COSMARIUM. 83 



which give a crenate appearance to the margin ; chlorophyl 

 masses two, often very conspicuous. 

 Diameter 60-78 ^. 



Rather common. The semi-cells are usually near in form 

 to two-thirds of a circle. The transverse view is broadly 

 elliptic. The four chlorophyl nuclei, which are frequently 

 very prominent, two in each semi-cell, probably suggested the 

 name, four-eyed. 



C. PARDALIS, Cohn. Plate XLIX, figs. 3-5. 



Cells suborbicular or subquadrate, equal or slightly longer 

 than broad, constriction narrow linear or often somewhat 

 dilated inwardly, and more or less ampliated outwardly ; 

 semi-cells transversely oblong, subreniform ; base and vertex 

 truncate or concave, angles inferior and superior rounded ; 

 lateral view suborbicular; vertical view oblong, sides 

 straight; membrane verrucose, verrucae (papillae) obtuse, 

 regularly arranged in diagonal rows. 



Diameter 54-57 /<. ; length 75-80 >u. ; thickness 39 /n. ; 

 isthmus 18-20 jn. 



Lagerheim reports this African plant from Tewksbury, 

 Mass. It has not come under my notice. Looks like a close 

 relation to some form of C. conspersurn. The figures repre- 

 sent a front, a lateral and a transverse view, copied from 

 Conn's figures. 



C. INTERMEDIUM, Delp. Plate XVI, fig. 12. 



Cells very near the preceding (C. tetrophthalmum], some- 

 what smaller, semi-cells more absolutely semiorbicular, not 

 so elevated. 



Diameter 45-50 yw. 



Habitat same as the preceding. 



C. DENTATUM, Wolle. Plate XVI, fig. 15. 



Cells about one-half longer than wide; constriction deep, 

 forms gaping sinuses ; cytioderm rather closely set with small 

 pearly granules ; the margins of the rounded sides of the 

 semi-cells dentate with large and distant conical projections, 

 or teeth; ten to twelve on each side. The ends broadly 

 rounded are devoid of projecting teeth. End view of cell 

 oval ; lateral view elliptic with a constriction in the middle. 



Diameter 90-100 /u. ; length 145-160 /u. 



This plant has hitherto been found only in Pennsylvania, 

 New Jersey, Florida and Massachusetts. 



It is separated from C. oralc, its nearest kin, by the shape 

 of the semi-cells, which are not triangular, or conical, but 

 broadly oval, and l>y the nudity of the apices. 



