NO. 1205. SYXOPSIS OF THE NAIADES— SIMPSON. 857 



LAMELLIDENS SCUTUM Sowerby. 



* TTnio scutum Sowkkby, Coiicli. Icon., XVI, 1868, pi. xciv, fig. 510.'— ~* Hanley 



and Theobald, Conch. Incl., 1876, p. 22, pi. xlvi, fig. 1. — *P^tel, Conch- 

 Sam., Ill, 1890, p. 167. 



Tenasserim. 



t LAMELLIDENS CORRIANUS Lea. 



* Unio corrianus Lea, Tr. Am. Phil. See, VI, 1834, p. 65, pi. ix, fig. 25; ' Obs., I, 



1834, p. 177, pi. IX, fig. 25.—* Hanley, Test. Moll., 1842, p. 207; '^ Biv. Shells, 

 1843, p. 207, pi. XX, fig. 60. — "^ Catlow and Eeeve, Concb. Nom., 1845, p. 

 57.— *H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 491. — * P.etel, Conch. 

 Sam., Ill, 1890, p. 149. 



* Margarita {Unio) corrianus Lea, Syn., 1836, p. 38; 1838, p. 25. 

 *" Margaron {Unio) corrianus Lea, Syn., 1852, p. 38; 1870, p. 61. 



India; Burma; Pegu, 



t LAMELLIDENS GENEROSUS Gould. 



*Unio generosus Gould, Pr. Post. S. N. Hist., II, 1847, p. 220; * Otla Conch., 

 1862, p. 210.— "^ Hanley and Theobald, Conch. Ind., 1876, p. 22, pi. xlvi, 

 fig. 4. — * P.etel, Conch. Sam., Ill, 1890, p. 153. 



* Mar gar on {Unio) generosus Lea, Syn., 1870, j). 29". 



" f Unio lamellatus Sowerby, Conch. Icon., XVI, 1868, pi. xciv, fig. 511. 



Burma; Pegu, 



t LAMELLIDENS CANEFRIANUS Simpson. 

 ^ Unio in-oiensus TAPPEROXE-CANErRi,^ Am. Mns. Civ. Gen., VII, 1889, p. 349. 

 Prome, Lower Burma. 



fLAMELLIDENS JENKINSIANUS Benson.s 



"Unio jenkinsonianus Benson, Ann. and Mag., X, 1862, p. 185. — *Hanley" and 

 Theobald, Conch. Ind., 1876, p. 19, pi. xli, fig. 4. — "" P^tel, Couch. Sam., Ill, 

 1890, p. 155. 



Assam. 



Subgenus SPATHOPSIS, Simpson. 1900. 

 (Type, Anodonta guUlaini Eeclnz.) 



Shell long, elliptical, compressed, beaks rather low, said to bear con- 

 centrically roughened ridges, with slight i)lications in front and behind 

 them; posterior ridge not developed; surface shining, smooth; hinge 

 line narrow, with faint, greatly elongated pseudocardinals and laterals; 



' Credited by Sowerby to Benson. 



^Preoccupied by Lea in 1865 for a North Carolina Unio, hence the name is changed 

 as above. 



' This is figured by Hanley and Theobald as a heavy shell, shaped much like an old 

 Unio iuckleiji, find quite difierent from the other species of the geniis. But there 

 is in the U. S. National Museum collection a specimen which is much thinner than 

 the figured shell, and more nearly approaching marginalis in form. 



