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



tPARREYSIA CORBIS Hanley. 



* Unto cor&js Hanley, Biv. Shells, 1856, ii. 386, pi. xxiii, fig. 43.'— *Hanley and 



Theobald, Concli. Ind., 1876, p. 22, pi. xlv, fig. 10. 

 *Margaron ( Unio) corUs Lea, Syu., 1870, p. 50. 



Assam. 



-j-PARREYSIA BURMANUS Blanford. 



' Unio burmanus Blanford, Pr. Zool. Soc. Loud., 1869, p. 449. 

 *" Unio birmanus Hanley and Theobald, Conch. Ind., 1876, p. 19, pi. xlii, fig. 1.— 

 -Pjstel, Conch. Sam., Ill, 1890, p. 146 



Burma. 



tPARREYSIA 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. LxxAa, fig. 400.— -^ Hanley 

 and Theobald, Conch. Ind., 1876, p, 6, pi. xi, fig. 4, p. 44, pi. cvii, figs. 6, 7.— 

 *P.etel, Couch. Sam., Ill, 1890, p. 167. 



^Margaron ( Unio) sikkimensis Lea, Syn., 1870, p. 64. 



Sikkim, India. 



fPARREYSIA GOWHATTENENSIS Theobald. 



""Unio goichattenensis Theobald, Jl. As. Soc. Beng., XLII, 1873, p. 208, pi. xvn, fig. 

 4._*P^tel, Conch. Sam., Ill, 1890, p. 154. 



Gowliatti, in Assam. 



PARREYSIA SIMPULARIS Heude. 



* Unio modestus Heude, ^ Conch. Fluv. Xank., II, 1877, pi. xiv, fig. 29. 



* Unio aimpularis Heude, Jl. de Conch., XXXII, 1884, p. 20.— *P^tel, Conch. Sam., 



Ill, 1890, p. 167. 



China. 



PARREYSIA TRISULCATA Heude. 



* Unio trisidcatus Heude, Conch. Fluv. Nank., VIII, 1883, pi. lvii, fig. 108. 

 China. 



(Group of Parreysia leopoldvillensis.) 



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 mannscript. 



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

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

 species; hence Heude changed his first name to sim2nila7'is. It is quite probable 

 that this species should be placed in a separate group. 



