THE TUYPAN0S05IA BRUOIT. 469 



Fig, 5 (Oc. 12).— Larj^e hyaline form, stained deeply to show tlie iindulatinfr 

 membrane and its connection witii tlie micronucleus. From rat's blood, eighth 

 day. 



Figs. 0—8 (Fig. 6, Oc. 8 ; Figs. 7 and 8, Oc. 12). — Forms containing 

 granules, from blood from mouse's lung just after death on seventh day. In 

 Fig. G the macronucleus is still distinctly visible, but in Figs. 7 and S its 

 position is only just indicated. What happens further to these forms has not 

 been traced. 



Figs. 9 and 10 (Oc. 12). — Irregular amoeboid forms from blood of rabbit 

 on twenty-ninth day. In Fig. 9 the edge of the undulating membrane is 

 seen attached to the micronucleus, and then nearly surrounding the organism. 

 In Fig. 10 the flagellum and undulating membrane are quite developed and 

 distinct. 



Fig. 11 (Oc. 12). — Full-sized organism from rat's blood, sixth day, stained 

 deeply to show the undulating membrane and its attachment to the micro- 

 nucleus ; and also commencing enlargement of the macronucleus. 



Fig. 12 (Oc. 12). — From rat's blood, seventh day, showing the early stages 

 of longitudinal division. The micronucleus has divided, and a second undu- 

 lating membrane has developed. The macronucleus shows commencing 

 enlargement. 



Fig. 13 (Oc. 12). — From same specimen, showing the division and separa- 

 tion of the micronucleus, and the great enlargement of the macronucleus. 



Fig. 14 (Oc. 12). — From guinea-pig's blood, thirty-ninth day, showing the 

 division of the micro- and macro-nuclei, and the line of division along the long 

 axis of the organism. 



Fig. 15 (Oc. 12). — From same specimen as Figs. 12 and 13, showing com- 

 plete separation of micro- and macro-nuclei, with the line of division very well 

 marked. 



Fig. 1G (Oc. 12). — From another rat's blood, seventh day, showing two 

 complete organisms just at point of complete separation. 



Fig. 17 (Oc. 12).— From mouse's blood, sixth day, showing division of the 

 large iiyaline form, in which tiie different structures are more clearly seen. 



Fig. 18 (Oc. 12). — From rat's blood, fourth day, showing the conjugation 

 of two adult organisms, with the microuuclei at some distance apart. 



Fig. 19 (Oc. 12). — From spleenless dog's blood, ninth day, showing con- 

 jugation with the niicronuclei closely approximated. 



Fig. 20 (Oc. 12). — From the same specimen, showing conjugation in which 

 one micronucleus is in the dumb-bell form which it has in the early stages of 

 longitudinal division of the organism, and the other is seen as a round dot. 



Fig. 21 (Oc. 12). — From blood of a spleenless cat, showing conjugation in 

 which one micronucleus is in the form of a rod, and the other in the form of 

 a dot. 



VOL. 45, PAUT 3.— NEW SERIES. I I 



