A tuft of flagella present at one or both ends of bacterial cell is known as:

Arrangement/Types (i) Monotrichous—Single polar flagellum at one end. e.g. Vibrio cholerae. (ii) Amphitrichous—Single flagellum at both the ends. e.g. Alcaligenes faecalis. (iii) Lophotrichous—Tuft of flagella at one or both ends. e.g. Spirilla. (iv) Peritrichous—Flagella arranged all round the cell. e.g. Salmonella typhi.