542 NEW AND RARE FRESHWATER ALfiiE, 



Fij^.'iG. — CJifo/'Oj/oniitm minimnm, n.sp. ; ( x 1330). 



ritf;s. 27, "28. — Pfei'omona.-< am/ulom var. auMraJis Playf.. foniia; ( x 1000). 



ri,i^.29. — /-*/. anfjiilo>ia var. ■■<cn1ifornu>i. n.var. ; ( x 1330). 



Fi,u'..3(». — Pt. (iiKjulo.sn var. i-f.vi1Hforini-<, n.var.: ( x 1330). 



Plate Ivi. 

 Fit's. 1-3.— .S'?///»/v/ ;/raini/o-^<i Playf.: (1) elongate Cienobium witli zooids 



attaclied to a central mucous peduncle ( x 060) ;. (2, 3) individual 



zooids showing one or moie dark red granules near the anterior end 



( X 1000). 

 Fig. 4. —TexseJIarla ro/rocina Pla3'f., supposed free zooid; { x loOO). 

 Figs. 5, 6. — Xanfhod/^iciis Luuferbadii Scliew., (so-called); (o) face-view of 



a preserved specimen with shrunken contents showing central 



nucleus, but no chlamydomonadine arrangement of the chromato- 



phore; (G) sideview; ( x 1000). 

 Figs. 7. H. — Phacotn.^ rra.^-sii>i, n.sp., ( x 1000); (S) sidevicAv. 

 Figs.9, \(). — fVi. (ilaher, n..sp., ( x 1000); (10) sideview. 

 Figs. 11, Vl.~Pk. cj/aher, formc-e; ( x 1000). 

 Figs. 13, 14.— PA. anstralk, n.sp., ( x 100(»); (14) sideview. 

 Fig. 15, — Spondi/Iomorum qnaternarinm Rhr. : ( x 1000). 

 Figs. 10, 17 — Sp. quale rnarhim var. roslrahiin,n.ya.\\,[ x 1000); (10) bunched 



ecenobium; (17) rosette-form. 

 Fig. 18. — Vol I'll/ i na Steinii Pla,yi., single cell of a crcnobium, in sideview, 



showing nucleus, contractile vacuoles, and stigma in the usual 



chlamj'domonadine positions. 

 Figs. 19, 20. — Volrox aureus var. hemiyj/uericn.^, n.var. ; (19) cells from 



above ( x 660); (20) three cells in sideview ( x 1000). 

 Figs.21, 22 — Volrox Carte.ri Stein; (21) immature zygote as described by 



Carter ( x 660); (22) mature zygote ( x oOO). 



Plate Ivii. 



Fig.l. — EJakatothrix (lehitinom Wille, isolated cell; ( x 1330). 



Fig.2. — E. gekitiiiosa, mucous matrix with newly divided cells; ( x 1000). 



Figs. 3, 4. — Dactyl othecearciiatiLm,\\.^\)., two cells, of many noted, involved 

 in a mucous matrix ( x 1330); (3) face-view; (4) sideview. 



Fig. 5. — E7'emosphc(ira viridis yslv. tetraedrica, n.var.; ( x 270). 



Figj^. — Oocystis rotnla Playf., mother-cell with autospores; ( x66<)). 



Fig. 7- — 0. rotnla, autospore; ( x 1100). 



Fig.8. — 0. /acmtris var. nafaus (Lemm.) Playf , mother-cell with auto- 

 spores; ( X 660). 



jritr.9. — 0, (acnstris var. natans, autospore, showing fragmented, reticu- 

 late chloroplast; ( x 1000). 



Pig. 10. — Franceia ohhnga, n.^i).; the settv are, for convenience, figured 

 much shorter than natural ; they should be as long as the cell ; 

 ( X 1330). 



