DES MOINKS ACADEMY OF SCIENCE. 5} 



.' iincs have the sharp posteriorly pointed mules received a specific name, and to 

 an eipial number of specific diagnoses have the more swollen and posteriorly 

 emarginate females been subjected. J cannot see that the shell varies consider- 

 ably from the original description of Say who did not. as many appear to have 

 surmised, have before him the male of U. wr.sufKx, a tranp-Alleghany species- 

 t hough occurring occasionally in the northern portion of Ohio in rivers which 

 discharge into Lake Krie, The synonomy of this species will therefore stand 

 as follows: 



Unio subrostratus, Say, [1831. j 

 r/iio nashrUlensis, Lea, [1834.] 

 / 'nlo miss'mippiensis, Con., [1850.] 

 Unio nigerrimus, Lea, [1852.] 

 Unio rtitersviilensis, Lea. [1859.] 

 Unio topekaensis, Lea, [1868,] 



i Unio siibrotiiudns, Lea. 



(Trans. Am Phil. Soc., Vol. IV, PL XVIII, Fig. 45.) 



Ohio to Illinois. Specimens have been received under the name of V. poli- 

 tics. Say. See under U. ebenux, with which it groups, 



I Unio Niibtentus, Say. 



(Am. Jour, of Sei. and Arts, 1st S?rie<, Vol. XXV, PL I, Fig. 3.) 

 Green and Salt rivers, Kentucky, and Elk, Clinch and Holston rivers, Tennes- 

 see. 



I Unio Kiilcatns, Lea. 



(Trans. Am. Phil. Soc.. 2nd Series, Vol. Ill, PL Vltt, Fig. 12.) 



Ohio and Indiana south to Tennessee. Described originally from the Ohio 

 river. 



\ Unio syinmetricus, Lea. 



(Trans. Am. Phil. Soc., 2d Series, Vol. X, PL IV, Fi >-. 11.) 



This species, which was described from the Red river, Louisiana, belongs to 

 the group of which I', fttniptodoii, Say, is the type. No other localities Ivave 



been reported. 



f Unio tellieoensis, Lea. 



<< >lts<Tva1ions on the (Semis Unio, Vol. XIH. PI. X, Fi^. '-' s . - 

 " Tellico river, east Tennessee," 



CATALOCJI K 4o. 



