NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 561 



tLAMPSILIS DISPAR Lea. 



* Unio dispar Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 305; *J1. Ac. N. Sci. Phila., 

 IV, 1860, p. 327, pi. LI, fig. 153; *Obs., VIII, 1860, p. 9, pi. li, fig. 153.— *B. 

 H. Wright, Check List, 1888. 



' Mar gar on (Unio) dis^jar LiEA, Syu., 1870, ]). 45. 



Southwest Georgia. 



(G-roLip of Lanipsilis amygdalum.) 



Shell rather small, obovate, iutiated, epidermis varying from smooth 

 and shining to somewhat cloth-like, ashy green to blackish, but always 

 showing green tints when seen through transmitted light, indistinctly 

 rayed; beaks rather high, sculptured with fine, parallel bars, arranged 

 in a double loop, that in front being large and rounded, that behind 

 small and rather pointed below; hinge teeth compressed; nacre irides- 

 cent behind. The greatest height of the shell is just behind the center; 

 its greatest diameter is just in front of it, or at a point just behind the 

 beaks ; the posterior end is often pointed and somewhat raised. Animal 

 with the marsupium large, reaching far below the inner gills, and having 

 a black border; inner gills united to the abdominal sac throughout; 

 anal opening smooth or only slightly crenulate. 



tLAMPSILIS AMYGDALUM Lea. 



Unio nmjigdalum Lea, Desc. of 12 sp. Uniones, Aug. 19, 1843; * Tr. Am. Phil. Soc, 

 IX, 1846. p. 275, pi. XXXIX, fig. 1; * Obs., IV, 1848, p. 33, pi. xxxix, fig. 1.— 

 *CoNHAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 244.— *H. and A, Adams, Gen., 

 Rec. Moll., II, 1857, p. 492.— *B. H. Wright, Check List, 1888.— " PiETEL, 

 Conch. Sam., Ill, 1890, p. 144.— * Simpson, Pr. U. S. Xat. Mus., XV, 1892, p. 

 426, pi. Lxvii, fig. 3.—* Call, Pr. Ind. Ac. Sci., 1896, p. 115. 



*Margaron ( Unio) amygdalum Lea, Syn., 1852, p. 39; 1870, p. 62. 



t* Unio lepidus Gould,' Pr. Bost. Soc. N. Hist., VI, 1856, p. 15; Otia Conch., 1862, p. 

 222.— B. H. Wright, Check List, 1888.—* Simpson, Pr. U. S. Nat. Mus,, XV, 

 1892, p. 426, pi. Lxviii, fig. 1 ; lxix, fig. 3. 

 * Mar gar on ( Unio) lepidus Lea, Syn., 1870, p. 39. 



Florida. 



tLAMPSILIS SUDUS Lea.^ 



*Unio concavus Lea, Tr. Am. Phil. Soc, X, 1852, p. 260, pi. xv, fig. 11; *Obs., V, 

 1852, p. 16, pi. XV, fig. 11.—* Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p.247.— 

 * H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 493. — ''Sowerby, Conch. 

 Icon., XVI, 1868, pi. xcii, fig. 504.— *B. H. Wright, Check List, 1888.— 

 *PyETEL, Conch. Sam., Ill, 1890, p. 148. 



* Margaron ( Unio) concavus Lea, Syn., 1852, p. 29; 1870, p. 46. 



t* Unio sudus Ij-ea, Pr. Ac. N. Sci. Phila., IX, p. 170; *J1. Ac. N. Sci. Phila., IV, 

 1859, p. 194, pi. XXI, fig. 77; * Obs., VII, 1895, p. 12, pi. xxi, fig. 77.— *B. H. 

 Wright, Check List, 1888. 



^Margaron ( Unio) sudus Lea, Syn., 1870, p. 46. 



Abbeville, South Carolina. 



'Having carefully compared the type of this, a large specimen, with amygdalum, 

 I have no doubt that both are the same species. 



*The name concavus applied by Lea was, I believe, i^sed previously by Zelebor for 

 what seems to be Z7. tumidus. 



Proc. K M. vol. xxii 36 



