4(j CATALOGUE FAMILY UNIONIM?. 



ties have been severally called' U. sph^ricus, IT.hvustonensls, U. wimolcniftii.. 

 U. prasinus and U.vullatus, all of which group in a natural assemblage with. 

 the early described U. pustulosits as the type. 



f Unio pybasii, Lea. 



(Jour. Aead. Nat. Soi. Phila., Vol. V. PI. VI. Fiy. 21ii.) 

 East Tennessee and North Alabama. Groups with /'. obscunis, and {'. tcncr. 



* Unio pyramitlatiis, Lea. 



(Trans. Am. Phil. Soc., Vol. IV, PI. XVI. Fig. 39.) 



Ohio to the Alabama river, at Selma; to Kansas: to Rock river, Wisconsin. 

 See under U. obliquus, Lamarck. 



f Unio radiosus, Lea. 



(Observations on the Genus Unio, yo!. XIII, PI. Ill, Fig-. 5>.> 

 Holston river, Tennessee, and Tennessee river, north Alabama. 



f Unio rangianus, Lea. 



(Trans. Am. PhiL Soc., Vol. VI, PI. XVIII, Fig. 56.> 



Ohio, Indiana, Illinois, and Michigan. Belongs to the group of piT/>/<.n/.v. 

 which see. 



fUnio ravcnelianns, Lea. 



(Trans. Am. Phil. Soc., Vol. V, PI. Ill, Fig. 5.) 



Asheville, North Carolina, and Black Warrior river, Jefferson county, Ala- 

 bama. 



* Unio rectns, Lamarck. 



(Am. Jour, of Sci. and Arts, 1st Series. Vol. VI PL XIII, Fig. 11, as Unio 

 prcelongus, Barnes.) 



This is one of the most widely distributed species in the United States. It 

 ranges from the Rideau and Ottawa rivers, Canada, to western New York; Ala- 

 bama river, at Selma; to Texas; to Kansas and north to the Red river, at Pem- 

 bina, Its characters remain quite constant over all this vast area. It appears to 

 group with Unio anodontoid< s, though totally different in color and ornamen- 

 tation. It is often confounded with U. gibbosiis, but the latter has less fre- 

 quent and much coarser undulations on the umbones, and much heavier lateral 

 teeth. The species, as it usually occurs, has an in idescent, deep purple nacre, 

 but individuals entirely or partially white, in respect to thv j nacre, occur abund- 

 antly 



CATALOGUE 38. 



