cone at the point from which the thread issues, and here slightly dimpling the surface of the water."[1] It appears, from an observation by Gray on Elysia, that the suspensory thread can be subsequently ascended by the animal.
Polyceridæ.
Thompson states that three Sea-Slugs believed to pertain to Polycera quadrilineata,[2] 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.[3] 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."
Dorididæ.
Chromodoris amabilis[4] (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."[5]
Eolididæ.
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.[6] The writer learns from Mr. Hornell that the animal thus referred to by his colleague is Facelina coronata.[7] The thread, Mr. Hornell states,[8] is sometimes 4-5 in. in length.
Elysiidæ.
Elysia viridis,[9] from Swanage Bay, kept by Gray in a vase, usually rested, attached by the tail to the glass, with the body
- ↑ Alder and Hancock, op. cit. p. 21.
- ↑ P. quadrilineata v. nonlineata.
- ↑ Thompson, 'Annals of Natural History,' v. (1840), p. 92.
- ↑ Doris amabilis.
- ↑ Kelaart, 'Annals and Magazine of Natural History' (3), iii. (1859), pp. 294–5.
- ↑ Sinel, 'Journal of Marine Zoology,' i. (1894), p. 32.
- ↑ Eolis coronata.
- ↑ Hornell, 'Journal of Marine Zoology,' ii. (1896), p. 59.
- ↑ Aplysiopterus viridis.
