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Sph. consohrinum, Ferussac. = Sph. ovale. 



Sph. constrictum, Anthony. = Sph. transversum. 



Cyclas Corsa, Charpentier. = Sph. Brochonianum. 



Cyelas crocea, Lewis. = Sph. secwia. 



Cyclas Cychkolzii, Bientina ; undescribed. 



Cyclaa Cyrcetiopsis, Valenciennes. = Corb. Cyrcenops 



Sph. detruncatum, Prime. = Sph. transversum. 



Sph. Deshayesiaimm, Bourguignat. = Sph. ovale. 



Cyclas diaphana, Prime. = Sph. modioliforme. 



Sph. distortum, Prime. = Sph. solidulum. 



Cyclas dubia, Say. = P. Virginicxim. 



Cyclas dubiosa, Say. = P. Virginicum. 



Cyclas duplicata, Pfeiflfer. = P. duplicatum. 



Cyclas Dupontia, Fdrussac. = Cyrenella Dupontia. 



Sph. eburneum, Anthony. = Sph. parhLmeiuyn. 



Cyclas edentula, Say. = Sph. striatinum. 



Cyclas elegans, C. B. Adams. = Sph. rhomboideum, 



Cyclas errans, Lewis. ; undescribed. 



Cyclas elliptica, Fdrussac. ; undescribed. 



Cyclas Euphratica, Lamarck = Corb. jiuminalis. 



Cyclas Jlavescens, McGillivray = Sph. corneum. 



Cyclas fliwiinea, Bosc. ; undescribed. 



Cyclas fluviatilis, Bosc. ; undescribed. 



Cyclas Fontaineii, D'Orbigny. = C. Fontaineii. 



Cyclas fontinalis, Draparnaud. = P. pusillurn. 



Cyclas fossarum, Krynicki. = Sph. corneum. 



Sph. fuscatum, Rafinesque. = Sph. striatinum. 



Cyclas gibba, Alder. = P. obtusale. 



Sph. giganteum, Prime. = Sph. simile. 



Cyclas globosa, Megerle. = Sph. corneum. 



Sph. gracile, Prime. = Sph. transversum. 



Cyclas ha77imalis, Rafinesque ; undescribed. 



E'uglesa Hensloiviana, Leach ; a Sphcerium. 



Cyclas hermaphrodita, Mart. = Gralathea radiata, 



Sph. Herminii, Wald. = P. casertanum. 



Sph. inornatum, Prime. == Sph. striatinum. 



Cyclas Islandica, Lamarck. = Cyprina Islandica, 



Cyclas isocardioides, Normand. = Sph. corneum. 



Cyclas laeustris, Draparnaud. = Sph. ovale. 



Cyclas Icevigata, Schumacker, is Corb 9 



Cyclas lasmampsis, Rafinesque. == Sph. simile. 



Cyclas Leachii, Ziegler. = Sph. corneum. 



Cyclas lenticularis, Normand. = P. casertanum. 



Cyclas liniosa, D'Orbigny. = Corb. limosa. 



Cyelas littoralis, Ferussac. = Sph. modioliforme. 



