130 1' i: !•; S II - W A T K Fv A L G Ai O F T II E U N 1 T K D ST A T E S. 



found on tlie continent, v,'crc. collected by myself iu " Shepherd's Mill Tond," near 

 Bridgeton, Cumberland County, New Jersey. 



Fio-. 7 a, pi. 21, represents the outUne of a frond magnified 460 diameters. 



C. ainoeniiin, Bugb. 



C. mi'ilinci-f, (ibli)iigum cyliiidricnm, IcvitcT comprcssnni, diamctro duplo fere triplove longins, 

 utruquc polo rotuiidatiiii), iiitMliu jirofunde constrictmn, sinu angusto, lincari, amiiitu graiiulis 

 luargaritacL'is achrois ob.sessuni, a vertice fllipticum ; scmicellulis obloiigo-rotundatis, dorso 

 alto convexis, lateribus vero rcctis parallelis, angidis inferioribus rectiS et Rul)afulis; cytio- 

 dermate granuloso-verrucoso, vurrucis Iiyaliuis in scrius rcgularcs dispositis. (K.) Sjjecies 

 viihi ifjnota. 



Long. 0.0017"— O.IOIG"; lat. 0.00087". (R.) 



Syn — C. auumum, Brebisson. Rabenhorst, Flora Europ. Algar., Sect. III. p. 159. 



//a6.— Florida; Bailey. Rhode Lslaiul (S. T. Olncy); Tlnvaitcs. 



Frond twice as long as broad, sides parallel, ends rounded, constriction deep, linear; segments 

 rough with crowded obtuse j)apilla-like pearly granules; s. v. much compressed, about thrice 

 as long as broad ; e. v. elliptic. (A.) 



** Cyliodermate glahro. 



** Cytioderm smooth. 



C. t'HCUlllis, C'URD.V. 



C. ovale ellipticuni, utroqnc polo late rotundatum, tertiam partem vel duplo longius quam latum, 

 profundc constrictuni ; sinu lineari ; seniicellulis augulis inferioribus rotuudatis, cytiodermate 

 glabro, hand punctuto. 



Diam.—M&x. long. ^U" = 0.002G" ; hit. ^l^-' = .0019". 



iS'yn. — C. C'ucumis, C'orda. Rabenhorst, Flora Europ. Algarura, Sect. III. p. 161. 



Hab. — South Carolina; Georgia; Florida; Bailey. Pennsylvania; Wood. Saco Lake, (Lewis.) 



Oval or elliptic, at each end broadly rounded, one-third to twice as long as broad, profoundly 

 constricted; sinus linear; semicells with their inferior angles rounded ; cytioderm smooth, 

 not punctate. 



Remarks. — This species is very abundant arounil Philadelphia. The semioells 

 generally each contain two large globidar masses placed near the median line, 

 which are sometimes hidden by the crowded endochrome. 



Figs. 15, 15 a, pi. 12, represent this species with their endochrome in different 

 conditions; 15 Z>, represents a monstrous frond, which had attem-pted to divide, hut 

 had not succeeded in so doinir. 



C depreitiisiini, Bailey. 



" Ellii)tical, binatc, division in the plane of the longest a.\is. Segments entire, nearly twice as 



long as broad, ronndcd above, very mucli flattened at baae. 

 Hab. — Lakes in Florida. 



This species resembles C. bioculnlum, Breb. ; but the segments are much closer together, and 

 are angular, not rounded at the basal extremities." Bailey. Microscopical Observations. 

 Smithsonian Contributions. 



€. pyrniiiidadiiii, Breb. 



C. mediocre, ovale vel subovale, ntroqne polo truncatum, medio profunde constrictum, duplo 



