ANIMALS. 35 
suggested to him the propriety of establishing a new genus for some of the reticulated 
Corals allied to Retepora ; 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 I. 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 I. 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 Paleozoic Corals 
having a well-defined character, such as Menestella antigua, Lonsd., FP. crassa, M‘Coy, 
and F. flabellata, Phill., and divested of the species constituting M‘Coy’s Polypora and 
Ptylopora, and those forming the two succeeding genera; at the same time Fenestella 
antiqua is still retained as the type of the genus. 
FENESTELLA RETIFORMIS, Schlothemm. Pl. Il, figs. 8, 8a, 9, 10, 11, 12, 13, 14, 15, 
16, 17, 18, 19. 
KoRALLOPHITEN, KERatopnHytEN, &c., Schl. Taschenbuch, pp. 55, 59, 1813. 
(2?) RericuLateD MartINE PRopUCTION RESEMBLING THE Gunus FLustRa, Winch. Trans. 
Geol. Soc. Lond. Ist series, vol. iv, p. 10. 1817. 
KERATOPHYTES RETIFORMIS, Schl. Akad. Miinch., vol. vi, pp. 17-20, pl. i, figs. 1, 2, 1820. 
EscHARITES — »  Petrefact. pp. 342-3, 1820. 
(?) RettcuLatep Marine Propuction, Winch. Conybeare and Phillips, p. 305, 1822. 
EscHarites rEtIrormMis, Schl. Boué, Edin. Phil. Journ. vol. xii, p. 144, 1825. 
(2) CoRALLOID RESEMBLING GoRGONIA FLABELLUM, Hogg. Nat. Hist. Stockton, p. 78, 1827. 
GORGONIA INFUNDIBULIFORMIS, Goldfuss. Petrefacta, p. 20, pl. x, fig. 1a; and pp. 98, 99, 
pl. xxxvi, fig. 2 6, c, 1828. (?) 
— ANTIQUA, Goldfuss. Op. cit., p. 99, pl. xxxvi, fig. 3 6, 1828. (2) 
RETEPORA FLUSTRACEA, Phillips. Trans. Geol. Soc. Lond. 2d series, vol. iii, p. 129, 
pl. xii, fig. 8, 1829. 
aay — 5 De la Beche, Geol. Man. p. 385, 1831; Op. cit., 
Germ. Trans. p. 459, 1832; and 3d English 
Edition, p. 572, 1833. 
1 Paleeozoic Fossils, p. 22. 
