596 C. CLIFFORD DOBELL. 
Figs. 17, 18, 19.—Degenerate forms. 
Figs. 20—29. Bacterium lunula, n.sp. 
Fig. 20.—Ordinary individual before sporulation. 
Fig. 21.—Individual dividing into two, preparatory to forming 
spores. 
Figs. 22, 23, 25, 26.—Successive stages in the development of a 
disporic (double) individual. 
Fig. 24.—An individual, almost divided into two—each half con- 
taining a spore-rudiment. 
Figs. 27, 28, 29.—Stages in development of a spore in a monosporic¢ 
individual. 
Figs. 30—32. Bacillus flexilis. 
Fig. 30.—An abnormal individual, which—at a late stage in spore- 
formation—is almost completely divided into two. 
Figs. 31, 32 —Stages in development of (small) abnormal monosporie 
individuals. 
