NO. 1205. SYNOPSIS OF THE NAIADES ^IMI'SON. 563 



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

 *PYETEL, 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. 1 



* Cnio sinyleyanus MARSH, Joliet Weekly News (a newspaper), May 1, 1891 ; *Nau- 



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

 LXVIII, figs. 4, 5. 



Putnam and Sumpter counties, Florida. 



Subgenus CAKTJNCULINA Simpson in Baker, 1898. 2 

 (Type, Unio texasensis 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 

 curved upward behind/ 1 Pseudocardinals compressed, smooth on the 

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

 quite commonly pointed posteriorly, that of the female truncated 

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

 tew 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 

 mantle below the branchial opening. 



tLAMPSILIS TEXASENSIS Lea. 



* Unioparvus CONRAD, Monog., II, 1836, p. 20, pi. ix, fig. 1. *HANLEY, Biv. Shells, 



1843, p. 196, pi. xxn, fig. 3. *SOWERBY, Conch. Icon., XVI, 1866, pi. xxx v, fig. 

 186. 



* Unio texasensis LEA, Pr. Ac. N. Sci. Phila., VI, 1857, p. 84; *J1. 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. 



*Maryaron ( Unio) texasensis LEA, Syn., 1870, p. 49. 



t * Unio bairdianxs LEA, 4 Pr. Ac. N. Sci. Phila., 1, 1857, 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) bairdianns LEA, Syn., 1870, p. 49. 



1 This may belong to the parr us group. The beaks of specimens I have examined 

 were badly eroded. 



- Erroneously spelled Corimculina. 



"Occasionally there is a vestige of a posterior loop, and I have seen it perfectly 

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

 is remarkably like that of the Tetralaamits 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 

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



