SYNOPTICAL TABLE. 



Ill 



material before me, I sorted out all the specimens belonging to 

 what appeared to me as the same species into separate lots. 

 Then came the comparison of labels, the study of descriptions 

 and figures, the reference to dates of publication, &c. After my 

 work was done, I laid aside the subject for more than a year. On 

 resuming it lately, I have gone carefully over the whole ground 

 again, and have thus arrived at the following view of the syno- 

 nymy. Doubtless future research will modify my decisions. 



SYNOPTICAL TABLE. 



Family. RISSOID^. 

 Genus. Amnicola. 



a. elongated. 



Amnicola attenuata, Hald. 



A. elongata in pi. 

 Amnicola lapidaria, Say. 



Cyclostoma lapidaria, Say. 



Paludina lapidaria, Kiist. 

 Amnicola longinqua, Gould. 

 Amnicola nickliniana, Lea. 



Paludina nickliniana. Lea. 

 Amnicola protea, Gould. 

 Amnicola tenuipes, Couper. 

 Amnicola sayana, Anthony, 



Paludina sayana, Anthony. 



Cyclostoma cincinnatiensis, Lea. 

 Amnicola obtusa, Lea. 



Paludina obtusa, Lea. 



b. orbicular. 



Amnicola porata, Say. 



Paludina porata. Say. 

 Amnicola pallida, Hald. 



Amnicola lustrica, Adams. 

 Amnicola lustrica. Say. 



Paludina lustrica. Say. 

 Amnicola limosa, Say. 



Paludina limosa. Say. 



Amnicola porata, Gould. 

 Amnicola galbana, Hald. 

 Amnicola decisa, Hald. 



Amnicola cincinnatiensis, Anth. 



Paludina cincinnatiensis, Anth. 



Paludina emarginata, Kiister. 

 Amnicola granum. Say. 



Paludina grana, Say. 

 Amnicola parva. Lea. 

 Amnicola orbiculata, Lea. 

 Amnicola depressa, Tryon. 



Spukious Species. 

 Amnicola isogona. Lea. 



alhilabris, Wheatley. 

 dentata, Wheatley. 

 sayana, Wheatley. 

 gibbosa, Wheatley. 

 integra, Hald. 

 seminalis. Cooper. 

 nuttalliana. Cooper. 



Family. TIVIPARIDiE. 



Genus. Vivipara. 

 a. nodulous. 

 Vivipara magnifica, Conr. (^Pal.) 

 Paludina bimonilifera, Lea. 

 angulata. Lea. 

 b. carinated. 

 Vivipara multicarinata, Hald. 

 Paludina multicarinata, Hald. 



carinata, Val. [Lea^ 

 Vivipara cyclostomatiformis, 

 Paludina cyclostomatiformis, Lea. 

 contorta, Shuttl. 

 elliotti. Lea. 



