312 DR. Е. E. FRITSCH ON FRESHWATER ALG.E 
form a number of new daughter-individuals, which often acquire the shape, 
spines, ete. characteristic of the mature form before leaving the mother-cell 
(autospore-development). The individuals of Chodatella brevispina were 
frequently found lying together in groups of four or more, and that may 
indicate formation from a common mother-individual, but no stages in the 
process were observed. In most other species of Chodatella the spines are 
very long, few in number, and mostly confined to the ends of the cell ; but 
there are two species (viz. C. echidna, Chod., and especially C. armata, 
Lemm.)* in which the spines are more evenly distributed and also of 
No other species of Chodatella, however, 
approximately equal length. 
In all the deseribed species the spines are 
bears spines all over its surface. 
very much longer than in the Antarctic form, and for this reason the specific 
name “ brevispina ” is proposed for the latter. In his description of €. ciliata, 
Lemm., Chodat f states that the cells are “souvent munies de quelques 
globules huileux polaires," so that the occurrence of fat has already been 
recorded in the genus. The species of Chodatella, lastly, have one (or 
more) ehloroplasts with or without pyrenoids. Оп the whole, therefore, the 
Antarctie form fits fairly well into the genus Chodatella, and, owing to its 
numerous short spines and abundant storage of fat, is regarded as a distinct 
species 1. 
Before passing on to the consideration of other forms it may be well to 
point out that there is some resemblance between Chodatella brevispina 
and the aplanospores of Chloromonas alpina $, found by Wille in green 
snow in Norway. Wille himself || refers to the resemblance of these 
aplanospores to Lagerheimia (a closely allied genus, regarded by many 
authorities as not generically distinet from Chodatella), but found transitions 
seeming to connect these structures with the ordinary motile cells of Chloro- 
monas alpina. As regards the resemblance between Chodatella brevispina 
and these aplanospores (apart from similarity in shape and size) it is purely 
superficial, for the latter have coarse pointed spines attached to the cell-wall 
by a broad base ; they contain many plano-convex chloroplasts and, although 
occurring in the same kind of habitat (on snow), appear to harbour no fat. 
If Wille’s interpretation of these structures is correct, there is a possibility of 
the individuals of Chodatella brevispina being aplanospores of some allied 
form; inasmuch, however, as Wille’s evidence for the connection of the spiny 
ж Chodat, * Algues vertes de la Suisse,’ 1902, p. 192; Migula, Kryptogamenfl. Deutschl. и 
d. Schweiz, ii. 1, p. 671, pl. 35 о. fig, б. Аз the Antarctic species is not a Plankton-organism 
like most other species of the genus, the relative shortness of the spines is comprehensible. 
+ Loe. cit, p. 192. 
{ A full diagnosis of Chodatella brevispina will be found on p. 326. 
§ Cf. Wille, “ Algologische Notizen, XL,” in Nyt Mag. f. Naturvidenskab. xli. 1903, p. 124 
& pl. 3. figs. 82-33. 
|. Loc. cit. р. 124. 
