440 C. CLIFFORD DOBELL. 



Avbicli were in my preparations. Their structure was as. 

 distinct as that of much larger forms. 



Two other organisms are shown in tigs. 77 and 78. In the 

 form shown in iig. 77, there is apparently a large nnclenr 

 mass occupying most of the luiddle region of the cell. I 

 fonnd several organisms like this one. They were all equally 

 distinct, and appeared normal. But it is possible they are 

 really plasmolysed forms of one of the other varieties. I 

 cannot be absolutely certain that they are not, as I have not 

 sufficient material for comparison. Fig. 78 is drawn from an 

 organism which has its nucleus in the form of a slightly bent 

 rod. I found a fair number of individuals of this form. It 

 appears to be a large form similar to the Lacerta organisms 

 shown in fig. 53. It is also somewhat similar to the forms 

 shown in fig. 63. 



I believe that a number of very small Bacteria which occur 

 in frogs, toads, and lizards have the same structure as these 

 small Bacteria which I have just described. But I have, up 

 to the present, been unable to convince myself that this is so. 

 With very small Bacilli it is usually very diflicnlt to be 

 absolutely certain of the exact structure. Only in very 

 favourable cases, when staining has been exactly right — as 

 in these minute forms from Mabuia — can satisfactory results 

 be attained. 



(4) Bacilli of the spirogyra type from Bufo 

 melanostictus. — In the large intestine of this toad — taken 

 near Colombo— I found several Bacilli which showed the 

 spirogyra type of nuclear structure. I have given figures 

 of two different forms which I encountered (see PI. 17, figs. 

 61, 62). 



The larger forms (fig. 62) were usually of the shape of 

 a bent rod. They attained a length of 10 /t. In these 

 organisms the nuclear filament was usually linear rather than 

 twisted — like the straight form of filament in B. spirogyra. 

 It may be described as a slender thread with here and there 

 large knot-like swellings on it (fig. 62). I did not see any 

 individuals with definite spiral or zig-zag filaments. 



