132 THE NAUTILUS. 



'' The Prairie " and entered the main stream of the Wabash not far 

 below Huntington. There is excellent reason for believing that the 

 Unione fauna of the Maumee has received additions, by means of 

 this canal, since the days when the upper part of what is now the 

 Maumee water course served as a southward flowing outlet for the 

 glacial lake Maumee. Such additions are Quadrula cylindrica strig, 

 illata (B. H. Wright), Pluerobema clava (Lam.), Plagiola securis 

 (Lea) and Symphynota complanata (Barnes). Q. cylindrica strigil- 

 lata has proceeded down the river as far as Antwerp, Ohio, and clava 

 as far as Defiance. Knowledge of securis is confined to one specimen 

 found in a clammer's camp just below Fort Wayne. The lower- 

 most station for complanata is New Haven, about seven miles below 

 Fort Wayne. While this species is known to two other streams 

 within the Great Lakes drainage, it is unquestionably a new comer 

 in the Maumee. Call records Obovaria retusa (Lam.) from the St. 

 Joseph, which receives the name of Maumee at Fort Wayne. It is 

 highly probable that he had before him specimens or Quadrula pus- 

 tulosa, much produced forward, free of tubercles and suggestive of 

 retusa. This form is to be seen not infrequently in many parts of 

 the Maumee. 



The Naiades of the Maumee and the upper parts of the Wabash 

 now very nearly approximate one another, counting the recent ad- 

 ditions for which the Wabash and Erie canal may be thanked. In 

 a rather hurried collecting excursion along the main stream of the 

 Wabash from St. Henry, Ohio, to Bluffton, Ind., last fall, Unio 

 crassidens Lam. and Quadrula heros (Say) (possibly) were the only 

 species lound which are unknown to the Great Lakes drainage. In 

 case either of these species appears some day in the Maumee, its 

 presence might reasonably be accounted for by glochidia-bearing fish 

 which crossed the divide in the course of the flood of 1913. 



It is convenient here to chronicle the finding of Unia tetralasmus 

 sayii Ward, a stranger from the southern drainage, in Cedar Creek, 

 Lucas County, and Toussaint Creek, Ottawa County, Ohio. These 

 small streams empty into Lake Erie and are only a few miles apart. 

 Further exploration is necessary before it is wise to speculate as 

 to the reason for the appearance of the species so far from home 

 waters. 



