I have recently found a large species of this genus dwelling in the shell of the large Cladoceran Crustacean, Eurycercus lamellatus. It is remarkable for its power of completely telescoping its extremities within the middle segments, and for its immense foot-glands, both characters being doubtless correlated with its habitat. Rousselet identifies it with P. petromyzon.
Month. Micr. Journ. vol. ix. 1873, p. 287; Journ. Quekett Club, ser. 2, vol. ii. 1884-86, p. 231.
See Dr. Hudson's very suggestive presidential addresses to the Royal Microscopical Society, published in their Journal, vols. ix.-xi. 1889-91.
Euchlanis lynceus.—This is clearly not an Euchlanis, and of the six names referred to—Ploesoma, Gomphogaster, Gastropus, Gastroschiza, Bipalpus, and Dictyoderma—the first has priority, and the other five drop by the laws of zoological nomenclature.
Journ. Quekett Club, ser. 2, vol. v. 1892-94, p. 205.