80 THE NAUTILUS. 



soon as we were out of sight of the town we waded into the river. 

 In the clear water the Unios could be seen and picked up, and in a 

 couple of hours we had collected about 1,000 and returned to the 

 town, and shipped our catch home. By this time the August sun was 

 at a heat of about 92°, and we spent the rest of the day trying to 

 keep cool. By the next train we came home, and cleaned up and 

 assorted our booty. They were a rich lot. You lovers ofUnio, read 

 the list : 



Unio multiplicatus Lea. 



Unio trapezoides Lea. 



Unio perplicatus Con. with several "aliases." 



Unio purpuratus Lam., very numerous and large. 



Unio anodontoides Lea., rather scarce, and very poor. 



Unio cornutus Barnes. Fine. 



Unio sphaericus Lea. 



Unio refill gens Lea. 



Unio hydianus Lea. • 



Unio castaneus Lea. 



Unio gracilis Bar., very abundant. 



Unio nigerrimus Lea. A very distinct species, and most certainly 

 not sulirostiatus Say, as has been claimed. 



Unio cerinus Conrad, scarce. 



Unio askevvii Marsh, abundant. 



Unio chunii Lea, scarce. 



Unio riddellii Lea. This shell is so rare that Mr. Chas. T. Simp- 

 son writes me that these from the Sabine river are the only undoubted 

 specimens he has ever seen (excepting the type). 



Unio asper Lea. 



Unio elegans Lea. 



Unio satur Lea. Another "rara avis." (Some uniologists think 

 this shell to be a variant of U. occidens, but, from the study of 105 

 specimens, I believe it a "good" species.) 



Unio amphichaenus Frierson. This is a remarkable shell, and its 

 novelty has now "stood fire" without loss. 



Anodonta imbecillis Say. 



Anodonta edentula Say. (From a tributary of the Sabine river, 

 and by odds the largest specimen I have ever seen.) 



Anodonta virens-stewartiana, etc., etc. 



Margaritana confragosa Barnes. 



