54 CATALOGUE FAMILY UXIOXID.E. 



* Uiiio tumescens, Lea. 



(Trans. Am. Phil. Soc., 2nd Series, Vol. X, PI. Ill, Fig. 7.) 



Described from Alexandria, Louisiana, whence it ranges to the Tennessee 

 river, in north Alabama, and to the Clinch river, east Tennessee. 



f Ijnio tnrgidnlus, Lea. 



(Jour. Acad. Nat. Sci. Phila.,2nd Scries, Vol. V, PI. V, Fig-. 211.) 

 Cumberland and Duck rivers, Tennessee. Groups with U. perplexus. Lea. 



\ Unio turgidus, Lea. 



(Trans. Am. Phil Soc., Vol. VI, PI. V, Fig. 11.) 



This form, which groups with IT. pustulosus, ranges from Louisiana, near 

 New Orleans, to Choctaw Nation, Indian Territory. 



f Unio tuscumbiensis, Lea. 



(Observations on the Genus dnio, Vol. XIII, PI. Ill, Fig-. 7.) 



Tennessee and Holston rivers, Alabama and Tennessee, and Poplar Creek, 

 Roane county, Tennessee. Groups with U. cdyariunus. Lea. 



* Uuio u n<l uliil us. Barnes. 



(Am. Jour. Sci. and Arts, 1st Series, Vol. VI. PI. IT, Fig. 2a, 2l>.) 

 This form has a wide range, throughout which it presents many local varieties. 

 It occurs, usually as a very common species, from Western New York to Ten- 

 nessee river, Alabama; to Michigan and Kansas; to San Saba river, Texas. It 

 is the type of a rather large group embracing U. latecostatus, U. atrocostotu.x. 

 U. pauciplicatus, U. neislerii, U. hippopwus, U. plicatus, U. perplicatax and 

 IT. elliottii. It is doubtful whether these forms should not be included in the 

 group of U. muttiplicatus. 



fUnio npsoni, Marsh, (Mss.) 



(Not figured.) 



This form was described by Mr. Marsh in a paper read before the Mercer 

 county, Illinois, Historical Society. The types came from the Mississippi river. 

 on the western border of Mercer county. A careful examination of the types 

 in the cabinet of the author of the species leads to the conclusion that it is not a 

 good species, but will fall under the synonomy of U. ligamentinus. It appears 

 to be a depauperate form of that species. The four specimens examined do not 

 present constant characters. 



CATALOGUE 46 



