﻿TRUNCILLA 31 



Unio Horentinus Lea, Pr. Ac. N. Sci. Phila., VII, T857, p. 83 ; 



Jl. Ac. N. Sci. Phila., V, 1862, p. 64, pi. v, fig. 213; Obs., 



VIII, 1862, p. 68, pi. V, fig. 213. 

 Margaron {Unio) florentinus Lea, Syn. 1870, p. 42. 

 Truncilla Uorentma Simpson, Syn., 1900, p. 524. 

 Unio tiirgidiihis Lea, Pr. Ac. N. Sci. Phila., II, 1858, p. 40; 



Jl. Ac. N. Sci. Phila., V, 1862, p. 62, pi. v, fig. 211; Obs., 



VIII, 1862, p. 66, pi. V, fig. 211. — Reeve, Conch. Icon., XVI, 



1864, pi. XVII, fig. 80. 

 Margaron {Unio) turgidulus Lea, Syn., 1870, p. 42. 

 Unio mix Kuster, Conch. Cab. Unio, 1861, p. 218, pi. lxxiii, 



fig. 2. 

 Unio sacculus Reeve, Conch. Icon., XVI, 1864, pi. xv, fig. 67. 



— Anthony, Am. Jl. Oonch., I, 1865, p. 157, pi. xii, fig. 3. 

 Unio saccatus Kuster, Conch. Cab. 1861, p. 263, pi. lxxxix, 



fig. 2. 



So far as I have seen the female shell is smaller than that of 

 the male. The male is more inflated than that of 7\ hiemar- 

 ginata, the angles of the posterior ridge are not quite so pro- 

 nounced nor is the radial depression so deep. Lea's Unio 

 turgidulus is the male and his florentinus the female of the 

 same species. 



Trunciixa deviata (Reeve). 



Shell rather solid, somewhat elongated, more or less inflated, 

 inequilateral ; beaks . high and full ; surface with irregular 

 growth lines ; epidermis yellowish-green with numerous, nar- 

 row, feeble rays ; pseudocardinals small, rough, subcompressed, 

 two in each valve ; laterals single in the right valve and double 

 in the left ; anterior scars small, impressed ; posterior scars 

 shallow ; nacre bluish-white, thinner and iridescent behind. 

 Male shell elliptical or ovate, the posterior ridge scarcely bi- 

 angulate. Female shell with high full beaks, narrowly round- 

 ed in front, with a large, rounded, subcompressed marsupial 

 swelling, which extends considerably below the rest of the basal 

 line and is often radially sculptured and grooved. It is some- 

 times darker than the rest of the shell. 



