298 THE JOURNAL OF BOTANY 
[Syn. S. proboscideum a var. glee Boldt in Ofvers. af K. Vet.- 
Akad. Férh. 1885, no . 117, t. vi. f. 84; S. altum Schmidle in 
Bih. till K. Sv. Vet. eee aide 1906, Bd. 24, Afd. iii. no. 8, p. 62. 
f rge 
all forms of S. Sebaldi. It only differs from the type in the promi- 
nent convex apex, the arrangement of the spines and emarginate 
verruce being the same 
PaLMELLACER. 
SceneDEsmus arncuatus Lemmermann in Pléner ee 
Sestaided Teil 7, p. 17, t. i. f. 2-4. This is merely a form (by no 
means an uncommon one) of S. bijugatus (Turp.) Kiitz. 
38. Raapnipium poLymMorpHum Fresen. var. mmraniLe West & G.S. 
West in Journ. Roy. Micr. Soc. 1897, p. 501, t. vii. f. 9-13. In a 
recent paper by Teuton (l.c. p. 29) that a has placed 
this variety as a distinct species—R. ‘nirabile Lemmermann. In this 
he is absolutely wrong. When we described the iat, we illustrated 
and the var. “epee {One of these stages we fig : cfr. West & 
G. 8. West, /.c. f. 12.] Finally, we feel bound to ae that there 
is not the Agee evidence for regarding it otherwise than as a 
peculiar form of fi. poly morphum. 
absence of pyren H arks : i a dagegen 
eine Pyne where as we erequonkls ee “ose in species 
of Rhaphidium, and also in the allied genera Scenedesmus and 
Dactylococcus, Moreover, he includes Cline subtile Bréb. as & 
Species of Closterium, whereas it has unques ee been proved to 
be Rhaphidium polymor ine var. aciculare (A, B abe 
ote. —In the same paper, which is entitled ‘Das Phyto- 
plankton ouongen Teich, Lemmermann has described a plant 
which he nam pone iopsis bigtime He places this plant in 
the Pumice % tween Closterium a: 
opsis, whatever it may ay is cer vidoe not a Desmid, wets robably it 
is a . of the nature of R. longissimum Schréd 
- Oocystis Marssonn Lemmermann in Bo bl. 1898, 
Bad. eo p. 151; Ploner Forschungsb, Teil 7, p. : Ne a 15-19. 
We fail to see how this species can with any reason be distingnished 
from Oocystis crassa Wittr. in Wittr. & Nordst. Alg. Exsice. 1879. 
