145 



* ( iiio occideuti Lea. 



Decatur County, Ohio River, Wahash River, Falls of tiie Ohio, Bennett's 

 Creek, Vigo County. 



* Unio orbiculufus Hildreth. 



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

 name of Lhiio higyinaii. 



* Unto parrus Barnes. 



Wabash River, Ohio River, Creek at Greencastle (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 



big parrus of the Wabash." 



* Unio perplexus Lea. 



Wabash River, White River. 



Mr. Lea later twice described again this form, 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, Ohio Rivei', 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 diflferent shell, very much more 

 compressed. 



* Unio pressus Lea. 



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

 River, Lake Maxinkuckee. 

 "* Unio pH!<tuiatiii< Lea. 



Ohio River, Wabash River, White River. 

 ••• Unio pustulosus Lea. 



Wabash River, Ohio River. 



t See Trans. St. Louis Acad. Sci., Vol. VII, No. 1, pp. 36, 37; 1895. 



10 



