FRESHWATER AL<i.E. 55 



PLATE I. 



FIGS. 1-5. L'lil'iiiii/-l"iii<iii<ix tiihi-niiiliitd Wille, ordinary individuals, </. description, pp. T. s : /'. pvrcimid : 



ii = nucleus, (x TIKI, i 

 FK;S. (i-K. Chlamydomonas subcaudata Wille, encysted individuals. In tigs, i; ;nn] T tin.' original shape 



of the mother-cell membrane is easily recognised ; in figs. ,s-ln the cysts show the 



processes dc>< Tilled on \i. * ; ]> = pyrenoid ; // = nucleus, (x Ton.) 

 FK.S. 1 1-1-J. Chlamydomonas ^nln-nn l:iln Wille, free cysts; in tig. 1 1 the cysi contains tun jn reimids. 



(X Tun.) 

 Fn;s. 15-18. C/iliii/u/i/n/i/n/ii/s iiifrr/iii'i/iti (Tiod., ordinary individuals; ji = pyrenoid ; n = uueleiis ; * - 



contractile vacuole ; * = stigma, (x l">5n. i 

 FK;. 11). l.'lilitmyilumonas e/ire/ibergi Goroscb., ordinary individual ; p = pyrenoid ; /' = nucleus. 



(X Tun.) 



Fn;. io. Oiiliiiiiijiliinininia mlinniiltilii Wille, c\>t showing division of contents into four pans. ( \ 7 , 



Fics. il-i5. ChloroniiHKix ////inn/ \\'ille ; // = nucleus ; s = eye-spot. In most of the individuals the 



cilia could not ho traced to their full length, (x l:'.5ii.) 



Fn;. I'd. J'/i'uriii-nirtin anl<iirti<-nx \\ . and (',. S. West, f. li//>i<-ii : n = oil-globules, (x 55o.) 

 Fin. L'T. .. ., f. iiiiiitir. (x 550.) 



Fn;. is. .. f.jiliiiiii'iitnxit. (x 550.) 



Fi<;. i".. .. f. xf rlltt.fi/. (x soo.) 



FlGS. 30, 31, 33. .. .. ., f. siiiijiles ; ii = oil-glolmles. (x55o.) 



Fli!. '.'>!. ., ., f. (///'/''', a group of ;i[ipi'ccialily larger cells tliali 



those in Fig. L'I;. One ol ihese cells has two pyrenoids. (x 4oo.) 

 FK;S. :!I-:15. ---y > A'//c' 1 wr//.v ti/i/nrr/irtis \\'. and (i. S. AVcst, f. nilm^ln, elliptical cells, (x 5oo.) These 



are relatively small cells nf this form. 



l-'n;. 36. Plei/rni:o/rii.t knHHilzi sji. n.. grou]i of cells seen at a low magnification. (X 2io.) 

 Fins. 37-4-i. I'lninii-iii'riis /:i/r/t/i/:i sji. n. : 37, 39, 41, ordinary tetrads; :'>s, small part of group shown 



in tig. ::<; ; lo, development of daughter-cells within mother-cell ; Ii. develr,]ime I 



dangliter-cells within mother-cell, some of the cells of the tetrad are abortive. 



(3!), to X 500 ; other lignres x 4oo.') 



FliiS. I:',. It. I'li'iirnrnri-iixfriiiiihia \V. and (i. S. West. (X loo.) 

 Fins. 45, 40. J'riiii/ni sp., !-f. pp. id, il. (x 500.) 

 FKIS. IT. is. /-Jin-nfi/iifi niiiuttasp.il. 47, Surface view of an older colony to show grouping nf cells 



(X isoo) ; 48, Diagram of eight cells of colony to show the cubical arrangement 



(magnified about 4000 times). 



Fios. 4D-51. Merismopedia tsnuissima Lemm. ; I '.I, young colony ; 5o, 51, older colonies, (x llon.i 

 FK;. ^'.J'liiiriiiiiUi/iiifiii/ii/inn sp. u. (x 18on.) 



Fn;s. 5:;, 5 I. I'/mm/ii/iiim luihniuinl,- (Ag.) (lorn., apices of two tilaments. (x TOO.) 

 Fins. :t:i-M.Oxi-illt/fnriii /,iH'!//i/;i sp. n. ; 55, 57, 5s are lypical triehomes. (X TOO.) 

 Fn;s. do ill. -Osf i/lnliiriii xiiiifilii-i^iinn (Join., var. i/ntnrrli'-it var. n. ; I'.i. f. in-iiiiiiiintii ; ill. f. Sjiiralit ; 



114, tricbome overgrown liy lilaments of /'/inrniii/iinit angustissimum. (X 55o.) 

 FK;. l!5. < i.^'il/tt'uriif /ir/'i/iniit \\ . and ('. S. West. (X son. i 

 FK;. Hi;. Kiili/irn/m^ii/i'ii \\'. and (i. S. West, (x 800.) 



FIGS. (1T-TO. Jfii-i;n-i/x/ii< /xiriixil/fii Km/.. (X Too.) 

 FlGS. ~,\-1?>.riirini<lii<iii unlairlinim \\ . and (i. S. West, forma. (11, Ti, X s5o ; T:i, X 1800.) 



