116 THE NAUTILUS. 



an absolute synonym of lewisii, on the other hand, in view of 

 the well-known variation of the species of this genus in the 

 different rivers of the Alabama system, it is quite possible that 

 it may be varietally or even specifically distinct. Its final 

 position in the system must necessarily await its re-discovery in 

 sufficient quantity to enable its standing to be definitely deter- 

 mined. If its accidental page priority were to be recognized, it 

 would leave the specific type a matter of uncertainty for an 

 indefinite period. 



3. By adopting lewisii as the specific name, Dr. Lea's inten- 

 tion to perpetuate the memory of one of the leading concholo- 

 gists of hig time will be effective. 



In view of these considerations and assuming the two forms 

 to be synonymous, I select Unio lewisii Lea as the specific type. 



The synonym, therefore, would be as follows: 



PLEUROBEMA LEWISII (Lea). 



1861. Unio lewisii Lea, Pr. Ac. Nat. Sci. Phila., p. 40. 



1862. Unio lewisii Lea, Jl. Ac. Nat. Sci. Phila., v, p. 71, pi. 



vii, fig. 220; Obs., viii, p. 75, pi. viii, 

 fig. 220. 

 1861. ? Unio crapulus Lea, Pr. Ac. Nat. Sci. Phila., p. 39. 



1866. ? Unio crapulus Lea, Jl. Ac. Nat. Sci. vi, p. 42, pi. xv, 



fig. 40. 



1867. ? Unio crapulus Lea, Obs., xi, p. 46, pi. xv, fig. 40. 

 1900. Pleurobema cor Simpson, Syn., p. 754 (not of Conrad). 

 1914. Pleurobema cor Simpson, Desc. Cat., p. 765(not of Conrad). 



NOTE. The foregoing article was received before the publication of that on 

 U. cor in the January number. Most of the matter relating to cor has there- 

 fore been eliminated. EDS . 



ANODONTA DANIELSI LEA IN COLORADO. 



BY MAX M. ELLIS. 



While collecting fishes during October in Black Wolf Creek, 

 a tributary of the Arikaree River in eastern Colorado, a large, 

 isolated colony of bivalves was discovered, specimens from 



