VIVIPARA. 43 



and numerous narrow spiral bands ; apex pointed ; suture deep ; 

 lines of accretion very fine ; aperture regularly rounded, produced 

 posteriorly. Color bright green, often passing into brownish ; the 

 spiral bands are fuscous, and the inside white." 



Paludinn niinuta, Say, of KijsTER, Chemn. ed. ii, p. 52, pi. x, f. 15-16, is 

 Cingula mintita, Totten. Mr. Say never described any such species. 



Paludina hi/alina, Lea (not of MoRELET),is a distorted Planorhis exacutus, 

 q. V. 



Paludina turrita, Menke, Syn. Meth. p. 40, is mentioned by name only, 

 CycJosioma marginatum, Say, being mentioned doubtfully as a syno- 

 nym. 



Paludina aculeus, Kijster, Chemn. ed. ii, p. 73, pi. xiii, f. 8-9, is Cinrjula 

 aculeus. 



Paludina scalaris, JxY=Physa scalaris, q. v. 



Paludina poratn, Say, is mentioned by name only in Menke's Syn. Meth. 

 p. 42 (1830) with P. katschkana, Pakk. and P. Jiuminensis, Ziegler, 

 as its synonyms. 



Paludina castanea, Valenciennes, Humboldt and Bonpland, Rec. d'Obs. 

 II, 256, is not specified as American. The description was drawn 

 from a specimen in the Paris Museum, locality unknown. 



Paludina decipiens is mentioned by name only among the American spe- 

 cies added to those cited in Lamark's Animaux sans Vertebres, by 

 Gould's translation (p. 70, Genera of Shells). I have no informa- 

 tion concerning it. 



Finding Pleurocera of Rafinesque quoted in the synonymy of Vivipara 

 by Adams, Gen. Rec. Moll., I was inclined to place the following species 

 in Vivipara, but now omit them. 



Pleurocera acuta, Enum. and Ace, p. 8. 



Pleurocera rugosa, " " " p. 8. 



Pleurocera gonula, " " " p. 7. 



Pleurocera verrucosa, Ann. of Nat., No. I, p. 11 (1820). 



The genus Pleurocera is considered by Haldeman (Mon. of Leptoxis and 

 Encycl. Icon., Baird's ed.) to be the same as lo, Lea, which last name not 

 having priority of publication would be considered a synonym of Pleuro- 

 cera. Tlie following description of Rafinesque is translated from the Journal 

 de Physique, &c. of Brussels, LXXXVIIl, p. 423. The fac-simile fig. 76 is 

 from a MS. work of the same author, " Conchologia Ohioensis," kindly lent 

 me by Prof. Haldeman. 



Pleurocera, 1. c. — Shell spiral, oval or pyramidal, numerous t^- «/. 

 rounded whirls ; aperture oblong, oblique, base pro- 

 longed, twisted, narrowed above ; outer lip thin, inte- 

 rior lip appressed to the columella, which is smooth 

 and twisted, without umbilicus. Animal with a mem- 

 branaceous operculum, proboscis-like head, inserted 

 on the back ; tentacles two, lateral, subulate, sharp, 

 eyes at their exterior base. Family of Turbinacea. Pleurocera. 



