DES MOINES ACADEMY OF SCIENCE. ;>ij 



* Unio iiigcrrinius, Lea. 



.Trans. Am. Phil. Soc., 2nd Series, Vol. X, PL XVIII, Fig. 23.) 

 Described from the Red river, at Alexandria, Louisiana. See U. svbniNtm- 

 tiix, Say. 



f- Unio iiitens, Lea. 



(Trans. Am. Phil. Soc., 2nd Series Vol. VIII, PI. XII, Fig-. ]'.).) 

 "Long creek, Cocke county, Tennessee." This form appears to group with 

 U obscurus and U. pybasii. 



f I'nii* uotatiis, Lea. 



(Trans. Am. Phil. Soc., Vol. VI, PI. VIII, Fig. 22.) 



This species a member of the iris group was described from the Cumber- 

 land river, Tennessee, and has not yet been found elsewhere. 



f Unio iiovi-eboraci, Lea. 



(Trans. Am. Phil. Soc., Vol. VI PI. XXIV, Fig. 114. Also Natural History of NV\\- 

 York, Part I, Vol. V, Mollusca, PI. XX, Fig. 240.) 



Ranges from central New York to Michigan, Wisconsin, and Illinois. See 

 under U. iris, Lea. 



* Unio obliqmis, Lamarck. 



(Figured ?) 



This form is the type of a group of Uniones, which includes U. mytiloides 

 and the other species named in connection therewith. It is rather commonly dis- 

 tributed from the Alleghany river to Tuscuinbia, Alabama, Muscatine, Iowa, and 

 St. Peter's river, Minnesota. 



t Unio obsenrus, Lea. 



(Trans. Am. Phil Soc., Vol. VI, PI. Ill, Fig. 7.) 



Cumberland river, at Nashville, Tennessee. Groups with U. nilens, Lea, and 

 V. pybdsii, Lea. 



t Unio obiini'iis. Lea. 



(Ohscrvationa on the Onus Unio, Vol. XI11, PL II. Fig. 5.) 



The distribution of this form, which is a member of the edgartttnns group, is 

 quite local and confined to the drainage of the Tennessee at and below Knox- 

 ville to Muscle Shoals. 



CATALOGUE 31. 



