120 



beds; for it usually occurs abundantly in such situations when found at 

 all. The finest and largest examples of this remarkably beautiful Unio 

 come from the Cumberland River, Tennessee. 



Viiio ebemis. Lea. Neosho River at Burlington (Snow). 

 i.'nio elegans, Lea. Spring River. Baxter Springs, and Prairie Creek. 

 Jefferson Co. (Snow); Whitewater River (Mead). 



Unio frag-osus, Conrad. Neosho River at Burlington (Snow): White- 

 water River in' Butler Co. (Mead). 



This form is a member of a small group which is typified by Unio a.s- 

 perrhnus, Lea. It often attains a great size larger, far, than that reached 

 by any other member of the group. 



inio g-ibbosus, Barnes. Ottawa Creek at Garnett. Marais des Cygnes 

 River at Malvern, and Spring River at Baxter Springs (Snow). 



linio g-raciiis, Barnes. Verdigris River at Coffeyville (Snow); Little 

 Arkansas River near Wichita (Mead). 



This form is very abundant and attains a high degree of perfection in 

 the last-named locality. 



inio ia inviiiosus. Lea, Prairie Creek. Jefferson Co. (Snow); Cow- 

 skin Creek and Little and Big Arkansas Rivers, near Wichita (Mead). 



Unio Itevissimus, Lea. Silver Lake, Shawnee Co. (Quintard); Little 

 Arkansas River near Wichita (Mead). 



This, one of the alate Uniones, is distributed from New York to Texas. 

 It appears to be generally distributed throughout Kansas, but is of some- 

 what rare occurrence. 



Unio ligamentinns, Lamarck. Spring River at Baxter Springs (Snow) ; 

 Neosho River (Dr. Newlon). 



This form is ? (fften confounded with the following, from which, however, 

 it is very distinct. The character of the umbonal undulations, the heavier 

 cardinal and lateral teeth, tendency to pink color of nacre, and generally 

 more numerous green rays will serve to distinguish it from Lamarck's other 

 species. It is not so widely distributed as the next species. 



Unio luteolus, Lamarck. Marais des Cygnes river, creek at Moline, Ot- 

 tawa Creek at Garnett, Elk River at Howard (all Snow) ; Soldier Creek. 

 Shawnee Co. (Quintard). 



This is probably the most widely distributed Unio in North America. 

 It is also exceedingly variable. Various forms have been described under 

 the names of U. siliquoidcs, Barnes, U. liydianux, Lea, and U. r//.s7^/>,s. An- 

 thony. 



Unio metanevrus, Rafinesque. Spring River, Baxter Springs (Snow). 

 Unio occidens, Lea, Verdigris River at Coffeyville, Marais des Cygnes 

 River at Malvern, Spring River at Baxter Springs (Snow) ; Mill Creek, 

 Wabaunsee Co., and Soldier Creek, Shawnee Co. (Quintard) : Whitewater 

 River, near Towanda, Butler Co. (Mead). 



This form is properly a syuonym of Unio ventncotuSj Barnes, under 

 which name it is usually known to collectors. 



Unio parvus, Barnes. Canal at Hutchinson, and Turkey Creek, Barber 

 Co. (Cragin) ; Ellis (Dr. Watson). 



