Note 60 — Chapter XI

Since the above was in type, I have on several occasions observed vertical coils in constricting snakes. Twice a python constricted an animal in distinct vertical coils. I drew the attention of Keeper Tyrrell to this, and we were both convinced that no lateral coils whatever were used. On another occasion, while Mr. Elwes was studying the action of Elaphis quater-radiatus for the illustration, p. 205, its coils were entirely vertical, not lateral.