26 STUDIES IN GEOLOGY, No. 4 



Lepidodendron simplex Lesquereux, Geol. Survey of Illinois, vol. 

 H, p. 454 pl. XLV, fig. 5, 1866. 



Lepidodendron King, Edinb. New Phil. Journ., vol. XXXVI, pl. V, 

 fig. 3- 



Lepidodendron dissitutn, Sauveur, Veget. Foss. Belgique, pl. UX, 

 fig. 3; pl. LXI, fig. 6, 1848. 



Lepidodendron elegans ? Sauveur, Veget. Foss. Belgique, pl. LIX, 

 fig. 4, 1848. 



Phytolithus (cancellatus) Martin, Petrificata Derbiensia, pl. XIII, 

 fig. 3, 1809. 



This well known species, of which I have cited a consid- 

 erable bibliography, is common at Paracas. There is con- 

 siderable variation in the closeness or remoteness of the long 

 narrow bolsters. Those in which these are well spaced often 

 show the characteristic longitudinally wrinkled epidermis. 



That the spacing is largely a matter of age is shown by 

 those specimens where the bolsters are closely spaced fre- 

 quently having the narrow, linear lanceolate leaves still 

 attached. 



Lepidodendron obovatum Brongniart 



PLATE I Fig. 5 



Lepidodendron obovatum Brongniart, Prodrome, p. 86, 1828. 

 Ettingshausen, Steinkfl. Radnitz, p. 54, 1854. 

 Fontaine & White, Permian Fl., p. 17, 1880. 

 Lesquereux, Geol. Pa., vol. 2, p. 874, 1858. 

 Lindley & Hutton, Foss. Fl., vol. I, pl. 19 bis, 1832. 

 Owen, Geol. Surv. Wis., p. 99, pl. 6, fig. 2, 1852. 

 Renault, Cours. Bot, foss., p. 13, pl. 6, fig. 5, 1882. 

 Roehl, Foss. Fl. Steink. Westph., p. 129, pl. 6, fig. i; pl. 8, 



fig. 8b; pl. 29, fig. 15, 1869. 

 Sternberg, Versuch., fasc. i, pp. 20, 23, pl. 6, fig. i ; pl. 8, fig. la, 



1820; fasc. 4, p. X, 1826. 

 Zeiller, Veget. foss. terr. houil., p. 108, 1880. 

 Kidston, Cat. Pal. PL, p. 149, 1886. 

 Fischer, in Potonie, Abbildungen und Beschreibungen foss. Pfl. 



Lief 3, 1905. 



Zeiller, Foss. Fl. bass. Heraclee, p. 73, pl. 6, fig. n. 

 Kidston, Trans. Roy. Soc., Edinb., vol. 50, pt. i, p. 134, 1914. 

 Sagenaria obovata Bronn, Index Palaeont., p. 1106, 1848. 

 Feistmantel, Vers. Bohm. Kohlenab., p. 204, pl. 38, figs. 1-4, 



1875. 



