FKKSH-WATi: K A Mi.K OK T1IK I' N 1 T V. 1> STATi 



fere lon^ius i|ii:iin lutuin ; M'liiicrllulis lireviter pyriiinidiitis, angiiliH inferiiirilnis rotumlatis, 

 apiee (dur-uj iinulo triincatis modo rolumlali.-, a \criico laic clliplicis ; cytiodcriimtc punc- 

 tilio vel siibtilis.-iiiic jrraniilato. ( I! ) 



I _- MMl" 4MS7". I.at. iimx. 0.0026". 



,S'y/i. C. pyramidal urn, HKEIIISSH.N. KAIIKMIORST, Flora Europ. Algarum, Sect. III. p. 1C2. 



Huh. (Jeor^ia ; Florida; Bailey. Pennsylvania ; Wood. 



Frniid searccly twice as loutf as broad, subnval ; constriction deep, linear; segments pyramidal, 

 rounded at basal anirles, somewhat truncate at llie ends, punctate ; e. v. broadly elliptic. (A.) 



Remark. Fig. 14, pi. 13, is a drawing of this species. 



C. Iio< ulaliiiii. I'.IIKII. 



C. parviicr, eirciirr lam Inngum qnnm laiuni vel paulo Inngiun, profundc conslrictum, sinu ex- 

 trorsuia ainpliato ; scraiccllulis diainetro duplo latiorilms, elliptieo-prope lie.\a<r<niis angulis 

 obtuse rotundatis, integerriaiis aut Icvissimo crcnulutis ; cytiodermate laevi vel sublilissime 

 punclato. (11.) Species mihi ignola. 



Long. 0.00069". Lat O.OOOC6". (II.) 



Syn. C. bioculatum, BREBISSON. RAIIENIIORST, Flora Europ. Algarum, Sect. III. p. 1C3. 



7/ ( ;/;._Rhodc Island, (S. T. Olney) Thwaites. 



Frond minute, about as long as broad, constriction deep, producing a gnping notch at each 

 siile ; segments about twice as broad as long, elliptic, smooth; s. v. compressed s. v. elliptic. 

 Sporangium orbicular with conical spines L. -H'JB" ; B. TT'TC"- (A-) 



C. ITIenr^liriiii, HKEB. 



C. parvum, tain longum quam latum, modo paulo-longius, modo paulo-brcvius, profunde eon- 

 striclum, sinu linear!, cxtrorsum non amplialo ; sciniccllulis subqnadratis, Icvitcr sinuato- 

 hexagonis ; angulis rotundatis, cytiodermate lev! vel subtillissimc punctato. (11.) 



Long. ,V"~fV"= 0.00103" 0.0013"; lat. jJ/'-^J,'" - 0.00081" 0.00089". (R.) 

 ,s'y,i. C. Meneghenii, BREBISSON. RABENUURST, Flora Europ. Algar., Sect. III. p. 163. 

 Hab. Pennsylvania ; Wood. 



Frmid very minute, rather longer than broad, constriction linear; segments subqnadratc, bicre- 

 ua te at the sides and ends, smooth ; e. v. elliptic. (A.) 



HI mark. Fig. 18, pi. 12, represents a frond of this species, magnified 750 

 diameters. 



C. crenatum, RALPS. 



C. oblongum, tertian) partem circa longins quara latum, profunde constrictum, sinu linear! an- 

 gusto ; semicellnlis e basi lata subsemicircularibns, dorso plus minus depressis ycl truncatis, 

 anibitu crenatis vel regulariter undulato crenatis, crenis 10-14; cytiodermate punctato. (R.) 

 Species mihi ignota. 



Long. 0.0021" 0.0023"; lat. 0.0015". (R.) 



Syn. C. crenatum, RAI.FS, British Desmidiea:, p. 96. 



Hob Rhode Island ; (S. T. Olney) Thwaites. 



Frond slightly longer than broad, constriction linear ; segments semiorbicular, ends and sides 

 broadly rounded, crenate or minutely undulate at margin ; c. v. elliptic. Sporangium orbi- 

 cular, spiuoas ; spines elongate, slender, swollen at the base and divided at the apes. L. 4 1 " ; 



