72 Descriptions of Preparations. 



1844^ pp. 32-34, pi. iv., figs. 11-17. ^or similar figures of 

 another marine Polyzoon, Acamarclm Avicularia Lmx. Bugula 

 Amcidaria, Busk. Brit. Mus. Cat. p. 45 ; see Bronn^'s Klassen 

 und Ordnungen des Tliierreichsj iii. 1, Taf. v., fig. 3, A.B.C.D. 



For figures of the Hippocrepiau fresh-water species, see Allman, 

 Fresh-water Polyzoa, pi. ii. et passim. 



For an account of the zoological characteristics of the class, and 

 especially of the marine subdivision of it, see Busk, ' Fossil 

 Polyzoa of the Crag,' Palaeontographical Society's Memoirs, 

 1 859, part 1 2 j and British Museum Catalogue of Marine 

 Polyzoa, 1852, where, at pp. 103—108, an account of the struc- 

 tures above mentioned under the names of ' vibracula' and 

 ' avicularia,' will be found. 



For the microscopic anatomy of the fresh-water Polyzoa, see 

 Nitsche, Reichert und Dubois Reymond's Archiv., 1868, 

 p. 465 ; and for that of the nerve-system especially, see 

 Taf. xiii. fig. 23. For similar observations, see Alpheus Hyatt, 

 Proceedings of Essex Institute, Salem, Mass., U. S. A., vol. iv. 

 No. v., 1 864-1 868. 



For remarks as to the homologies and affinities of the class to the 

 Brachiopoda, and also to other Molluscan classes, see Lister, 

 Phil. Trans. 1834, p. 385; Farre, Phil. Trans. T837, p. 417 ; 

 Hancock, Phil. Trans. 1857, p. 849; Allman, 1. c. pp. 43-55; 

 and Quarterly Journal of Microscopical Science, January, 1869, 

 p. 62; Hyatt, 1. c. vol. v. No. v., pp. 150-157 ; Fritz Miiller, 

 Reichert und Dubois Reymoud's Archiv. 1S60, p. 79, where 

 at Taf. i. fig. 2, a larval Brachiopod is represented with four 

 arms borne upon a retractile proboscis ending in an oval pro- 

 tuberance closely similar to the epistome of the Hippocrepian 

 Polyzoa. 



For the identification of the Polyzoa, as belonging to the sub- 

 kingdom Mollusca, see Audouin and Milne-Edwards, Ann. 

 Sci. Nat. tom. xv. 1828 ; Milne-Edwards, ibid. tom. vi., p. 16, 

 1836; Recherches Anatomiques, Physiologiques et Zoologiques 

 sur les Polypiers de France, 1841-1844, 8vo. 



For the literary history of the nomenclature of the class, see Busk, 

 Ann. Nat. Hist, x., 1852. 



