288 МВ. G. S. WEST ON SOME CRITICAL GREEN АТС А. 
In October 1906 a collection of Algæ was made from a small pond in 
Studley Park, Warwickshire, which proved rather rich in some of the more 
minute species of the Protococcacee, One of these minute Alge Т have 
regarded as Chodatella quadriseta, Lemm. 
The cells were elliptie-oblong. or oblong with rounded extremities, about 
14 times longer than their diameter, and furnished towards each pole with a 
pair of widely divergent spines. The spines were attached not «t the poles, 
but rather below them, and were so widely divergent as to appear almost 
laterallv inserted. Thus the breadth of the Alga is considerably greater than 
the length, if the spines are reckoned in the measurements. The cell-wall 
was very delicate, and a large chloroplast occupied the greater part of the 
interior of the cell. As this chloroplast was toa great extent pressed up 
against the inner side of the cell-wall. it is parietal. Tt should be noted, 
however, that in many individuals two chloroplasts were present, one disposed 
towards each end of the cell, a condition most probably brought abont by a 
separation of the original chloroplasts into two parts!. No pyrenoids were 
present in any individual examined. 
[n his description of the genus, Lemmermann states: > Chlorophora 
singula, parietalia. Nucleus amylaceus singulus.” 
As the specimens from Studley Park often possessed two chloroplasts. and 
no individual was noticed with any trace of pyrenoids, this statement requires 
modification, It is also fitting to once more point out that the presence or 
absence of pyrenoids in the chloroplasts of Green Algæ has no value as a 
generic character. 
Lemmermann’s description of Chodatella quadriseta is very brief :— 
“ Cellule ovales vel subglobosæ, 4 w latæ et 55 p longæ, utroque polo 2 setis 
cire. 15 р longis instructæ.” It gives one the impression that the setze. are 
attached actually at the poles of the cells. The specimens from Studley Park 
had a length of 575-8 р. а breadth of 8-4-5 p, and the spines were 15-1775 p 
in length. They occurred in a habitat precisely similar to that in which 
Lemmermann discovered the species near Leipzig in 1898. 
No reproductive stages were observed, and, owing to the relative scarcity 
of the species among а vast multitude of other minute green Algæ, | was 
unable to make cultures which were not at once choked with other Proto- 
coccoider. In fact, I was never able to find any Chodatella except in the 
original material. 
' The fragmentation of the chloroplast in certain of the Protococcacer is not at all 
uncommon; vide Ankistrodesmus faleatus (Corda) Ralfs, var. mirabilis, G. S. West, Treatise 
British Freshw. Alge, 1904, р. 225, fig. 94 Ka (= Ллар ит polymorphum, Fresen., var. 
mirabile, W. & G. S. West in Journ. Roy. Mier. Soc. (1897) p. 501, t. 7. ff 9-13). Consult 
also Ankistrodesmus fractus (= Rhaphidium fractum, W.& G. S. West in Journ. Linn. Soc., 
Jot. xxxiv. (1899) р. 284); and Ankistrodesmus Chodati (= Rhaphidium Chodati, Tanner- 
Fullemann, in Bull. Herb. Boiss, sér, 2, vi. (1906) p. 158, fig. 11). 
