NATURAL SCIENCES OF PHILADELPHIA. 93 



undulatis ; epidermide olivacea, undique radiatd ; dentibus cardinalibus par- 

 vis, conicis, crenulatis, in utroque valvulo duplicibus; lateralibus longis lamel- 

 latis subcurvisque ; margarita vel caeruleo-alba vel purpurascente et valde 

 iridescente. 

 Hab. Tuscumbia, Alabama, L. B. Thornton, Esq. 



Unio scitulus. Testa Lsevi, elliptica, inflata, valde insequilaterali, postice 

 obtuse biangulata, antice rotundata; valvulis subtenuibus, antice crassiorib us ; 

 natibus prorninentibus, ad apices undulatis; epidermide lutea, undique virido- 

 radiata; dentibus cardinalibus parviusculis, erectis, acuminatis, crenulatis, in 

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

 garita alba et valde iridescente. 



Hab. Tuscumbia, Alabama, L. B. Thornton, Esq. 



Descriptions of Four New Species of MELANID2E of the United States. 



BY ISAAC LEA. 



ScHizocHiLtrs Showalteeii. Testa, transverse costata, subcylindraeea, 

 crassa, castanea, minute striata ; spira, elevata ; suturis impressis ; anfractibus 

 subplanulatis ; fissura submagna, profunda ; apertura subparva, elliptica,, intus 

 vittata,; columella subcrassa ; labro paulisper crenulato. 



Hab. Coosa river, Uniontown, Alabama. E. E. Showalter, M. D. 



Anculosa Showalterii. Testa valde costata, suborbiculari, crassa, tenebroso- 

 fusca, nigricante. exilissime striata ; spira brevissima ; suturis valde impressis; 

 anfractibus inflatis, septenis transversis costis indutis ; apertura magna, sub- 

 rotunda, superne subangulata, interne tenebroso-vittata ; columella crassa, 

 planulata, tenebroso-fusca: labro valde extenso et valde crenulato. 



Hab. Coosa, river, Uniontown, Alabama. E. R. Showalter, M. D. 



Melania crenatella. Testa, transverse striata, turrito-subulata, subcostata, 

 paulisper plicata, subtenui, tenebroso-fusca, nigricante ; spha. elevata, ad apices 

 crebre plicata ; suturis valde impressis ; anfractibus septenis, planulatis, trans- 

 versis costis indutis; apertura parva, elliptica, intus vittata; columella 

 albida, incurvata ; labro subcontract et valde crenulato. 



Hab. Coosa river, Uniontown, Alabama. E. R. Showalter, M. D. 



Melania Newberryi. Testa laevi, ovato-conica, subtenui, tenebroso-fusca, 

 trivittata, inferne suturis lutea; spira subelevata ; suturis valde impressis; 

 anfractibus senis, inflatis; apertura parviuscula, ovato-rotundata, intus albida. 

 et vittata ; columella albida, incurvata ; labro inflato. 



Hab. Upper des Chutes river, Oregon Territory. J. S. Newberry, M. D. 



Descriptions of New Species of Cretaceous Fossils frcm New Jersey. 



BY WM. M. GABB. 

 Act^onina D'Orb. 



A. b i p 1 i c a t a , pi. 2, fig. 13. 



Actceon biplicata, M. & H. 



This fossil I had considered new, but have, since the plate was drawn, seen 

 the type of Meek and Hayden's species, to, which it bears such a close resem- 

 blance, that I shall refer it to their species. The fact of its having been re- 

 ferred to another genus, and the figure not having been published, misled me. 

 The existence of two folds on the columella, which can be seen in the New 

 Jersey fossil, has not been yet ascertained in the one from Nebraska. 

 I860.] 



