COXTKIBUTIOXS TO THE CYTOLOGY OF THE BACTERIA. 42^ 



isms only. Some of tliese organisms ai-e of large size, and it 

 is easy to determine their structure. Two individuals of long, 

 slender form are shown in figs. (34 and 65 (PI. 17). They 

 exhibit a pale, uniformly stained cytoplasm, with relatively 

 large chromatin granules distributed through it. The cyto- 

 plasm is generally free from chromatin granules at the extreme 

 ends of the organism. 



This foi'm divides like B. flexilis. It is slightly flexible, 

 and motile. I have not observed spore-formation. The 

 avei'age length is about 11 /«, the breadth a little less than 



1 //. ^ 



I have seen a good many forms which are intermediate in 

 size between these forms and the large flexilis forms 

 described above in the same host. I think it possible that 

 there may be some genetic connection between them, though 

 it does not appear very probable. 



(3) Bacilli of the flexilis type from Mabuia cari- 

 nata. — In the large intestine of a Ceylon lizard, Mabuia 

 carinata, I found an organism wliich is very similar to the 

 flexilis forms from European frogs, toads, and lizards. The 

 infected Mabuiae were taken in Colombo. 



This organism is shown in figs'. 21-23, PI. 16. It is motile, 

 flexible, disporic (see fig. 23), and divides by constriction. It 

 shows a nuclear apparatus exactly like that of B. flexilis. 

 I have not been able to obtain all the stages in spore-forma- 

 tion, so that I do not know whether it displays the same 

 remarkable phenomena during this process as are seen in B. 

 b ii t s c h 1 i i and B. flexilis. But such stages as I have found 

 are very like those of B. flexilis. The average length of 

 the organism is about 17 f.i — a good deal less than that of B. 

 flexilis or the flexilis forms from Lacerta muralis. 



As far as my observations go, the ordinary forms of these 

 organisms are therefore closely similar. There are differences 

 which distinguish these three forms (i.e. those from the frog 

 and toad [B. flexilis], from Lacerta, and from Mabuia) 

 from one another, but cytologically they are all three 

 essentially similar. 



