44 PERMIAN FOSSILS. 



Genus Thamnisciis, King, 1849. 



Diagnosis. — '' The typical Tharaniscidia. Ste7ns frequently and irregularly bifur- 

 cating more or less on one plane : celluliferous on the side overlooking the imaginary 

 axis of the Coral. Celhdes imbricated and arranged in quincunx. GemmuUferous 

 vesicles overlying the cellule-apertures."i 



Type, Ceratophytes dubius, Schlotheim. 



I formerly placed the type of this genus in Lamouroux's Hornera ; but it is evident 

 from Mr. Lonsdale's observations that this was an erroneous collocation." At 

 the time my ' Catalogue' was published, I had not made up my mind how this 

 species, and the one following it, should be disposed of generically, though I felt 

 persuaded that they could not be included in any of the reticulated genera then 

 established. I was therefore induced to adopt provisionally the name which Schlotheim 

 had given to them^ under the erroneous impression, probably, that they were of a horny 

 and flexible nature, and consequently true Ceratopliytes as contradistinguished from the 

 Lithopliytes or calcareous Corals. 



The principal distinctive characters of Thamnisciis, compared with other allied 

 genera, consist in the frequent and irregular terminal bifurcation of the stems, and in 

 the gemmuliferoiis vesicles overlying the cellule-apertures. 



Probably the Fenestella intertexta of Captain Portlock,^ is a congeneric species. 



Thamniscus dubius, ScJdotheim. Plate V, figs. 7, 8, 9, 10, 11, 12. 



Encrinites ramosus, in pars, Schl. Munch. Akad., vol. vi, pp. 20-24, pi. ii, fig. 4 ; 



pi. iv, figs. 16, 17, 1820. 

 Keratophytes dubius, Schl. Petrefacten, p. 341, 1820. 

 Ceratophytes — „ Boue, Edin. Phil. Journ., vol. xii, p. 144, 1825. 



GoRGONiA DUBiA „ Goldfuss, Pctrcf., pp. 18, 19, pi. vii, fig. 1 «, I, c, 1826. 



Unknown Coralline Body, Sedgwick. Trans. Geol. Soc. Lond., 2d series, vol. iii, pi. xii, 



fig. 5, 1829. 

 GoRGONiA DUBIA, Schl. Germ. Transl. Geol. Man., p. 459, 1832. 



— — ,, Quenstedt, Wiegmann's Archiv, p. 91, 1835. 



— ANCEFS ET G. DUBIA, ScM. Morris, Catalogue, p. 38, 1843. 



— DUBIA, „ Geinitz, Gsea von Sachsen, p. 98, 1843. 

 Fenestella (Hornera ?) ramosa. King. Bull. Soc. Geol. Fr., 2""^ serie, vol. i, p. 23, 



1844. 

 — (?) DUBIA, Schl. Idem, p. 24. 

 _ (?) _ ,, Geol. Russ., vol. i, p. 221, 1845. 



1 Annals and Magazine of Natural History, 2d series, vol. iii, p. 389. 



"- Geology of Russia and the Ural Mountains, vol. i. Appendix A, p. 62S. 



2 Report on the Geology of Londonderry, &c., p. 324, pi. xxii A, fig. 3 a, h, c. 



