the swelling; teeth rather delicate, there 
being one compressed pseudo-cardinal and one lateral in the 
right valve, and two pseudo-cardinals and two laterals in the 
left; beak cavities not deep; nacre brilliant, silvery.” 
“Length, 90; height, 40; diameter, 32 mill.” 
