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Sph. consobrinum, Ferussac. = Sph. ovale. 



Sph. constrictum, Anthony. = Sph. transversum. 



Cyclas Corsa, Charpentier. = Sph. Brochonianum. 



Cyclas crocea, Lewis. = Sph. securis. 



Cyclas Cychkolzii, Bientina ; undescribed. 



Cyclas Cyrcenopsis, Valenciennes. = Corb. Cyrcenopsis. 



Sph. detruncatum, Prime. = Sph. transversum. 



Sph. Deshayesianum, Bourguignat. = Sph. ovale. 



Cyclas diaphana, Prime. = Sph. modioliforme. 



Sph. distortum, Prime. = Sph. solidulum. 



Cyclas dubia, Say. = P. Virginicum. 



Cyclas dubiosa. Say. = P. Virginicum. 



Cyclas duplicata, Pfeiffer. = P. duplicatum. 



Cyclas Dupontia, Fe'russac. = Cyrenella Dupontia. 



Sph. eburneum, Anthony. = Sph. partumeium. 



Cyclas edentula, Say. = Sph. striatinum. 



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



Cyclas errans, Lewis. ; undescribed. 



Cyclas elliptica, Fe'russac. ; undescribed. 



Cyclas Euphratica, Lamarck = Corb. fluminalis. 



Cyclas flavescens, McGrillivray = Sph. corneum. 



Cyclas fluminea, Bosc. ; undescribed. 



Cyclas fluviatilis, Bosc. ; undescribed. 



Cyclas Fontaineiij D'Orbigny. = C. Fontaineii. 



Cyclas fontinalis, Draparnaud. = P. pusillum. 



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 hammalis, Rafinesque ; undescribed. 



Euglesa Henslowiana, Leach ; a /Sphcerium. 



Cyclas hermaphrodita. Mart. = G-alathea radiata. 



Sph. Herminii, Wald. = P. casertanum. 



th. inornatum, Prime. = Sph. striatinum. 

 clas Islandica, Lamarck. = Cyprina Islandica. 

 Cyclas isocardioides, Normand. = Sph. corneum. 

 Cyclas lacustriSj Draparnaud. = Sph. ovale. 

 Cyclas Icevigata, Schumacker, is Corb ? 

 Cyclas lasmampsis, Rafinesque. = Sph. simile. 

 Cyclas Leachii, Ziegler. = Sph. corneum. 

 Cyclas lenticularis, Normand. = P. casertanum. 

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

 Cyclas littoralisj Fe'russac. = Sph. modioliforme. 



