xliii 



10. 



Of this genus, the type of the Trypanostomoid 

 form, there are five species, two of which are smooth 

 and three spinose ; they are of extremely localized 

 distribution, being confined to the head waters and 

 tributaries of the Tennessee Eiver, and principally 

 to the Holston, in Southern West Virginia and 

 East Tennessee. They are very numerous in indi- 

 viduals, as Mr. Anthony, during a visit made to this 

 region several years ago, selected and brought home 

 several thousand specimens. Prof. Haldeman also 

 was very successful in collecting them. 



PLEUEOCEKA. 



Of the eighty-four species, only thirteen are 

 found so far northward as the Ohio River, and only 

 five of them originate in that stream or its northern 

 tributaries. The Tennessee River and branches 

 claim thirty-three species, of which twenty-one 

 appear to be confined to its waters. The Cumber- 

 land River contains four species identical with those 

 of the Tennessee, and about a dozen that are not 

 found in the latter stream. The Alal^ama River 

 contains fourteen species, three of which seem to 

 be peculiar to it. These species are generally con- 

 fined, however, to those portions of the Coosa and 

 branches that approach to East Tennessee. A few 

 species also inhabit the Tombigbee, of Mississippi. 



About a dozen species have the simple habitat 

 "Tennessee" stated; nine have ''Alabama," and 

 two " South Carolina." I doubt very much whether 

 the latter is correct. 



There is very good reason to believe that all the 

 large tuberculate, sulcate and angulate species in- 

 habit the Tennessee River, tlie most ponderous ones 

 extending from the Coosa, through Michlle and 

 West Tennessee, to the Ohio River. Among the 

 angulate forms two, trlv'ittatiim and torhun, are 



