82 



and in some other characters. The animal differs still more both in 

 form and colour. 



Unio Brumleyanus. Testa, elliptic!., inflata, inaequilaterali, postice subbian* 



gulata; valvulis crassis; natibus ; epidermide nigra, polita; dentibus 



cardinalibus subgrandibus, lateralibus brcvibus subrectisque; margarita alba 

 et iridescente. Hab. Warrior River, Tuscaloosa, Alabama. — Prof. Brumley. 



Unio rcgularis. Testa regularitcr elliptic,')., subinflata, inaequilaterali ; valvu- 

 lis subtenuibus; natibus vix promincntibus; epidermide luteo-fusca, radiata; 

 dentibus cardinalibus minutis, lateralibus longis curvisque; margarita ccerulea 

 et iridescente. Hab. French Broad River, East Tennessee. — Dr. Troost and 

 S. M. Edgar. 



Unio mastus. Testa ovata, subinflata, valde innsquilaterali; valvulis sub- 

 crassis; natibus prominulis; epidermide tenebroso-fusca, rugoso-striata; denti- 

 bus cardinalibus parvis, lateralibus longis curvisque; margarita atro-purpurea 

 et iridescente. Hab. French Broad River, East Tennessee. — Dr. Troost and 

 S. M. Edgar. 



Unio sparsus. Testa sparsim tuberculata, triangulari, subinflata, subsequi- 

 laterali, postice emarginata; ad latus planulata; valvulis crassis; natibus ele- 

 vatis; epidermide luteola; dentibus cardinalibus grandibus ; lateralibus bre- 

 vissimis rectisque ; margarita alba et iridescente. Hab. Holston River, East 

 Tennessee. — Dr. Troost and S. M. Edgar. 



Unio argenteus. Testa obliqua, oviformi, valde compressa, valde inaequila- 

 terali, postice subangulata ; valvulis subcrassis; natibus subprominentibus; 

 epidermide luteo-fusca, polita ; dentibus cardinalibus subgrandibus, lateralibus 

 longis subcurvisque; margarita argentea et iridescente. Hab. Holston River, 

 East Tenn.— Dr. Troost and 5. M. Edgar. 



Helix Mobiliana. Testa subglobosa, rufo-cornea, nitida, perforata; spirit 

 brevi, obtusa; suturis impressis; anfractibus senis, convexis; apertura luna- 

 ta; labro reflexo. Hab. Vicinity of Mobile, Alab. — Charles Lea. 



Helix minutissima. Testa subglobosa, supra obtuso-conoidea, subtus con- 

 vexa, fusco-cornea, minutissime striata, umbilicata; spira brevi; suturis im- 

 pressis; anfractibus quaternis, rotundis; apertura. subrotunda; labro acuto. 

 Hab. Vicinity of Cincinnati. — T. G. Lea. 



Melania turgida. Testa lsevi, obtuso-conica, inflata, crassa, fasciata ; spira. 

 brevi, ad apicem acuminata ; suturis leviter impressis; anfractibus septenis, 

 planulatis; aperturS, parva, formam trapezii habente ; columella incrassata., 

 alba. Hab. Holston River, East Tenn. — Dr. Troost and S. M. Edgar. 



Melania glabra. Testa lsevi, conoidea, subtenui, nitida, tenebroso-castanea j 

 spira subelevata, suturis leviter impressis; anfractibus subplanulatis ; apertu- 

 ra elongata, formam trapezii habente, intus purpurata ; columella incurva. 

 Hab. Holston River, East Tenn. — Dr. Troost and S. M. Edgar. 



Melania perfusca. Testa la;vi, conoidea, subcrassa, tenebroso-fusca; spira 

 exerta; suturis linearibus; anfractibus subplanulatis; apertura grandi, inflata, 

 ovata, intus pallido-purpurea. Hab. Calf killer Creek, Tenn. — S. M. Edgar. 



Melania picta. Testa lasvi, obtuso-conica, crassa, sub-fusiformi, subviridi, 

 fasciata ; spira subelevata ; suturis impressis, superne exaratis ; anfractibus 

 octonis, planulatis ; apertura elongata, formam trapezii habente ; columellas 

 incurva. Hab. Holston River, East Tenn. — Dr. Troost and S. M. Edgar. 



