145 



'■■ ( nio occideiis Lea. 



Decatur County, ()hio Kiver, \VaI>asli River, Falls ot the Ohio, Bennett's 

 Creek, Vigo County. 

 *Unio orbiculatus Hildreth. 



Wabash River; Mr. Lea later descrilted the female of this species under the 

 name of I'nio higf^in.-<ii. 



* Unio parvus Barnes. 



Wabash River, Ohio River, Creek at (Treencastle (L'nderwood), Lake Maxin- 



kuckee. 

 Very large specimens of this usually small shell are obtained in the Wabash. 



So marked is their development that they are commonly known as " the 



hig parvus of the Wabash." 



* Uiiio perplex UrS Lea. 



Wabash River. White Kiver. 



Mr. Lea later twice described again this iotm, once as Unio rangianus and 



then as Unio sampsonii, both the latter from Indiana waters. It has other 



synonyms, by the same writer, in Tennessee waters. 

 *Unio phaseolus Barnes. 



Wabash River, (^hio River. St. Joseph River, Lake Maxinkuckee, Fourteen 



Mile Creek, near Charleston. 



* Unio plenus Lea. 



Wabash River. 

 ^' Unio plicatus Le Sueur. 



Ohio River, Wabash River. 



This shell, widely distributed, has a number of synonyms which I have else- 

 where indicated. T It is also often confounded with Unio undulatus 

 Barnes, which is. however, a markedly different shell, very much more 

 compressed. 



* Unio pressus Lea. 



Sand Creek, Decatur County ; Bruiett's Creek, Vigo County ; St. Joseph 

 River, Lake Maxinkuckee. 



* Unio pnstuiatiig Lea. 



Ohio River, Wabash Kiver, White Kiver. 



* Cni'o pustvJosus Lea. 



Wabash River, Ohio River. 



t See Trans. St. Louis Acad. Sci., Vol. VII, No. 1, pp. 36, .37; 18S15. 



10 



