COSM V RTUM. 85 



Semioells trapezoid, narrowed from the broad, straight, base 

 to the truncate end ; sides, below, granulate dentate above 

 undulate ; end- lightly undulate ; angles, inferior and superior, 

 obtusely rounded ; cytioderm coarsely granulate, the verrucae 

 in subconcentric lines; end view shows a basal, granulated 

 protuberance. 



Diameter 60-70 .; length 66-75 u. 



I found this form first in the vicinity of Bethlehem, Pa., 

 in the year 1877, and then described it in the "Bulletin 

 Torrey ll"t. Club," of New York, Vol. VI, p. 186, as a new 

 Bpecies, < . irregulare, in reference t" the irregular size of the 

 crenae of the Bides. Lat< r research revealed Lundell's earlier 

 description. 



Since 1*77, have found the same plant in various localities 

 in Pennsylvania, Massachusetts ami New Jersey. 



C. Everettense, Wolle. Plate XVII, figs. 10, 11. L2. 



( 'ells as long as \\ ide ; constriction deep ; -inn- linear, often 

 much ampliated ; semicells with end- broadly rounded, or 

 truncate, sides convex ; membrane rough with large verrucae 

 arranged in concentric series; apes usually nude, surrounded 

 l>\- short, acute, conical teeth ; end, and transverse view -how 

 a decided central inflation. 



Length and breadth, 50-52 ". 



Ponds, Mt. Everett, Ma--. 



('. Eloiseanum, Wolle. Plate XIX, figs. 1. 2. 



('ells large, one third longer than broad : constriction form- 

 ing a deep, linear, outwardly widening -inn- on each side; 

 semicells semicircular, margins sel with long pointed teeth or 

 aculei : centre inflated and granularly rough, intermediate area 

 smooth or punctate; end view oval with a granular tumor 

 on each side, and two somewhat converging series of troth or 

 aculei extending from end to end. 



Diameter 75 u.; length 100 fi. 



Found in a pond in the vicinity of Minneapolis, Minn., by 

 Miss Eloisc Butler. The first specimens gathered late in the 

 season (1882) were of a dull yellow, or brown color. Speci- 

 mens of the following summer were dark green. 



