< OSMARII'M. 70 



these are arranged transversely also, in eight or nine scries on 

 each sendee]] ; the same c<i])t:iins two chlorophyllous nuclei. 



Diameter 29-33 //. 



I found this plant in collections made in Florida ; it differs 

 somewhat in size from Luudell's Swedish form, heing more 

 variable in length, varying from two to three diameters ; the 

 number of longitudinal series, if actual series, is greater than 

 specified ; the transverse series agree. 



C. notai'.ii.e, Breb. Plate XVI, fig. II. 



Length of cell nearly equal to two diameters, margins some- 

 what undulate-orenate, ends broadly truncate; semicells, base 

 somewhat reniform, sides converging from the base to the 

 broadly truncate end ; angles rounded ; cytioderm smooth or 

 finely granulate. 







Diameter 2530 ft. 



Met with rather rarely in shallow pool.- and on dripping 

 rocks. 



C. Bammebi, Reinsch. Plate XVIII, figs. 27, 36, 38. 



Small, smooth ; semicells in form of a truncate cone, 

 the end cither straight or Blightly retuse, the side- rounded 

 below and slightly concave above : the truncate ends about one- 

 half the diameter of the cell ; end view usually a regular 

 ellipse; lateral view of cell oblong with central constriction. 



Diameter 20-24 ,". 



Frequent in ponds. Reinsch describes several form-; 

 a larger and a smaller size, one with straight ends, another 

 emarginate; end view usually elliptic. Among our varieties 

 I find one with inflated centre; of eleven drawings made in 

 my sketch book nine are without central inflations, and two 

 with them, the latter even more inflated than the variety 

 retunforme, found in Norway, and described by Wille. 



('. X YMANXIAM'M, (inill. 



Cells somewhat hexagonal, finely punctate ; semicells 

 slightly broader than long; base rather flat, sides converging 

 from the base to the broadly truncate end, lower part promi- 

 nently rounded, sinuate near the end ; apex often retuse. 



Diameter 36-38 u.; length 50 ft. more or less. 



