12 NOTES ET NEVUE 



Tu view of this necessary addition to our original description, I 

 shoiild like to point out'that I liave a dcfinite recollection of observing 

 occasionally — by no means often — a slight but distinct fiickering, of 

 a spasmodic character, at the right side of the body, near to the anterior 

 end ; and in regard to this. Di-. Lapage concurs. But so frequently, 

 when we had a promising individual before our eyes, gliding along 

 quietly but stead^ly, we hâve not detected the slightest sign of movenient 

 at the anterior end, that we came to the conclusion that the impression 

 W3 sometimes obtained was but the expression of a slight metabolic 

 movenient of the protoplasm in this région, similar to those commonly 

 occurring in this Flagellate, as we hâve already described. 



Recently, I happened to be watching an individual of H. major 

 (the larger type, which we distinguished as a separate species), which 

 had croppcd up sparingly in an original culture, made for other purposes, 

 when I caught sight clearly of a délicate, very short, curved flagellum- 

 like process, projecting on the right side of the body, at the anterior end 

 (text-fig. 1). It was most difïicult to keep tlus in focus as the Flagel- 

 late travelled, even though it was gently gliding in one plane. Folio w- 

 ing this individual closely, I observed that the minute flagellum would 

 be kept rigid and immovable for aperiod, and then would wave stilfly 

 and somewhat slowly to the side of the body and back to its former 

 position. Its behaviour is thus very différent from that of the ordinary 

 bending, vibratory motion of the anterior flagellum of Bodo or Cerco- 

 monas. Having once detected this délicate accessory flagellum, I Imew 

 exactly what to look for — a point which is of considérable assistance 

 in the discernment of such mnute orgainellae — .and was able to see it 

 in other individuals also ; but in spite of niy efforts, I could not detect 

 it in by any means ail. I next obtained a culture of the original (smaller) 

 form, H. faecicola, and succeeded in observing this flagellum in a pro- 

 portion of the individuals in the case of this species also. Fortunately, 

 Dr. Lapage happened to be in London at the time and he fully confir- 

 med the discovery. 



This much can certainly be said, in part exténuation of our failure 

 to observe this accessory flagellum before. It is not of constant occur- 

 i-ence ; not présent, that is, in ail individuals. Its absence in some cases 

 prevented us from verifying our tentative suspicions and led us to con- 

 clude there was only the long, trading flagellum. Even when présent, 

 this second flagellum is most difïicult to see. I hâve had this fact corro- 



