I 06M \ i: I ( M . 73 



four parallel central series of smaller granules. It hears 

 -nine resemblance to C. polymazum, but differs in the central 

 granule- and in the double row of marginal Bmaller granules. 



C. TRAriivi'i.Ki i.iM, Lund. Plate XVI, figs. 26-29. 



Cells aboul one-fourth longer than the diameter ; isthmus 

 narrow; sinus narrow, enlarged outwardly; semicells Bubre- 

 niform; end- truncate, oude in centre; the margins of the 

 sides armed with five or sis conical spines; the area close to 

 the margin, is set with numerous conical spines arranged in 

 short concentric series ; the middle is ornate with -even gran- 

 ules, -i\ in a circle and one in tie- centre; between these 

 granules punctate; viewed from the vertex, elliptic with three 

 prominent grannies on each Bide; within the margin and near 

 it, i- a series of conical granules; lateral view circular. 

 ( Ihlorophyllous nuclei, t W". 

 1 iameter :;.;- Hi ft. 



Frequent in ponds, eastern Pennsylvania and Nan Jej 



C. tbiplicatum, Wolle. Plate XIX, figs 3 >>. 



Cell about one-fourth longer than broad, subrectangular ; 

 angles obtuse ; -inn- between the semicells linear; margins 

 irregularly granulate crenate : membrane rough with larger and 

 -mailer granules ; the larger ones arranged in series of three ; 

 three mi the margin of each of the superior rounded angles, 

 three within the margins, and three near margin between the 

 angles; on the margin of the -ide- near the inferior angles 

 two larger granules, and within the margins a tew scattered 

 smaller one-; end view quadrangular-oval with two series, 

 usually of -i\ larger granules, on each of the longer -ide-, 

 one of the series on the margin, and the other within. 

 Zygospores spherical, with long spines, fig. <>. 

 Diameter of cell, 40 // ; length about 50 y. 



Fond>, Pennsylvania and New Jersey. 



The nearest approach to this species is G. Ungerianum, 



Naeg. It is separated by its smaller size, the details of out- 

 line ami the arrangement of the larger granules. 



C. Ieelyanum, Wolle. Plate X VIII, figs. 33-35. 



( 'ells small, quadrangular, deeply constricted ; sinus narrow 

 linear; semicells twice a- wide a- long, with a small rounded 



