2o8 Quarterly Jouffial of Conchology. 



rad's description was published in N. Fr. W. Shells, 1834, p. 48* 

 PI. viii, fig. 4. Mr. Lea's description was published in Trans. Am_ 

 Phil. Soc, Vol. 58, PI. xix, fig. 71, date of title, 1837. Without 

 entering into discussion of the matter here, it may suffice to say- 

 that Mr. W. G. Binney in his elaborate review of the Vivifaridce, 

 in "Land and Fresh Water Shells of the U.S.," published by the 

 Smithsonian Institution, gives the species to Mr Conrad, while 

 Dr James Lewis, who is always very critically correct in such cases, 

 gives the species to Mr. Lea. I have not had the evidence neces- 

 sary to definitely settle the question of priority, which ought to be 

 honestly put right. 



By both writers the species in question was described as a Paht- 

 diiia; Mr. Conrad giving as habitat, "Alabama River at Claiborne,'' 

 and Mr. Lea simply "Alabama River." It is proper to add that 

 Mr. Conrad collected his own specimens, while Mr. Lea received 

 his from Judge Tait. In Trans. Am. Phil. Soc3\, ix, 22, (1844), 

 Mr. Lea described the Paludiimangulata, from the "Alabama 

 River (Judge Tait)." As his types of both species were from 

 Judge Tait, it is to be inferred that the type of P. angiilata was 

 from a locality not remote from that which furnished the P. bimoni- 

 Ufeia. In the same volume of the Transactions, ix, p. 23, (1844), 

 he described the P. Coosaensis, from tlie "Coosa Ri^-er, Alabama, 

 Dr. Brumby." It will thus be seen that all the types were from 

 different parts of the same stream ; that all were described as Palu- 

 difia, and that two of them were published in 1844. 



Previous to the description of the last two species, in July, 1840, 

 Prof. S. S. Haldeman commenced the publication of his "Mono- 

 graph of the Fresh Water Univalve MoUusca of the United States," 

 Avhich, as Mr. Binney observes, "must always remain a standard 

 work on the genera of which it treats." In a supplement to pt. i 

 of this Monograph, October, 1840, Prof Haldeman published five 

 sub-genera of the Palu.,iiiidce, as follows; Paludina, Lam.; Lutella, 



