NO. 1205. 8YXOPS1S OF THK .V.I r.lDES SIMPSON. 561 



tLAMPSILIS DISPAR Lea. 



* Unio dispar LEA, Pr. Ac. X. Sci. Phila., IV, 1860, p. 305; Ml. Ac. X. Sci. Phila., 



IV, 1860, p. 327, pi. LI, tig. 153; *Obs., VIII, 1860, p. 9, pi. LI, tig. 153. *B. 

 H. WRIGHT, Check List, 1888. 



* Maryaron ( Unio) dispar LEA, Syn., 1870, p. 45. 



Southwest Georgia. 



(Group of Lampsilis amygdalum.} 



Shell rather small, obovate, inflated, 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 flue, 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 marsupiurn 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 amygdalum LEA, Desc. of 12 sp. Unioues, Aug. 19, 1843; * Tr. Am. Phil. Soc., 

 IX, 1846. p. 275, pi. xxxix, tig. 1; *Obe., IV, 1848, p. 33, pi. xxxix, fig. 1. 



* CONRAD, 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. * P^TEL, 

 Conch. Sam., Ill, 1890, p. 144.* SIMPSON, Pr. U. S. Nat. Mu., XV, 1892, p. 

 426, pi. LXVII, fig. 3.* CALL. Pr. Ind. Ac. Sci., 1896, p. 115. 



^Maryaron (Unio) amygdalum LEA, Syn., 1852, p. 39; 1870, p. 62. 



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



222. B. H. WRIGHT, Check List, 1888.* SIMPSON, Pr. U. S. Nat. Mua., XV, 



1892, p. 426, pi. LXVIII, fig. 1 ; LXIX, fig. 3. 

 * Margaron ( Unio) lepidns LEA, Syn., 1870, p. 39. 



Florida. 



tLAMPSILIS SUDUS Lea." 



*Unio concavus LKA, 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. Rec. Moll., II, 1857, p. 493. ^SOWERBY, Conch. 

 Icon., XVI, 1868, pi. xcn, fig. 504. *B. H. WRIGHT, Check List, 1888. 



* P/ETEL, Couch. Sain., Ill, 1890, p. 148. 



* Maryaron ( Unio) concavus LEA, Syn., 1852, p. 29; 1870, p. 46. 



t* Unio sndus LEA, 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, tig. 77. *B. H. 

 WRIGHT, Check List, 1888. 



''Margaron ( I'nio) sudus LEA, Syu., 1870, p. 46. 



Abbeville, South Carolina. 



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

 I have no doubt that both are the same species. 



2 The name concavns applied by Lea was, I believe, used previously by Zelebor for 

 what seems to be U. tnmidus. 



Proc. N. M. vol. xxii 36 



