Page:The Zoologist, 4th series, vol 4 (1900).djvu/332

302 cone at the point from which the thread issues, and here slightly dimpling the surface of the water." It appears, from an observation by Gray on Elysia, that the suspensory thread can be subsequently ascended by the animal.

Thompson states that three Sea-Slugs believed to pertain to Polycera quadrilineata, kept in a phial of sea-water, were generally seen suspended by their threads from the surface, the body at the same time moving freely about with much grace. Polycera lessonii, Alder and Hancock mention, may be seen, in captivity, for hours together, "suspended by a film of raucous matter from the surface of the water."

Chromodoris amabilis (Ceylon), according to Kelaart, sometimes creeps at the surface, and "when touched with a feather it adheres by its foot, and can be kept dangling in this position by the aid of the mucous thread secreted by the surface of the foot."

Mr. Sinel mentions having frequently observed Eolis hanging by a thread from the water-surface, the suspended animal having the body doubled up, Hedgehog-like, with the back downwards. The writer learns from Mr. Hornell that the animal thus referred to by his colleague is Facelina coronata. The thread, Mr. Hornell states, is sometimes 4-5 in. in length.

Elysia viridis, from Swanage Bay, kept by Gray in a vase, usually rested, attached by the tail to the glass, with the body