114 THE NAUTILUS. 



tively strong, all projecting into the interior of the mussel, pointed ; 

 ligament rather long. 



Long. 2-8, alt. 2'4, diam. 17 mill. 



Hab. : Maine, Virginia, Michigan. 



At Caribou, Aroostook Co., Me., mainly in the Barren Brook, 

 Mr. Ol. O. Nylander collected, and sent me for examination in dif- 

 ferent lots, more than three thousand specimens. Mr. H. W. 

 Wiukley collected some near Saco, Me., and in Mr. J. B. Hender- 

 son's collection are a few lots from Old Orchard, Me. Mr. L. H. 

 Streng sent in different lots aboutl200 specimens collected nearGrand 

 Rapids, Michigan ; and the writer has found it rather common in 

 the Potomac River at Washington, D. C., as well as in different 

 runs and ditches in Virginia near the National Capital. 



Our species cannot be mistaken for any other Pisidium. In shape 

 it has some resemblance with P. abditum and politum ; but its small 

 size, the color and transparency of the shell, the shape of the cardi- 

 nal teeth, will readily distinguish it. In size, color and transpar- 

 ency of the shell, and the polished surface, it resembles P. ventrico- 

 sum and vesicalare ; but both the latter are much more inflated, 

 their beaks are quite posterior and larger. It is, however, rather 

 variable in size and coloration, and the striatiou of the surface. 



(To be concluded^). 



ELWOOD PLEAS. 



It is with sincere regret that we record the death of our old friend 

 and correspondent, Mr. Elwood Pleas, of Dunreith, Henry Co., 

 Indiana, which occurred on December 31, 1897. He was born May 

 4, 1831, and the greater portion of his life was spent in Henry 

 County. For a number of years he was Editor of "The Newcas- 

 tle Courier" and the old files of this and other papers bear ample 

 evidence of his earnest ability as an editor. His most interesting 

 articles were those pertaining to his favorite study, Natural His- 

 tory. Mr. Pleas was well known to many readers of THE NAUTI- 

 LUS, his principal contribution being " Shells of Henry Co., Indi- 

 ana," (Vol. VII, page 65). In this article he recorded 123 species 

 and varieties of land and fresh water shells found by him within a 

 radius of five miles from his home. 



