THE NAUTILUS. 107 



cared for, and then returned the rest to the water for future use. 

 From one of the U. occidens I took one of the finest pearls that I 

 had ever seen. It was a perfect oval, very lustrous, and about the 

 size of a small buckshot. The exceptional shell found in the bayou 

 was Margaritana confragosa Say, not heretofore reported in this 

 stream, though they are not uncommon at Liverpool on the Illinois 

 River. Two or three young shells were found, which is a good indi- 

 cation that the parents were somewhere about. In a pool in the 

 shade of a long bridge at Bernadotte, I found a large number of 

 Pleurocera elevatum Say and a few Somatogyrus subglobosiis Say. 



* * # * A collector in Texas has also sent me some fine 

 specimens, a list of which may prove of interest to the members of 

 the Isaac Lea Chapter of the Agassiz Association : Unio nodifents, 

 U. ma it ii In' lux, U. rotundatus, very large and fine; U. purpuratus, 

 U. aureus, also a variation of the same ; U. Mitchelti, said to be 

 found only in Guadaloupe River ; U. tampicooensis, U. hydimms, U. 

 berlandierii, U. perplicatus, U. speciosus, U. tubereulatus, Ano- 

 donta leonennis, A. stewartiana. The U. manubrius is the long-lived 

 mussel, burying itself and living for months in the banks and beds 

 of streams after they have dried up. The U. tubereulatus is the 

 purple nacre variety. These are all from Jackson and Victoria 

 Counties, and from Guadaloupe and Brazos Rivers, Skull, Colleto, 

 Spring and Garcitas Creeks, and Ripley, Bluett's and Manchoula 

 Lakes. 



Of the smaller species [ also received the following: Spluerium 

 elevatum, Polygyra texasiana, Praticolella berlandii rinnit, P. gris- 

 cola, Polygyra auriformis, Physa mexicana, Vitrea electrina, Biiliiini- 

 lus schiedianus. 



While at Niagara Falls in August 1 found Goat Island rich in 

 Helices. The Polygyra albolabris, large form, was particularly 

 noticeable. Early in the morning great fine ones were to be seen 

 crawling about over the leaves and in the crevices of the rocks in 

 the almost impenetrable shade of the thick forest that covered the 

 island. * * * 



I append the list or the Uniouidte of the State (Illinois). Later 

 I will issue a printed list with localities. I am indebted for much 

 valuable information and assistance to Messers. Hinkley, Ferris, 

 Marsh and Wolf, of Illinois; to Dr. Leach, of Michigan, and the 

 late Dr. Stein, of Indiana. Some of the species in the list are 

 doubtless synonyms, as Unio zigzag and U. donaciformis, U. occidens 



