170 THE MICROSCOPE AND ITS REVELATIONS. 



formed by a semicircular membranous lamina folded upon itself. It is 

 surmised by Prof. Allman, with much probability, that this curious 

 appendage is * nidamental/ having reference to the development and 

 protection of the young; but on this point further observations are 

 much needed; and any Microscopist, who may meet with Appendicularia 

 furnished with its ' house,' should do all he can to determine its struc- 

 ture and its relations to the body of the animal. ' 



1 For details in respect to the structure of Appendicularia, see Huxley, in 

 "Philos. Transact. "for 1851, and in "Quart. Journ. of Microsc. Science," Vol. 

 iv. (1856), p. 181; also Allman in the same Journal, Vol. vii. (1859), p. 86; Gegen- 

 baur in Siebold and Kolliker's "Zeitschrift," Bd. vi. (1855), p. 406; Leuckart's 

 " Zoologische Untersuchungen," Heft ii., 1854; and Fol's Etudes sur les Appen- 

 diculaires' in " Archiv. Zool. Experim.," Tom. i. (1872), p. 57. For the Tunicata 

 generally, see Prof. T. Rupert Jones, in Vol. iv. of the " Cyclop, of Anatomy and 

 Physiology;" Mr. Alder's 'Observations on the British Tunicata,' in "Ann. of 

 Xat. Hist.," Ser. 4, Vol. xi. (1863), p. 153; and Mr. Hancock's Memoir 'On the 

 Anatomy and Physiology of the Tunicata,' in the "Journal of the Linngean 

 Society," Vol. ix., p. 309. 



