IN the late Mr. Darwin's interesting contribution upon this subject (NATURE, vol. xxv. p. 529), mention is made of the fact that the newts in Mr. Norgate's aquarium “frequently have one foot caught by a small freshwater bivalve (Cyclas cornea?).” It is, perhaps, worth calling your readers' attention to a passage which occurs in Mr. Knapp's “Journal of a Naturalist” (2nd ed., p. 316), published in 1829, wherein, speaking of the newt, he says: “I have seen the boys in the spring of the year draw it up by their fishing lines, a very extraordinary figure, having a small shell-fish (Tellina cornea) attached to one or all of its feet; the toes of the newt having been accidentally introduced into the gaping shell, in its progress on the mud at the bottom of the pool, or decidedly put in for the purpose of seizure, when the animal inhabitant closed the valves and entrapped the toes....”