GEOGRAPHICAL DISTRIBUTION 



SPECIES OF THE FAMILY NAIADES 



To render the preceding Synoptical Arrangement more complete, it was deemed 

 advisable to make such a table as would throw together the species from each great 

 division of the world; and, to make this more useful, it has been thrown into alpha- 

 betic arrangement. 



GENUS MARGAUON. 



I. SUBGENUS TRIQUETRA. 



SOUTH AMERICA. 



Brownianus. Lea. Eiver Amazon, 

 corrugata. Lea. River Amazon, 

 subviridis. Klein. Eiver Amazon. 



ASIA. 



contorta. Lea. Pei-lio river, Cliina. 



II. SUBGENUS PRISODON. 



SOUTH AMERICA. 



truncatus. Solium. Eiver Amazon. 

 Dupreyi. (Unio.) Recluz. Eio Parana, 

 nodulosus (Mya), Wood. Hab. doubtful. 



III. SUBGENUS UNIO. 



EUROPE. 



Batavus. Lam. Various rivers, 

 crassus. Retz. Various rivers, 

 depressus. Lam. Nortli Holland. 

 24 



elongatus. Pfeif. Various rivers, 

 litoralis. Lam. Various rivers. 

 Petterianus? Kust. Montenegro, Greece, 

 pictorum. Lam. Various rivers, 

 platyrhynclius. Rossm. Caryntliia. 

 tumidus. Retz. Various rivers. 

 Valentinus. Rossm. Lake Albufera, Spain. 



ASIA. 



abnormis. More. Bankok. 

 asperulus. Lea. Siam. 

 Aucklandicus. Gray. New Zealand. 

 Aveia. Ben. Pulo Penang. 

 Bagdadensis. Bourg. TigTis. 

 Bengalensis. Lea. Elvers of Bengal. 

 Bensonii. Lea. East Indies? 

 bilineatus. Lea. Elvers of Bengal. 

 Bonneaudii. Eyd. 



Bourguignatianus. Lea. Eiver Tigris. 

 Brownii. Lea. Mocha. 

 Bruguierianus. Bourg. Smyrna, 

 cseruleus. Lea. Elvers of Bengal. 

 Cambodiensis. Lea. Takrong river, Siam. 

 Cbinensis. Lea. Hong Kong, China, 

 complanatus. Midd. Kamtschatka. 

 consobrinus. Lea. China. 



