242, C. CLIFFORD DOBELL. 
EXPLANATION OF PLATES 2—5, 
Tlustratmg Mr. C. Clifford Dobells paper on “ Researches 
on the Intestinal Protozoa of Frogs and Toads.” 
PLATE 2. 
(Figs. 11 and 12 are drawn from living animals. The remainder are 
from permanent preparations. Fixation: hot sublimate-alcohol 
(Schaudinn). Stain: Heidenhain’s iron-hematoxylin. Figs. 1, 2, 5, 7, 
8, 9 and 21 counterstained with Bordeaux red. All drawings made 
under Leitz 1; in. oil-immersion with ocular No. 5. | 
Figs. 1-15.—Trichomastix batrachorum. 
Fig. 1.— Ordinary vegetative individual, showing general structure. 
Fig. 2.—Form with thick axostyle. The attachment of the blepharo- 
plast to the bent axostyle is very clearly seen. 
Fig. 3.—Form with very slender axostyle. 
Figs. 4-12.—Stages in division. 
Fig. 4.—First stage in division. The axostyle has disappeared, 
there is no nuclear membrane, and the blepharoplast is beginning to 
divide. 
Fig. 5.—The blepharoplast is now elongated, forming a rod with two 
flagella at either end. 
Fig. 6.—The chromatin is arranged in a spindle-shaped mass of 
small granules, and new flagella have made their appearance. (The 
young flagella are by no means always so well developed as in this 
instance.) 
Fig. 7.—The chromatin is now arranged in large lumps, and the 
outgrowth of new flagella is very clearly seen. 
Fig. 8.—At this stage the chromatin has travelled in two irregular 
masses towards the blepharoplasts. 
Fig. 9.—A similar stage to the preceding. The rod connecting the 
daughter-blepharoplasts is very distinctly seen. 
Fig. 10.—The large lumps of chromatin have broken up to form the 
new nuclei of the daughter-monads. A thick rod lies between the two 
nuclei. 
Fig. 11.—A somewhat later stage. 
