DES MOINKS ACADEMY OF SCIENCE. 



* I'uio alatus. Say. 



; Am. .Jour. Sci. :ui<1 Arts. Nt Scries, Vol. XIV. Fi<r. 17a, 171). Originally figured in 

 Nicholson's Eneyc., Vol. IV, PI. IV, Fiir. 2.) 



Ifangfs from Ottawa river. Canada, to Central New York: to Michigan and 

 St. IVier's i Minnesota) river, in Minnesota; to Big Sioux river, Nebraska; 

 Kansatt to east Tennessee, an<l North Alal>ania. at Tuscumbia. Very slight dif- 

 ferences are presented by this species notwithstanding its wide distribution. It 

 i> the type of a group which includes U. hrvissismus, and U. yraciUs, all 

 three forms being bialate, and wide in their distribution, but all are very distinct. 



i A single valve is reported by Mr. T. II. Aldrich, to have been been found at 

 Troy, New York, but no living shells are known from that point.) 



i 1'iiio aiiHrmis, Lea. 



(Trans. Am. Phil. Sue., :M Series, Vol. VIII, PI. X, Fig-. 13,) 



No information concerning this species is accessible beyond that contained in 

 the original descry tion, which locates it in the Holston river, east Tennessee. 



I rnio andwsoiKMisis, Lea. 



(Ol.sei \ations on thetlcmis Unio. Vol. XIII, PI. XII, Fig-. 33.) 

 Holston and Clinch rivers, east Tei riesssee. This form is a member of the 

 group of which U. edfjarUinKx, Lea is the type. 



- 1'iiio anodontoides, Lea. 



iTnins. Am. Pttil. Soc., Vol IV, PI. VIII, Fig-. 11.) 



Distributed commonly from western New York to Flint and Chattahoochee 

 rivers, Georgia: to Trinity river, Texas: north to Kansas, Iowa and Michigan. 

 This is one of the most beautiful Unioiies in our waters. Its light straw colored, 

 beautifully rayed epidermis serves to distinguish it from all others of similar 

 form. I do not understand exactly how the specific name came to be applied. 

 It resembles an Anodon'a in no respect whatever. 



* Unio apicnlatiis, Say. 



(Descriptions of the S'.iells of North America, Plate LII.) 



Bayou Teche, Louisiana: the original specimens were obtained from a large 

 pile of the shells, of Giuithotlnn vuncatux (R<i)iyi<t cyrenoides) from Lake 

 Ponehnrtrain. Specimens of the closely related U. axjjcr, Lea, from Alabama, 

 have been received bearing the name ol this species. U. apecioKu* and ?' 

 fnrxhcyi also group here. I am not sure that these are all specifically distinct. 



CATAUMil K 11. 



