F UK S II -WAT KH A !.(;.!: OK T 11 K U X I T E D ST A TES. 99 



Cccnobium mobile, pl.ilxisc, subglobose or in square tables, composed of green cells which hare 

 two motile cilia ami a double cuiiiraciile vesicle. The common tegument surrounding the coeuobium 

 hyaline, ami more or loss amplified. 



Propagation either s \ual or non-sexual. The sexual moneciou* or diecioas; either all or some 

 of the cells of the coenohiuin exhibiting male and female characters. The male cells containing 

 tipcrmutozoids, the female finally converted into a quiet oospore. Non-sexual propagation taking 

 plan- by means of inutile gonidia (both tnacrogonidia and microgonidia, by some called zoogonidia). 

 Macro- and micro-gonidia arising by the simultaneous and repeated division of the cytioplasm ; the 

 Dr>t definite in number (2-4-8- 1C, Ac ), the larger, oblong or rounded, with the anterior end more 

 or le.-s ro.-tellatc, with two cilia exserted through the membrane of the reside, furnished with a cen- 

 tral or parietal red spot, and often with two contractile vaeuoles; the microgonidia indefinite in 

 number, much the smaller, pule or dirty green or luteolous, furnished at the apex with cilia, mostly 

 even within the mother-cell, moving rapidly, and finally escaping on the rupture of the membrane. 



Genus CHLAMYDOCOCCUS, A, BBAUN. 



f YllulfB globose, Tel subglobosae (48 in coenobium fugacissimnra conjunct), cytiodermate sub- 

 cra->o firnio, cvtioplasmate granuloso, fusco-rubro vel puniceo (in erolutionis gradibus quibusdam 

 in colon-Hi viridem mutato). Macrogonidia 2-4-8, rotundata, polo antico rostriformi producta, duo 

 cilia longissima gerentia, nucleo central! rubro, glubulis amylaceis 4-6, non semper visibilibus 

 in.-!ruei:i. te'.'uineiito aniplissirao byalino plerumque ovoideo vestita. Microgonidia miilto minora, 

 numerosa, lutcola rcl 8ordide viridia,- apice rubella, ciliis binis instructa, iutru tcgumentuui matri- 

 cali alaeriter vacillantia, denique meiubrunffi ruptura t-lubentia. (R.) 



Cells globose, or subglobose (4-8 conjoined in a very fugitive coenobium), cytioderm thicki.-h, 

 firm, eytioplasm granular, brownish-red or puniceus, in certain stages of evolution changed into 

 trreen. Macrogonidia 2-4-8, rounded, the frond end bearing very long cilia, furnished with a 

 lit ml reddish nuclei and with four to six, not always perceptible, starch granules, clothed with a 

 very ample, hyaline, mostly ovoidal tegument. Microgonidia much the smaller, numerous, luteolous 

 r sordid LTren. the apex reddish, furnished with two cilia, moving actively within the maternal 

 '.egument, and at last escaping by the rupture of the membrane. 



4 h. nit ali* (BAUER, Ao.). A. BRAUN. 

 Ch. globulis, 0.004" 0.00135". (R.) 

 Ilab. In nive tetcrna, Greenland. Rocky Mountains. 



ti'/ n. Ch. niralig (liAi it, Aa.). A. BaAUN. RABENHORST, Flora Enrop. Algaram, Sect III. 

 p. 97. 



Globules, 0.004" 0.00135" in diameter. 



Remarks. I have never seen any good specimens of this plant, merely some 

 n-lls mounted in Canada balsam, and therefore ruined for scientific study, which 

 had been collected by Dr. Kane in one of his Arctic voyages. I have also had 

 some indications of plants in a little parcel sent me by Mr. Sereno Watson, who 

 informs me he has seen the red snow very abundant in the higher peaks of the 

 Rocky Mountains. It is a matter of presumption rather than determination, there- 

 fore, that the soecies is identical with the European. 



Genus VOLVOX, EHBB. 



Coenobium exacte sphtericnm, continno rotatum et agitatum, globum cavnm quasi fingcns, e cel- 

 lulis nnmerossissimis equal! distantia peripheries dispositis, gelatina matricali connexiM, puncto 

 rnbro lateral!, locellig (vacuolis) binis contractibilibus necnon ciliis binis longe exsertis instructis, 

 vt-sica commutii hyalina circumcinctia compositum. 



