1<) NOTES ET REVUE 



Alexeieff notes the occurrence of two flagella, although, as 

 above mentioned, he does not figure an individual showing both. 

 The author cvidently had considérable difficulty in seeing the flagella. 

 As I stated in my account, Spiromonas is one of the most active of copro- 

 zoic Flagellâtes, and when in rapid motion, it is impossible to detect 

 the flagella. It is also, however, one of those which require most air, 

 and in an ordinary cover-slip préparation (not an observation-prépara- 

 tion), the Flagellate very soon becomes languid and its movement ceases. 

 As this happens, it is quite easy to observe both flagella ; just as easy 

 as it is to see the anterior, vibratile flagelkim of Bodo and Heteromita, 

 when thèse are at rest. While the two flagella of Spiromonas (or Alpha- 

 monas) are certainly more slender than the powerfal anterior flagellum 

 of Cercomonas, they are not so délicate and difïicult to see as is the pos- 

 terior, trailing flagellum of this type, when the posterior, end of the body 

 is not drawn out along it. And the détection of the short accessory 

 flagellum of Helkesimastix is a far greater test both of the lens and 

 one 's own acu'ty of vision ! The sub-equal flagella of Spiromonas resemble 

 most nearly those of Bodo (cf. caudatus) {vide my figures, pi. 27, 1. c). 

 Alexeieff's description of the mode of movement of the body in Alpha- 

 monas agrées exactly with that of Spiromonas. 



In regard to the size, the variation in size of the smaller forms, the 

 characteristic spiral shape and gênerai appearance, the remarkable 

 deeply staining mass in the posterior half of the body of the large forms, 

 and the mode of multiplication, Alphamonas agrées completely with 

 Spiromonas, and no more need be said upon thèse points. A comparison 

 of my account ancl figures with those of Alexeieff settles the question- 



In one or two respects, however, Alexeieff's description is incomplète 

 or at fault. Division is not only quadii-partite. I hâve found that it 

 is much more commonly tri-partite, three daughter-individuals being 

 formed inside the cyst. Moreover, a definite cyst-membrane is présent ; 

 this is very délicate, but unmistakeable {vide my fig. 65. pi. 28, 1. c). 

 As mentioned in my account, somet'imes the daughter-individuals, at 

 th(; time of libeiation. scpiinii out of the cyst successively, at the point 

 whei'e tins is luptiircd. In my own account l also pointcd out that 

 Martin ajid Lewin's fig. ;j7 jclated in ail ))rol)ality to Spiroftionas ajid not. 

 to Bodo caudatus ; and in their figure also, wliat appears to bc the empty 

 cyst is shown. 



As regards the peculiar inclusion, wliich in staincd préparations is 



