DBS MOINES ACADEMY OF SCIENCE. 27 



fUnio fylindrelliis, Lea. 



(Tr.ins. AMI. I'hil. Soo., 2nd Series, Vol VI, PI. XL VIII, Fig. 121.) 

 Duck Creek, 'IVmirssrt', northwest Georgia, and north Alabama. This is a 

 member of the group of U. glans, with which it is synonymous. 



f Unio dae tylus, Lea 



(Trans. Am. Phil. Soc., 2d Series, Vol. VIII, PI. IX, Fig. 7.) 

 " Caney fork, Tennessee? " Can add no further information. 



* Unio declivis, Say. 



(Descriptions of the Shells of North America, PI. XXXV.) 



Shoal creek, Alabama, to Bayou Teclre, Louisiana. See under 17'. campto- 

 don. 



t Unio depygis, Conrad. 



(Figured ?) 



"Harpeth river, Tennessee." Further information upon this species is very 

 much desired. 



t Unio deviatus, Anthony. 



(Figured ?) 



"Tennessee." lean add no information concerning this species except that 

 it belongs to the group of perplexus. 



t Unio diffidlis, Lea. 



(Jour. Acad. Nat. Sci.Phil., 2nd Series, Vol. VI, H. XLlX, Fig. 124.) 

 Headwaters of the Holston river, in Virginia. ; and north Georgia. 



t Unio dispansus, Lea. 



(Observations on the Genus Unio, VoK XIII, PI. VI. Fig. 16.) 

 East Tennessee. Doubtfully attributed by Mr. Lea to the Holston rivet. 



t Unio dollahelloides, Lea. 



(Trans. Am. Phil. Soc., ^nd Series. Vol. VIII, PI. XV, Fig. 31.) 

 "Holston river, Tennessee." Ihis species is a member of the cuneolus 

 group. 



*Unio donariformis, Lea. 



(Trans. Am. Phil. Soc., Vol. Ill, Pi. IV, Fig. 3.) 

 Ranges from Ohio to Kansas, and north to Michigan and Wisconsin. This is 



CATALOGUE 19. 



