FRES II -WATER ALG^E OF THE UNITED STATE 8. 115 



Syn. C. I'enus, KtrziNU. RABENUOHST, Flora Europ. Algarum, Sect III. p. 134. 

 llab. South Carolina. (Raveacl.) 



Small, more or less slender, semicircular, eight to twelve times longer than broad, equally and 

 very |>erre|>iil>ly ultenuate ut both apices; cytiodenn tliin, smooth; chlorophyllou8 lamina 

 obliterated ; vesicles in each crus 3-4; vacuole distinct, containing 4-C corpuscles. 



Remark. Fig. 7, pi. 1 1 , represents iii outline a frond magnified 450 diameters. 



< . parvuluni, 



C. parvnin. scmieirculare, medio non tumidnm, grncile, anguste lanceolatum, sexics-octies lon- 

 jrius (jiiaiu latuin, apicibus acutis; cytimlcrmatc trnui, lu-vissimo, vacua! o nonnunquam luteolo- 

 fu.tcesccnte et subliliter striato ; vesiculis uniseriatis, in quoque crure 2-4, varius 1-7 ; lumiiiia 

 chlorophyllaceis 4-5. (R.) 



Diam. Max. O.OdUi'G" .00062" (R.) (.0008" W.) 



Syn. C. parvulum, N.-KiiKi.i. RABENHORST, Flora Europ. Algarum, Sect. III. p. 134. 



Hub. Prope Philadelphia, Wood. 



Small, semicircular, not swollen in the middle, slender, narrowly lanceolate, six to eight times 

 longer than broad, with the apices acute; cytioderm thin, very smooth, when empty some- 

 what yellowish-fuscous and finely striate ; vesicles uniseriate, in each crus 2-4, rarely 1-7; 

 chloroplivllous lamina 4-5. . 



/,' marks. I have referred to this species a desmid which I have found about 

 Philadelphia, and which agrees in all respects with the description of Prof, llaben- 

 horst except in attaining a larger size. 



Fig. 5, pi. 12, represents this plant magnified 450 diameters. 



. Jennerii, RALFS. 



C. cylindraceo-fusiforme, Bemilunare, Iseve, ntrinque modice attennatnm, seiies-octies longiua 

 quam latum, apicibus obtuse rotundatis; vesiculis in quoque crure 5-7, in serie unica axili 

 disposals; lamiuis chlorophyllaceis 2-3; locello subaequali magno, corpuscnlis numerosis 

 inipleto. (R.) 



Diam. 0.00057". (R.) 



Syn. C. Jennerii, RALFB. RABENHOROT, Flora Enrop. Algarum, Sect. III. p. 134. 



Sab. Rhode Island, Bailey. 



Frond small, distance between the extremities six or seven times the breadth, crescent-shaped, 

 much curved, gradually tapering (sometimes with an obscure central constriction) ; upper 

 margin very convex, lower very concave without a central inflation ; ends obtuse, rounded; 

 large granules in a single series; e. f. colorless without striae. L. ,J T ". B. TT "J O ". Archer. 

 Pritchard's Infusoria. 



b. Zygosporu plerumque quadrangulares, cellularum crura longe vel longissime producla, 



strpe eetiformia. 

 b. Zygoepores mostly quadrangular, crura of the cells greatly produced, often setiform. 



C. rofttratiim. EHRB. 



C. eorpore lanceolato-fusiformi, utrinqne valde et longe attenuate, leviter cnrvato, striato ; cor- 

 nibus setaceis singulis corpus vix teqnantibus, stepius longe brevioribus; cytiodermate dilute 

 un>brino vel luteolo, dense striato : vesiculis nniseriatia, in quoque crure 5-6; locello oblongo, 

 sepias indistincto, corpusculis 12-15 vivide se moventibus. (R.) 



