392 PROCEEDINGS OF THE ACADEMY OF 



Unio contigcds. Testa Iasvi, late elliptica, inflata, inaequilaterali, postice ob- 

 tuse angulata, antice rotundata; valvulis subcrassis, antice crassioribus ; nati- 

 bus subprorninentibus ; epidermide tenebroso-fusca, valde radiata; dentibus 

 cardinalibus subgrandibus, compressis, crenulatis ; lateralibus longis, laniellatis 

 subcurvisque ; margarita salmonis colors tincta et valde iridescente. 



Hab. Stewart's Mill Dam, Union County, North Carolina. F. A. Genth,M. D. 



Unio Riddellii. Testa, laevi, subtriangulari, valde inflata, ad umbones tu- 

 mida, postice obtuse angulata, antice rotunda, subaequilaterali ; valvulis crassis, 

 antice paulisper crassioribus; natibus valde prominentibus, incurvis, ad apices 

 plicis parvis indutis; epidermide fusco-oliva, obsolete radiata; dentibus cardi- 

 nalibus parviu'culis, subpyrainidatis corrugatisque; lateralibus crassis, corru- 

 gatis, curtis subcurvisque; margarita alba et iridescente. 



Hab. Dallas, Texas. Prof. C. G. Forshey. 



Unio ohunii. Testa laevi, triangulari, inflata, ad umbones subtumida, postice 

 obtuse angulata, antice rotunda, subequilaterali ; valvulis subcrassis, antice 

 crassioribus; natibus subprorninentibus, subincurvis, ad apices paulisper un- 

 dulatis ; epidermide rufo-fusca, obsolete radiata; dentibus cardinalibus sub- 

 grandibus, subcompressis corrugatisque ; lateralibus subcrassis, corrugatis, 

 subcurtis subrectisque ; margarita vel alba, vel rosea, vel salmonia et valde 

 iridescente. 



Hab. Dallas, Texas. Prof. C. G. Forshey. 



Unio Heermannii. Testa alata, laevi, elliptica, compressa, valde inaequilaterali, 

 postice obtuse biangulata, antice rotunda; valvulis subtenuibus, antice irre- 

 gulariter crassioribus; natibus prominulis, vix undulatis ; epidermide luteo- 

 fusca, micanti, eradiata; dentibus cardinalibus parvis, subconicis, crenulatis, 

 in utroque valvulo duplicibus; lateralibus longis, lamellatis subrectisque; mar- 

 garita pallido-salmon a, purpurescente et intense iridescente. 



Hab. Medina River, Texas. A. L. Heermann, M. D. 



Unio tesserul.e Testa, laevi, quadrata, cuboidea, valde tumida, valde inaequi- 

 laterali, postice obtuse angulata, antice truncata; valvulis crassis, ad apices 

 rugoso-undulatis ; epidermide mellea, mican'.i, radiis interuptis indutis ; den- 

 tibus cardinalibus parviusculis, 'subconicis corrugatisque.; lateralibus curtis, 

 obliquis rectisque ; margarita argentea et valde iridescente. 



Hab. Nolachucky River, Tenn. J. G. Anthony. 



Unio Northamptonensis. Testa laevi, oblonga, valde compressa, ad latere pla- 

 nulata, postice obtuse biangulari, antice oblique rotundata, valde inaequilaterali ; 

 valvulis subcrassis, antice crassioribus; natibus prominulis; epidermide vel 

 ochracea vel luteo-fusca. oblique radiata ; dentibus cardinalibus crassis, striatis, 

 in utroque valvulo duplicibus; lateralibus praelongis, validis, corrugatis, sub- 

 rectis lamellatisque; margarita vel alba, vel purpurasceute vel salmonis colore 

 tincta et valde iridescente. 



Hab. Connecticut River, at Northampton. At Springfield, by L. Shurtleff, 

 M. D. Below Hartford, T. R. Ingalls, M. D. Neuse River, N. C, E. Emmons, M. D. 



Unio Wardii. Testa, tuberculata,, subtriangulari, compressa, subaequilaterali, 

 postice et inferne emarginata, antice rotunda, ; valvulis crassiusculis, antice 

 crassioribus; natibus prominulis, ad apices rugosis; epidermide vel luteolavel 

 luteo-virente, maculis triangularis indutis ; dentibus cardinalibus subgrandi- 

 bus, compressis sulcatisque ; lateralibus sublongis, subcrassis, obliquis rec- 

 tisque; margarita, argentea, interdum rosea, et iridescente. 



Hab. Walhonding River, Ohio, J. C. Ward. Wassepinicon River, Iowa, Dr. 

 Foreman. Coal River, Virginia, Dr. Hartman. 



Unio Sampsonii. Testa laevi, oblonga, inflata, ad umbones valde tumida, 

 postice emarginata, antice rotunda, valde inaequilaterali; valvulis crassis, an- 



[Dec. 



