PEATE: 244 
1. Nitzschia obtusa var scal- 
bo 
+ ww 
CONT CVU 
i 
I7- 
18. Cylindrotheca 
pelliformis Grun. 
», spectabilis (Ehr) 
Ralfs. 
5, linearis (Ag) WSm. 
‘ », °° War tenuis 
WsSm. 
,, vitrea Norm. 
,, lanceolata WSm. 
4. ,, forma minor. 
», Palea (Kutz) WSm. 
- ,, Var tenuirostris 
Grun. 
,, Communis Rab. 
,, amphibia Grun. 
5, longissima (Breb) 
Ralfs. 
,, longissima var Clos- 
terium WSm. 
,, longissima var re- 
versa WSm. 
,, longissimavarparva 
,, acicularis WSm. 
,, filiformis WSm. 
gracilis 
(Breb) Grun. 
19. Chaetocerosarmatus West. 
~ Wanicus Cl: 
,, Lorenzianus Grun. 
,, borealis Bail. 
», Peruvianus Bright. 
24. Bacteriastrum varians 
Lauder. 
25. DitylumBrightwellii( West) 
Grun. 
26. Chaetoceras Lorenzianus, 
bw OW) 
OW ww 
se 
1os) 
C2 Go Go 
Our 
vit 
28. Cyclotella 
Rhizosolenia 
endocysts of. 
,, diadema, spores of. 
striata (Kutz) 
Grun. 
5, antiqua WSm. 
,, comta var radiosa. 
», Operculata Kutz. 
», MeneghinianaKutz. 
», Kutzingiana Chau- 
vin. 
. Hyalodiscus stelliger Bail. 
», scoticus(Kutz)Grun. 
setigera 
Bright. 
,, alata Bright. 
