LIST OP CONTRIBUTORS. 89 



Lea, Isaac. Continued. 



Descriptions of twenty-six new species of Melanidse of the 



United States. P '68, 151 

 . Descriptions of seven new species of Unio from North Caro- 



lina. P '68, 160 



— Description of two new species of Unionidae from Equador. 

 P '68, 161 



— Descriptions of Unionidae from the Lower Cretaceous for- 



mation of New Jersey. P '68, 162 



— ■ Notes on microscopic crystals included in some minerals. 

 P '69, 4 

 — Further notes on microscopic crystals in some of the gems, 



etc. P '69, 119 



— Descriptions of six new species of fresh water shells. P 



'69, 124 

 — ■ Description of three new species of exotic Unionidae. P 



71, 188 



— Description of twenty new species of Uniones of the Uhited 

 States. P 71, 189 



— Descriptions of twenty-nine species of Unionidae from the 



United States. P 72, 155 



— Description of seven new species of Unionidae of the United 

 States. P 73, 422 



— On three new species of Uniones of the United States. P 



73, 424 



— Further notes on "inclusions" in gems, etc. P 76, 98 



— A new locality for allanite. P '82, 60 



— An account of the minerals at present known to exist in the 



vicinity of Philadelphia. J I, 462 



— On the genus Acostasa of D'Orbigny, a fresh water Lamelli- 

 branchia. J II, 125 

 - — ■ Description of a fossil saurian of the New Red Sandstone 



formation of Pennsylvania; with some account of that for- 

 mation. J II, 185 



On some new fossil mollusks in the Carboniferous slates of 



the anthracite seams of the Wilkesbarre coal formation. J II, 

 203 



• Descriptions of exotic genera and species of the family 



Unionidae. J III, 289 

 — Descriptions of the embryonic forms of thirty-eight species 



of Unionidae. J IV. 43 



