ANIMALS. 35 



suggested to him the propriety of estabUshing a new genus for some of the reticulated 

 Corals allied to Betepora; and on mentioning this to Mr. Lonsdale, he, at once, adopted 

 the suggestion, and named a species Fenestella Milleri^ in his notice on Fossil Corals, 

 appended to Sir Roderick L Murchison's ' Silurian System.' Since then, Mr. Lonsdale 

 has most successfully worked out the genus in Darwin's work already referred to, and 

 in the " Appendix A" of the great work on * Russia and the Ural Mountains,' by Sir 

 Roderick L Murchison, Count Keyserling, and M. E. de Verneuil. 



Believing that the genus Fenestella, as constructed by Mr. Lonsdale, requires 

 subdividing, it is suggested, that the diagnosis just given be modified as regard the 

 arrangement of the cellules, and the character of the connecting bars. I would 

 therefore propose the following alteration. 



A ramose, cellular, calcareous polypidom : cellules longitudinally distributed on 

 one side of the branches, in two or more linear series, the series separated from each 

 other by a dividing ridge : stems or ribs connected by transverse non-celluliferous 

 processes ; forming generally expansions or funnel-shaped bodies, &c. &c. 



By adopting this alteration we keep together a large number of Palaeozoic Corals 

 having a well-defined character, such as Fenestella antiqua, Lonsd., F. crassa, M'Coy, 

 and F. flahellata, Phill., and divested of the species constituting M'Coy's Folypora and 

 Ftylopora, and those forming the two succeeding genera ; at the same time Fenestella 

 antiqua is still retained as the type of the genus. 



Fenestella retiformis, ScJdotheim. PI. II, figs. 8, 8^, 9, 10, 11, 12, 13, 14, 15, 

 16, 17, 18, 19. 



KoRALLOPHiTEN, Kekatophyten, &c., ScM. Tasclienbuch, pp. 55, 59, 1813. 

 (?) Reticulated Marine Production resembling the Genus Flustra, Winch. Trans, 



Geol. Soc. Lond. 1st series, vol. iv, p. 10. 1817. 



Keratophytes retiformis, Schl. Akad. Miinch., vol. vi, pp. 17-20, pi. i, figs. 1, 2, 1820. 



EscHARiTES — „ Petrefact. pp. 342-3, 1820. 



(?) Reticulated Marine Production, Winch. Conybeare and Phillips, p. 305, 1822. 



EscHARiTES RETIFORMIS, ScM. Bou6, Edin. Phil. Journ. vol. xii, p. 144, 1825. 



(?) CfjRALLOID RESEMBLING GORGONIA FLABELLUM, 1?0^^. Nat. Hist. Stockton, p. 78, 1827. 



GoRGONiA INFUNDIBULIFORMIS, Goldfuss. Petrefacta, p. 20, pi. x, fig. la ; and pp. 98, 99, 



pi. xxxvi, fig. 2 b, c, 1828. (?) 

 — ANTiauA, Goldfuss. Op. cit., p. 99, pi. xxxvi, fig. 3 b, 1828. (?) 

 Retepora flustracea, Phillips. Trans. Geol. Soc. Lond. 2d series, vol. iii, p. 12r 



pi. xii, fig. 8, 1829. 

 — — „ De la Beche, Geol. Man. p. 385, 1831 ; Op. cit., 



Germ. Trans, p. 459, 1832; and 3d English 

 Edition, p. 572, 1833. 



1 Palaeozoic Fossils, p. 22. 



