NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 563 



p. 492.— *GouLD,Otia. Conch., 1862, p. 197.— B. H. Wright, Check List, 1888.— 

 *PiETEL, Conch. Sam., Ill, 1890, p. 162.—* Simpson," Pr. U. S.Nat. Mus., XV, 

 1892, p. 427, pi. Lxviii, fig. 2. 

 Margaron ( Unio) papyraceus Lea, Syn. 1852, p. 38; 1870, p. 62. 



Everglades, Florida. 



tLAMPSILIS SINGLEYANUS Marsh.' 



* Vnio singleyanus Marsh, Joliet Weekly Jsews (a newspaper), May 1, 1891 ; *Naa- 



tilus, V, 1891, p. 29.— * Simpson, Pr. U. S. Nat. Mus., XV, 1892, p. 426, pi. 

 LXVIII, figs. 4, 5. 



PutDam and Sumpter counties, Florida. 



Subgenus CARTJNCULINA Simpson in Baker, 1898.2 



(Type, Cnio fexasensis Lea.) 



Shell small, inflated, obovate, rather solid, covered with a thick, dark, 

 often cloth like epidermis, which is rayless or only feebly rayed; beak 

 sculpture consisting of rather strong, concentric ridges, which form, as 

 a general thing, only a single, rounded loop in front, and are strongly 

 « urved upward behind.' Pseudocardiuals compressed, smooth on the 

 inside, generally reflexed upward, somewhat torn on the edges. Shell 

 (juite commonly pointed posteriorly, that of the female truncated 

 obliquely on post base. Animal with the marsupium consisting of a 

 few large ovisacs (8 to 13); inner gills wholly or in part free from the 

 abdominal sac; female often having a well-developed caruncle on the 

 mnntle below the branchial opening. 



tLAMPSILIS TEXASENSIS Lea. 



* Unio parvus Conrad, Mouog., II, 1836, p. 20, pi. ix, fig. 1. — "Hanley, Biv. Shells, 



1843, p. 196, pi. XXII, fig. 3.— 'SowEKBY, Conch. Icon., XVI, 1866, pi. xxxv, fig. 



186. 

 "* Unio texasensis Lea, Pr. Ac. N. Sci. Phila., VI, 1857, p. 84; "^Jl. Ac. N. Sci. Phila., 



IV, 1860, p. 359, pi. LXi, fig. 184; *^Obs., VIII, 1860, p. 41, pi. lxi, fig. 184.— 



" SowERBY, Conch. Icon., XVI, 1866, pi. xl, fig. 218.—* B. H. Wright, Check 



List, 1888.— "P.ETEL, Conch. Sam., Ill, 1890, p. 161.— * Call, Pr. Ind. Acad. 



Sci., 1896, p. Ill, pi. V, figs. 38-40. 

 ^Margaron ( Unio) texasensis Lea, Syn., 1870, p. 49. 

 t ^ Unio hairdianns LEA,*Pr. Ac. N. Sci. Phila., 1, 18.57, p. 102 ; * Jl. Ac. N. Sci. Phila., 



IV, 1860, p. 361, pi. lxi, fig. 186; ^Obs., VIII, 1860, p. 43, pi. lxi, fig. 186.— 



*B. H. Wright, Check List, 1888. 

 ^Margaron ( Unio) hairdianits Lea, Syn., 1870, p. 49. 



' This may belong to the parvus group. The beaks of specimens I have examined 

 were badly eroded. 



- Erroneously spelled Corunculina. 



■^ Occasionally there is a vestige of a i)osterior loop, and I have seen it perfectly 

 developed, especially in specimens of L. haleianus. The beak sculpture of this group 

 is remarkably like that of the Tetralasmus group of Unio, though the two assem- 

 blages are not at all closely related. 



^ A rather delicate variety, but I hardly think -worthy of a varietal name. The 

 sijecies varies from being quite slender to short, wide, and inflated. 



