1 K i:s ll-WATER ALG-E OF T II K UNITED STATES. 113 



of them, however, are a little more curved in the central portion than it would 

 imply. 



l-'ig. 1, pi. 1:3, is a drawing of an American plant, magnified 160 diameters. 



4 '.Cur ii mi*, KIIKH. 



C. oblougum, turgidura, levitcr cnrvum, laeve, diametro 4-7 plo longius, apicibas obtusis. (R.) 



Syn. C. Curttmia, KIIUKNBEUU, Verbreit b. 28, IV. F. 28. RABENUOKST, Flora Europ. Alga- 

 rum, Sect. III. p. 138. 



Hab. New York ; Ehreubcrg. 



Oblong, turgid, slightly curved, smooth, 4-7 times longer than broad, the apex obtuse. 



/,'< >/! //..- . I have no knowledge of this species other than that in the above 

 short description, which has been copied from Itabeuhorst's works. 



3. Cellulx gemilunares, plerumque mayis curvatte quam in Seel. 1 et 2, venire semper tumidr, 

 ventricoso-injlalee. 



3. Cells semilunar, mostly more curved lhan in Sect. 1 and 2, wilh the belly always tumid, 

 venlricosely injlaled. 



C. Ehrenbergii, MENOII. 



C. fusoidco-scniilunare, ventre inflate, ceterum nt in C. Lunula. (R.) 



Diam. Lat. jjjfo" - .0029". Long. ,JJ 5 " = .0042." 



Syn. C. Ehrenbcrgii, MENCJII. RABENHOBST, Flora Europ. Sect. III. p. 131. 



Hab. Prope Philadelphia. 



" Frond large, stout, about five or six times as long as broad, Innately curved, extremities taper- 

 ing ; upper margin very convex, lower concave with a conspicuous central inflation ; ends 

 broadly rounded; large granules, numerous, scattered ; fillets several; e. f. colorless, without 

 stria;, central suture not evident. Sporangia orbicular, smooth, placed between the but- 

 slightly-connccted empty conjugated fronds, the cndochrome during the process of conjuga- 

 tion emerging from the opened apex of a short conical extension from each under side of each 

 younger segment (or shorter cone) of each pair of recently divided fronds, the conjugating 

 fronds being produced immediately previously by the self-division of a pair of old fronds two 

 sporangia being thus the ultimate produce of the two original fronds. L. S V; B. ^Jo"- 

 Archer." Pritchard's Infusoria, p. 748. 



Remark. Fig. 2, pi. 12, represents a plant of this species magnified 160 dia- 

 meters. 



C. moniliferiim, (BOBT) Kuan. 



C. semilunare, plus minus curvatum, diametro maximo 6-9 plo longius, ventre inflato, ntroquc 

 polo Bonsim attenuatnm, apicibus achrois obtnsis, vesiculis cblorophyllaceis in scric unica 

 longitudinal! axili dispositis, in quoque crure 7-10; locello apical! submagno, corpnscula 

 nnmerosa includente (corpusculum in quoque locello unicum mobile ellipsoidcum, magnitudine 

 linese partem millesimam eequans, cetera mobilia per totum corporis distributa observavit cl. 

 Perty.) (R.) Species mihi ignota. 



Diam. 0.0019" 0.0022". (R.) 



Syn. C. moniliferum, RABENFIORST, Flora Europ. Algarum, Sect III. p. 131. 



Bab. Georgia ; Rhode Island ; Bailey. 

 15 June, 1878. 



