238 



THE HAEMOFLAGELLATES 



well-marked myonemes. Prior to gamete-formation, both gametocy tes 

 come into relation with the leucocytes, in an unusual manner (see 

 under " Habitat," p. 205), and lose all trace of locomotor organellae. 



Microgamete - formation, maturation 

 and fertilisation of the megagamete 

 (Fig. 27), in the gnat, present nothing 

 unusual. Instead of an ookinete 

 giving rise to a single Trypanosome, 

 as in Trypanomorpha, it grows con- 

 siderably, forming a large coil, and 

 nuclear multiplication goes on actively 

 at the same time (Fig. 28). Ulti- 

 mately, an enormous number of little 

 spirochaetiform parasites are pro- 

 duced, which populate the alimentary 

 n,i<SSe! ol y 't^SGWk&S tanal th e gnat. 

 "hfSg ftfitr.tf& . Criticism of this remarkable work 



is based mainly upon the realisation 

 that, in such a complicated study, 

 there was a grave source of possible 

 that this was eliminated. 



The opinion has been very generally expressed that Schaudinn 

 did not sufficiently guard against the liability of confusing and 

 mixing up the life -histories of entirely distinct parasites. In 



FIG. 27. 



the 



Schaudinn.) 



error, and there 



are " the right - (Aft(>r 



is 



nothing to show 



c. 



Growth and metamorphosis of an indifferent ookinete ; in C nuclear multiplication is \voll 

 advanced. (After Schaudinn.) 



the first place, it is said that in the species of owl used at least 

 four separate Haematozoa occurred : two free parasites, namely, 

 a Trypanosome and a Spirochaete (" Trypanosoma " ziemanni] ; 

 and two intracellular ones, a Halteridium and a Leucocytozoon. It 

 may be at once admitted that this is quite possible. At any rate, 

 the entire subject is reopened and cannot be settled definitely until 



