144 PROCEEDINGS OF THE ACADEMY OP 



bus longis subcurvisque ; margaritca salmonis colore tincta et valde irides- 

 cente. 



Hab. — Swamp Creek, North Georgia, Maj. T. C. Downie. 



Unio Copei. — Testa la;vi, elliptica, subcompressa, inaequilaterali, aniice et 

 postice rotundata ; valvulis subcrassis antice crassioribus ; natibus prominu- 

 lis, ad apices uadulatis ; epidermide teaebroso-fuscata, ad margiiiem squamo- 

 sa, eradiata; deotibus cardinalibus subcrassis, elevatis, compressis, corrugatis, 

 in utroque valvulo duphcibus ; lateralibus longis, lamellatis, subcurvatisque ; 

 margarita purpurea et valde iridescente. 



Ilab. — Headwaters of Holston River, Smith Co., Va., Prof. E. D. Cope. 



Unio cylindrellus. — Testa hevi, late elliptica, cylindracea, valde inasqui- 

 laterali, antice et postice rotundata; valvulis subcrassis, antice crassioribus ; 

 uatibus prominulis ; epidermide luteola, eradiata ; dentibus cardinalibus 

 parvis, subconicis corrugatisque ; lateralibus longis subrectisque ; margarita 

 intus purpurea et valde iridescente. 



Hah. — Duck Creek, Tenn. : Swamp Creek, Murray Co., Ga., Major Downie ; 

 and North Alabama, Prof Tuomey. 



Unio difficilis. — Testa Isevi, elliptica, inflata, valde inffiquilaterali, postice 

 obtuse ansfulata, antice rotundata; valvulis tenuibis, antice crassioribus; 

 natibus prominulis ; epidermide luteola, valde radiata ; dentibus cardinali- 

 bus parviusculis, conicis crenulatisque ; lateralibus sublongis rectisque ; 

 margarita alba et valde iridescente. 



Ilab. — Swamp Creek, Ga., Major Downie; Holston River, Washington Co., 

 Prof. Cope. 



Unio Topekaensis. — Testa lajvi, lata, subcompressa, valde inaequilaterali, 

 postice obtuse angulata, antice rotundata; valvulis crassiusculis, antice cras- 

 sioribus ; natibus prominulis, ad apices undulatis ; epidermide tenebroso- 

 fusca, radiata ; dentibus cardinalibus erectis, compressis crenulatisque ; 

 lateralibus longis rectisque ; margarita cairuleo-alba et valde iridescente. 



^a6.— Topeka, Kansas, Prof. Daniels; Little Arkansas, Dr. Le Conte, &c. 



Unio Brazosensis. — Testa plicata, subrotunda, ventricosa, valde insequila- 

 terali, antice et postice rotundata; valvulis percrassis, antice crassioribus; 

 natibus prominentibus, tumidis, incurvis, ad apices minute undulatis; epi- 

 dermide tenebroso-rufo-fusca, eradiata; dentibus cardinalibus percrassis, 

 rfolidis, erectis corrugatisque ; lateralibus longis, subcrassis et obliquis; mar- 

 garita argentea et valde iridescente. 



Hab. — Dallas Co., Texas, Prof. Forshey ; Brazos River, Dr. Lincecum. 



Unio Lincecdmii. — Testa plicata, rotundata, subglobosa, valde ina?quilater- 

 ali ; valvulis precrassis, antice crassioribus ; natibus prominentibus, tumidis, 

 incurvis, ad apices minute undulatis; epidermide tenebroso-fusca, nigricaute, 

 eradiata ; dentibus cardinalibus percrassis, solidis, erectis corrugatisque ; 

 lateralibus longis, subcrassis et obliquis ; margarita argentea et valde irides- 

 cente. 



Hab — Dallas County, Texas, Prof. Forshey ; Brazos River, Texas, Dr. G. 

 Lincecum. 



Unio corvinus. — Testa lajvi, elliptica, inflata, valde inagquilaterali ; antice et 

 postice rotundata; valvulis subcrassis, antice crassioribus; natibus vix pro- 

 minentibus, epidermide nigra, subsquamea, eradiata; dentibus cardinalibus 

 parvissimis decussatisque ; lateralibus longis subrectisque; margarita alba 

 et valde iridescente. 



Hab.— ¥\mi River, Geo., J. C. Plant and Dr. Neisler ; Neuse River, N. C, 

 Prof. Emmons. 



Unio corvunculus. — Testa la^vi, elliptica, subinflata, valde inaequilaterali ; 

 antice et postice rotundata ; valvulis crassiusculis, antice crassioribus ; nati- 



[ April, 



