NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON, 811 



their sculpture irregularly radial; disks finely concentrically striate, 

 not otherwise sculptured; epidermis yellowish olive, cloth-like; pseudo- 

 cardinals greatly elongated, compressed, sometimes dentellate under the 

 beaks; laterals long, compressed. Animal unknown. 



fNODULARIA SAGITTARIA Lea. 



* I'nio Sagittarius LEA, Pr. Ac. N. Sci. Phila., VIII, 1856, p. 93 ; *J1. Ac. N. Sci. Phila., 



Ill, 1857, p. 298, pi. xxvi, fig. 12; * Obs., VI, 1857, p. 18, pi. xxvi, fig. 12. 



* Margaron ( Unio) Sagittarius LEA, Syn., 1870, p. 58. 



*tt7nio dugasti MORLET, Jl. de Concb., XL, 1892, p. 86; "XLI, 1893, p. 156, pi. \ i, 

 fig. 4.i 



Siam; Cambodia. 



(Group of Nodularia cter-ulea.) 



Shell elliptical, inflated, pointed about midway up behind, the post- 

 basal region produced, with a well developed posterior ridge; beaks 

 sculptured with numerous fine, radiating riblets, the central ones of 

 which join below, the whole often more or less zigzagged and extend- 

 ing well over the disk; epidermis generally bluish green. Animal 

 unknown. 



t NODULARIA C^RULEA Lea. 



* Unio cceruleiis LEA, Tr. Am. Pbil. Soc., IV, 1831, p. 95, pi. xm, tig. 25; *Obs , I, 



1834, p. 105, pi. xm, fig. 25. *HANLEY, Test. Moll., 1842, p. 194; *Biv. 



Sbells, 1843, p. 194, pi. xx, fig. 49. *CATLOWand REEVE, Concb. Nom., 1845, 



p. 56. *H. and A. ADAMS, Gen. Eec. Moll., II. 1857, p. 493. *CHENU, 111. 



Conch., 1858, pi. x vi, tigs. 3, 3a, 3&. "KUSTER, Concb. Cab. Unio, 1861, p. 228, 



pi. LXXVII, fig. 4. *SOWERBY, Couch. Icon., XVI, 1866, pi. XLII, fig. 230. 



*HANLEY and THEOBALD, Honch. Ind., 1876, p. 6, pi. xn, figs. 3, 3a. *!\*:TKL, 



Concb. Sam., Ill, 1890, p. 148. 



"Margarita ( Unio) cceruleus LEA, Syn., 1836, p. 26; 1838, p. 20. 

 * Margaron ( Unio) cteruleua LEA, Syn., 1852, p. 30; 1870, p. 47. 

 " Unio fjerMdoni EYDOUX, Guer. Mag., 1838, p. 9, pi. cxvm, figs. 2, 2a, 2b. *HANLKY 



and THEOBALD, Concb. Ind., 1876, p. 6, pi. xn, fig. 2. *P.ETEL, Conch. Sam., 



Ill, 1890, p. 153. 

 *iUnio substriatui LEA, Pr. Ac. N. Sci. Pbila., VIII, 1856, p. 93; * Obs., VI, 1857, 



p. 20, pi. xxvi, fig. 14 ; *J1. Ac. N. Sci. Phila., Ill, 1858, pi. xxvi, fig. 14. 



* Margaron ( Unio) substriatus LEA, Syn., 1870, p. 47. 



* t Unio 7i umilis LEA, Pr. Ac. N. Sci. Phila., VIII, 1856, p. 93 ; *Obs., VI, 1857, p. 16, 



pi. xxvi, fig. 10; *J1. Ac. X. Sci. Phila., Ill, 1858, p. 296, pi. xxvi, fig. 10. 

 *P.ETEL, Concb. Sam., Ill, 1890, p. 155. 

 *Margaron ( Unio) humilis LEA, Syn., 1870, p. 32. 



* Unio corrianus KUSTER, Conch. Cab. Unio, 1861, p. 229, pi. LXVII, fig. 5. 



* t Unio leioma BENSON, Ann. and Mag., 1862, p. 192. * HANLEY and THEOBALD, 



Concb. Ind , 1876, p. 6, pi. xn, fig. 6.* P.ETEL, Conch. Sam., Ill, 1890, p. 157. 



* t Uniopilatus LEA, Pr. Ac. N. Sci. Phila., X, 1866, p. 133; Ml. Ac. N. Sci. Phila., VI, 



1868, p. 281, pi. xxxvin, fig. 95 ; * Obs., XII, 1869, p. 41, pi. xxxvin, fig. 95. 



* \Margaron ( Unio) pilatus LEA, Syn., 1870, p. 47. 



* t Unio evitatus LEA, Pr. Ac. N. Sci. Pbila., X, 1868, p. 133 ; *J1. Ac. N. Sci. Phila., VI, 



1868, p. 279, pi. xxxvin, fig. 92 ; * Obs., XII, 1869, p. 39, pi. xxxvin, fig. 92. 



1 This group seems to stand iu part between section Lanceolaria and Nodularia. 



