List of the Mollusca of Missouri. 75 



from Indiana ; one that was more likely to have extended 

 to the west side of the Mississippi, than was one from 

 Tennessee, the locality of sordida. But if the two names 

 pleheius and cubicoides represent the same shell, the 

 former has precedence in time of ten years, and con- 

 sequently the latter is a synonym of the former. 



There are noticeable differences in the Goniobases 

 from different counties of Missouri, and if every minute 

 difference made another species the list of names would 

 perhaps not be small, but until this genus has been 

 worked over thoroughly it is better to err in having too 

 few names instead of too many. 



Years ago some of the above shells were submitted 

 to Mr, Tryon, and his decision was that they were 

 saffordi, and that cubicoides and plebeius were both 

 synonyms of saffordi. 



29. GoNioBAsis LivESCENS Mcukc. 



Branch of Fox Creek, Douglas Co. (13) ; Branch 

 of Gravois, Morgan Co. (10) ; Branch of Gra- 

 vois below Mineral, Morgan Co. (14) ; Speer's 

 Spring, Morgan Co. (25); Huff's Branch of 

 Gravois, Morgan Co. (15); Mill Race, Gravois 

 Mills, Morgan Co. (11) ; Clear Creek, Peirce 

 City, Lawrence Co. (22) ; Jacks Falls, Cur- 

 rent River, Carter Co. (Billups). 



30. GONIOBASIS OZARKENSIS Call. 



Blue Spring, Shannon Co. (4). 

 These specimens were received from R. Ellsworth 

 Call, and were a part of the original type lot. The spe- 

 cies was described in the same publication as Bytliinella 

 aldrichi. 



31. GoNioBASis DEPYGis Say. 



Jacks Falls, Current River, Carter Co. (Bil- 

 lups) ; Mississippi River, St. Louis (Billups) ; 

 Spring Valley Creek, Shannon Co. (Billups). 



