1883.] Zoology. 551 
turbance of equilibrium of living and dead organisms, ferrugin- 
ous springs, poisons, lightning, &c.; 11. Marine life surviving in 
sh-water lakes.— Journal of the Royal Microscopical Society. 
Tae Cause or “ Ror” ın SHeep.—The transformation of the 
parasite worm, or liver-fluke, which causes “rot” in sheep, after 
they 
Th Possessed larval forms infesting various species of mollusks. 
ese 
= and remain there quiescent, only reaching maturity if swal- 
_ Y€ttebrate host. goo 
S Trematode with alternation of generations; but there is a good 
of variety in the life histories of the different species. It was 
? Times, 4th October, 1882. 
