BY fi. I. PLAY FAIR. 543 



Fig. 11. — Lafjerheimia eUiptica, n.sp. ; ( x 1330). 



Fig 12. — Bernardia fetraiidrka, n.sp.; { XlOOO). 



Figs.l3-1().— A'//r/<7K'?vV7/rt o^ft.^Y< W. & G. S, West; (xlOOO. 



Figs. 17, IS. — Titrai'drou ;/raiii(/o.siun, n.sp.: '17) face-view; ( IS) sidevieM' 



( X 1000). 

 Fig. 19. — Tetr. qiiadrdlnin f. minor Keiiiseli: ( X SOO). 

 Fig.2(>. — T^//-. qnadra/nm f. <jrara/(i, n.f. ; { X SOO). 

 Figs. 21, 22. — Tifr. r((iidafv/N xar. a it.-<l rah . ii.var.: (21) face-view; (22) side; 



( X 1000). 

 Fig.23. — Tefv. rej/n/are var. ortal-dricnrn (Keinscli) niilii; (x 1000). 

 Fig.24.— 7'(>//-. conirum, n.sp.; ( X 1000). 

 Fig.2o. — Tetr. minimum var. rectiliiieare Playf.: (x lOOO), 

 Fig.26.— Te/r. oUnmm, n.sp.; ( x 1000). 



Figs. 27, 2S. — T(tr. friyonnm Niig., forma; (27) face- view; (2S) side; ( XfifiO), 

 Figs. 29, 30. — Pediafffrnm simp/ex Meyen, 4-eelled forms; ( Xf)60). 

 Fig.31,— f*ef??. mn2)Iex f. orata (Ehr.) Pvacib.; (x660). 

 Fig..S2. — Pedi. Boryanum (Turp. ) Menegh., 4-celIed form; (X.3(K)). 

 Fig. 33. — Pedi. Dorijannm var. llayiaddii (Istv. ) milii: ( X ilOO). 

 Fig.34. — Pedi. Boryanum var. anMrale., n.var. ; (x(IHO). 

 Fig.3r>. — Pfdi. hiradiafii/ii var. /jVavr^r/ (Wartm. ) Cliodat ; (X(]r.O). 

 Fig.36.— P^r//. fefnts var. C'riiu- Mirluwli (Reinsch) I'layf.: ( X l(>Ol>). 



Plate Iviii. 



Spiroijyra nef//ecfa (Hass. ) Kiitz. 



Fig. 1. — Conjugated filaments with elliptic /.j'gospores and non-inHated 



sporangia! cells; (X220). 

 Fig.2. — Conjugated tilaments witii oval zygospores and inflated sporangial 



cells; ( X 220). Figs. 1 and 2 formed part of one and the same 



scalariform filament. 

 Figs.3-6. — Four types of zygospore in the one gathering (X 400) ; fig. .") 



(xr)00). 

 Figs. 7, 8. — Unaltered cells of a conjugated filament, with simple delicate 



chloroplast; (8) x 330; (7) chloroplast much enlarged. 

 Figs. 9, 10. — Long cell of a vegetative filament, with delicate, fimbriate 



chloroplast and minute pyrenoids; (9) chloroplast much enlarged; 



(10;x330; the fringed edge of the chloroplast is tof) delicate to be 



seen under this low magnification. 

 Figs. 11-13, — Cells with more robust, scalloped chloroplast; (11) chloroplast 



much enlarged; (12) short infiated cells probably about to conjugate 



(X 330); (13) long uninflated cell of vegetative filament (x330). 

 V\^sA4:-\6.- -Spirofjyra ne(j/ecfa var. amylacea, n.var., vegetative filaments 



and chloroplast; (14) long cell ( x330,'; (1.)) short cells ( x330); (16) 



chloroplast enlarged Conjugating cells and zygospores of this 



variation as in fig. 1, 



