CATALOGUE FAMILY UNIONID^S. 



* Margaritana hildrethiana, Lea. 



(Trans. Am. Phil. Soc., Vol. V, PI. Ill, Fig. 8, as Unio liitdrethiana.) 

 Originally described from the Ohio river, near Cincinnati.' Specimens have 

 been taken in the Des Moines river, in Central Iowa, and at numerous interven- 

 ing points. It is one of those forms which, like Marg. calceola and Marg. 

 Iwlstonia, abound in creeks. The localities of greatest abundance yet reported 

 are near Iowa City, Iowa, and Indianapolis, Indiana. (Lehnert.) The species 

 varies little throughout its range. 



t Margaritana holstonia, Lea. 



(Trans. Am. Phil. Soc., Vol. VI, PL XIII, Fig-. 3T.> 



Though credited to the Holston river. East Tennessee, and bearing the name of 

 that stream, no authentic specimens are known from that location. His, how- 

 ever, a form exceedingly abundant in creeks and brooks in East Tennessee that 

 are tributary to the Holston. Marg. georgiana, Lea, similarly abundant in 

 the streams of North Georgia, and Marg. etowahcnsls, Lea, from the Etowah 

 river, also in northwest Georgia, are synonymous. The most southern limit 

 thus far known is Coosa river, and Shoal Creek, Shelby county, Alabama. 



IMargaritana margaritifera, Linnaeus. 



(Nat. Hist, of New York, Pt. I, Vol. V. Mollusca. PL XIV, Fig-. 224, as Alasmodonta 



arc tata, Barnes.) 



This species has a very eccentric distribution. A common form in the rivers 

 of Europe, it also occurs in both eastern and western North America. In the 

 northern states it abounds at some points in Vermont and Massachusetts, its 

 western limit over this area being near central Pennsylvania, but still within the 

 Atlantic drainage. In our area it occurs in the Gailatin river, and headwaters 

 of the Missouri but not east of these points ranging westward to British Col- 

 umbia and California. In portions of Nevada, Idaho and Utah, it is an exceed- 

 ingly abundant species, and in parts of California is used to some extent for 

 food purposes by the Indians. Anodonta nuttalliana, with a similar distribu- 

 tion, but limited eastward by the Wahsatch range, is the only other member of 

 the Unionidaz which is now known to subserve a similar use. 



* Margaritana marginata, Say. 



(Nat. Hist, of New York, Pt. I. Vol. V, Mollu sea. PL XIV. Fijf. 2,T>.) 

 Ranges from New Hampshire to Iowa and Kansas; to Georgia, in the Etowah 

 river, at Home; north into Canada in Itideau- and Ottawa rivers. This species 

 varies considerably at different points through its area of distribution, but is not 

 easily confused with any other. The figure cited above is a very poor one. 

 CATALOGUE 8. 



