372 Takeda.—On Carteria Fritschii , sfi. nov. 
ment. The flagella seem to be stretched almost straight (cf. Fig. 3) and 
are often plainly visible. On the other hand, during the forward movement 
the flagella are scarcely visible. 
Since the first note 1 on the backward movement of certain Chlamy- 
domonads was written, the writer has had opportunities of examining living 
specimens of several species of Chlamydomonas and Carteria. It has been 
found that in most cases these organisms occasionally swim backwards. 
It appears that this kind of movement is fairly general amongst the 
Chlamydomonads, although it is possible that certain species do not swim 
backwards at all. Even amongst those which occasionally move with 
the posterior end forwards, some show this feature more frequently, or 
swim for a greater distance than others. 
Diagnosis. 
Carteria Fritschii , Tak., sp. nov. (Figs. 1-10). Cellulae vegetativae 
(= zoogonidia) parvae, ovoideae vel subglobosae, interdum obovoideo- 
ellipsoideae, raro a latere paulo compressae ; membrana cellularum exteriori 
firma ad § 11 crassa, in polo anteriori paullulum producta, sed sine papilla, 
membrana interiori (= parte membranae gelatinosa) saepissime valde et 
inaequaliter evoluta. Flagellis corpore cellulae paulo longioribus, e rostro 
plasmatico minutissimo in quatuor directiones radiatis. Chromatophora 
singula, viridis, urceolata, granulata ; pyrenoide singulo, sphaeroideo vel 
subanguloso, conspicuo, in parte posteriori cellulae posito ; stigmate ovali 
in parte anteriori cellulae ; vacuolis contractilibus duobus, anterioribus ; 
nucleo in parte subanteriori cellulae. 
Propagatio : cellula matricalis in unam vel duas directiones longitu- 
dinales in duas vel quatuor dividit. 
Long. cell. 15-20 /a; lat. 11-19 fi. Long, flagell. 17-22 fx. 
Grege C. multifili (Fres.), Dill, collocanda, a qua cellula minus rotundata, 
membrana exteriori crassiori, membrana interiori saepissime bene evoluta, 
flagellis brevioribus satis distinguitur. 
Hab. In sphagnis, Keston, Kent (F. E. Fritsch, 1915). 
The writer wishes to express his thanks to Sir David Prain, C.M.G., 
C.I.E., for allowing him to carry out the present investigation in the Jodrell 
Laboratory, Royal Botanic Gardens, Kew. He also takes this opportunity 
to thank Professor G. S. West, of Birmingham, for valuable help. 
1 Takeda : Ann. Bot., vol. xxx, No. cxvii, January, 1916, p. 157. 
