28 CATALOGUE FAMILY UNIOXIDvE. 



the type of a group which includes 77. zigzay (its synonym,) 7*. Heywi^ and 

 IT. lamarckianus. 



\ Uiiio dorfeuillianns, Lea. 



(Trans. Am. Phil. Soc.. Vol. VI, PI. XVII, Fig. 54.) 



From the Ohio river to Kansas river," at Topeka; south to Trinity river. 

 Texas. This species is a member of the piislulosux group of Unirmcs from the 

 type of which it is not far removed. 



f Unio druniiis, Lea. 



(Trans. Am. Pliil. Soc., Vol. V. PL X, Pig-. 29j 



Cumberland and Holston rivers, Tennessee. It is very close to 77. capcratus, 

 with which it groups. 



* Unio ebeims, Lea. 



(Trans, ^m. Phil Soc., Vol. IV, PI. IX, Fig. 14.) 



Ohio to Alabama river, atSelma; to Kansas; to Minnesota, Mississippi river. 

 77. globatus, 'U. snbglobaliis, II. leseucrianus, and 77. subrotundus, among 

 others, group with this form, and of them some may prove to be synonymous. 



t Unio edgarianus, Lea. 



(Trans. Am. Plril. Soc., 2nd Series Vol. VIII, PI. XV, Fig. 30.) 

 Clinch, Powell's and Holston rivers, Tennessee. This species may be consid- 

 ered the type of a rather large group which includes, with others, 77. obunc-us, 

 77. andersonensis, 77. flavidvs, and 77. tuscumbicnsis. The group apparently 

 offers some interesting synonomy. 



* Unio elegans, Lea. 



(Trans. Am. Phil. Soc., Vol. IV, PL IX, Fig. 13.) 



From western New York to Nebraska; to Neosho and Verdigris rivers, Kan- 

 sas. It is a fairly common species at all points where it occurrs. Some of the 

 Kansas specimens are the largest and finest seen Groups with II. dotmciformis. 



* Unio ellipsis, Lea. 



(Trans. Am. Phil. Soc., Vol. Ill, PL IV, Fig. 4.) 



Ottawa river, Canada; western New York; to Kansas; north to Minnesota. 

 The original specimens, forming the basis of description, came from the Ohio 

 river. 77. peulii groups here, and is a synonym. 



CATALOGUE 20. 



