NO. 1205. SYNOPSIS OF THE NAIADES. SIMPSOX. 845 



tPARREYSIA CORBIS Hanley. 



"Uniocorbis HANLEY, Biv. Shells, 1856, p. 386, pi. xxm, fig. 43.' *HANLEY and 



THEOBALD, Conch. Ind., 1876, p. 22, pi. XLV, fig. 10. 

 *3Iargaron ( Unio) corbis LEA, Syn., 1870, p. 50. 



Assam. 



tPARREYSIA BURMANUS Blanford. 



" Unio bin-mamis BLANFORD, Pr. Zool. Soc. Loud., 1869, p. 449. 

 " Cnio bir mantis HANLEY and THEOBALD, Conch. Ind., 1876, p. 19, pi. XLII, fig. 1. 

 *P.ETEL, Conch. Sain., Ill, 1890, p. 146 



Burma. 



fPARREYSIA SIKKIMENSIS Lea. 



*Unio sikkimensis LEA, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 151; *J1. Ac. N. Sci. 

 Phila,, IV, 1859, p. 251, pi. xxxix, fig. 131; *Obs., VII, 1860, p. 69, pi. xxxix, 

 fig. 131.* SOWERBY, Conch. Icon., XVI, 1868, pi. LXXVI, fig. 400. * HANLEY 

 and THEOBALD, Conch. Ind., 1876, p. 6, pi. xi, fig. 4, p. 44, pi. cvn, figs. 6, 7. 

 *P.TEL, Conch. Sam., Ill, 1890, p. 167. 



*Margaron ( Unio) sikkimensis LEA, Syn., 1870, p. 64. 



Sikkim, India. 



tPARREYSIA GOWHATTENENSIS Theobald. 



* Uniogowhattenensis THEOBALD, Jl. As. Soc. Beng., XLII. 1873, p. 208, pi. xvn, fig. 



4. *P.ETEL, Conch. Sam., Ill, 1890, p. 154. 



Gowliatti, in Assam. 



PARREYSIA SIMPULARIS Heude. 



* Unio modesius HECDE, 2 Conch. Fluv. Nank., II, 1877, pi. xiv, fig. 29. 



* Unio simpularis HEUDE, Jl. de Conch., XXXII, 1884, p. 20. *P^ETEL, Couch. Sam., 



Ill, 1890, p. 167. 



China. 



PARREYSIA TRISULCATA Heude. 



* Unio trisulcatus HEUDE, Conch. Fluv. Xank., VIII, 1883, pi. LVII, fig. 108. 

 China. 



(Group of Parreysia leopoldmllensis.} 



Shell rounded rhomboid, somewhat inflated, subsolid, with a rounded 

 post ridge ; beaks full, the sculpture strongly and regularly zigzag-radial 

 and extending well over the body of the shell; pseudocardinals heavy, 

 subcompressed, crenate; anterior scars deep. 



1 Credited to Benson manuscript. 



2 The name modestus has been used by authors for a Brazilian Unio, but I can 

 not find that it was ever described. Later Kuster used the name for a Chilean 

 species; hence Heude changed his first name to simpularis. It is quite probable 

 that this species should be placed in a t-eparate group. 



