46 DE6MID8 OF THE UNITED STATES. 



straw-colored, smooth or finely striate; large chlorophyllous 

 granules in a single longitudinal series in the pent re of the 

 cell. 



Diameter 16 55 ft. 



There appear to he two varieties of this specie- ; one with 

 rather broad truncately rounded ends; the other, smaller 

 with more pointed end-. 



Georgia; Rhode [sland; (Bailey . Pennsylvania and 

 New Jersey ; occurs frequently. 



( '. Leibleinii, Kg. Plate VII, figs. 13 and 2<>. 



In outline bears a strong resemblance to the tw<> preceding, 

 but is shorter, stouter, upper margin more convex and ends 

 nmre acute; lower margin concave with ;i central inflation. 

 I >iameter 40-60 u. 



Pound in ponds with the two preceding. 



C. R.w.Fsn. Breb. Plate VII, 6g. L0. 



Stunt, finely and densely striated, curved, rapidly attenuated 

 into somewhat linear beaks wliieh are shorter than theventri- 

 cose body ; 68 times longer than broad. 

 Diameter 12 17 >>. 



Pond mar Perth A.mboy, Vu Jersey. 



< lolor of i his Bpeeies changes t'rum ^iven t< a yellow brown ; 



the upper margin is convex, the lower i rave but ventri- 



cose at the centre ; chlorophyl vesicles rather irregularly dis- 

 posed in a single i"\\ : a transverse suture is usually evident 

 in the middle. 



mi mis IV. Cells more or leas curved, ventral margin also somewhat inflated, 

 but the ends drawn out into i-:ik mi- seta-like extensions. Zygospores angular. 



C. R08TRATUM, Khrk Plate V I I I . fig8. I, 2, ">. 



Lanceolate-fusiform, end- thin, drawn < >ut to nearly half the 

 length of the body ; cytioderm light yellowish, densely but 

 finely striate; chlorophyllous vesicles ami vacuoles usually in- 

 distinct; the latter when Been ha- 12-15 actively moving 

 corpuscles. 



Diameter 23-40 ". 



Frequent in ponds, Pennsylvania, New Jersey, Vermont 

 Connecticut, Florida. 



In this vicinity, Bethlehem, Pa., copulating specimens are 

 of common occurrence. 



