"Bacillus subtilis, Cohn, and Spirillum undula, Ehrenb." — The Encyclopedia Britannica, 1910
"Spore-formation in Vibrio-like (c) and Spirillum-like (a, b, d) Schizomycetes." — The Encyclopedia…
"Spirillum containing many spores (a), which are liberated at b by the breaking up of the parent cells."…