THE NAIADES OF MISSOURI II 7 



with alternate brownish bands. It is striking to note such a close 

 likeness of its shell to that of Uniomerus tetralasnia with which 

 it often accompanied in our muddy, sluggish creeks of North 

 Missouri. Of course it can be distinguished from the latter by 

 its very different umbonal sculpturing and by the absence of 

 teeth. Mr. Bryant Walker very kindly identified this species 

 and stated that the shells were more compressed than those from 

 Oklahoma and Kansas and that he had practically the same shells 

 in his collection from South-west Missouri under the names of 

 Anodonta texasensis Lea, but, being a doubtful species, it may 

 equal to Danielsii, or at any rate the latter has priority. Hence, 

 we are placing A. texasensis in the synonomy of this species. Simp- 

 son treats texasensis as very near Danielsii and, although he had 

 only a young, broken shell from Lea's collection for study, yet he 

 is very doubtful about the validity of it as a species and thinks 

 it may only be a mere variety of grandis after all. 



Anodonta Bealei Lea. 

 ("Beale's Shell.") 



Not figured. 



1863 — Anodonta bealei Lea, Pr. Ac. N. Sci. Phila., VII, p. 194; Jl. 

 Ac. N. Sci. Phila., VI, 1866, p. 26, PI. IX, fig. 25. 



The writer, not having seen this species, would infer from 

 Lea's figure that it is the same as A. Danielsii, or near. Through 

 the kindness of Dr. Dall, curator of the Divison of Mollusks for 

 the U. S. National Museum, report was made that Dr. John H. 

 Britts, (deceased), a well-known conchologist of this state, collected 

 shells of A. Bealei from the Grand River, Henry County, Missouri 

 and sent them to the National Museum where they are now 

 deposited under the numbers, 150,392 and 150,391. Simpson 

 states the geographic distribution of this species from Texas to 

 Kansas. 



Genus, Anodontoides Simpson. 

 1898a — Anodontopsis Simpson (in Baker), Tr. St. Louis Ac. Sci., 



VIII, p. 76. 

 1898b — Anodontoides Simpson (in Baker), Moll. Chicago, p. 72. 



ANIMAL CHARACTERS. 



"An'mal with marsupium occupying the outer and sometimes 

 the four leaves of the branchiae, ovules more numerous in the 



