258 FOSSIL PLANTS. 



Dawson, Foss. Plants Lower Garb. Canada, p. 37. 



Geinitz, Gaea v. Sachsen, p. 83. 



Stur, Jahrb. d. k. k. Geol. Eeichsanst. vol. xii. p. 140. 



Alethopteris Pluckenetii. 



Feistmantel, Jahrb. d. k. k. Geol. Reichsanst. vol. xxii. pp. 295 and 298. 

 Steinkohl. u. Perm.-Ablager. p. 87. 



Zeitsch. d. Deut. Geol. Gesell. vol. xxv. p. 598. 



Geinitz, Neues Jahrbuch, 1867, p. 284. 



Weiss, Verhandl. d. Natur. Vereines d. Preuss. Eheinl. u. Westph. 1868, 

 p. 82. 



Aspidites Pluclceneti. 



Geinitz, Neues Jahrbuch, 1867, p. 278. 



Gomes, Flora Foss. do Terr. Carbon, do Porto, Serra do Bussaco, p. 22. 



Diplothmema Pluckenetii. 



Stur, Culm Flora, heft ii. p. 230. 



Pecopteris bifurcata. 



Schimper, Trait6 d. Pale"ont. Ve'ge't. vol. i. p. 531, 



Sphenopteris bifurcata. 



Ettingshausen, Steinkf. v. Eadnitz, p. 39. 



Aspidit 

 Goppert, Syst. Fil. Foss. p. 359. 



Remarks. The fructification of this fern has been described by Sterzel, 

 who has proposed for this species the new genus Dicksaniites. The fruit is 

 not very well preserved, but in a sufficiently good state to show that its form 

 is altogether new to Fossil Botany, and of a nature that affords characters for 

 generic distinction. 



CALLIPTERIDIUM, Weiss, 1870. 

 Zeitschrift der Deut. Geol. Gesellschaft. vol. xxii. p. 858. 



Callipteridium ovatum, Brongniarfc, sp. 



Callipteridiu 



Eenault, Cours de Botan. Foss. 1883, p. 155. 



Pecopteris ovata, Brongniart (ante, p. 127). 



Alethopteris ovata. 

 Andrae, Jahrb. d. Naturwis. Vereines, Halle, 1850, p. 127. 



Callipteris mirabilis. 

 Weiss, Verhandl. d. Natur. Vereines d. Preuss. Eheinl. u. Westph. 1868, 



Remarks. This plant, which holds a somewhat anomalous position, 

 possesses in part the characters of Neuropteris and Pecopteris. though from 

 the former genus it is clearly separated by the pinnules being morl or less 

 united among themselves and attached to the rachis by the whole of their 

 base. It has also close affinities to the genus Callipteris. It was included in 

 Pecopterus (ante, p. 127), but further investigations have led me to adopt 

 for it the genus Callipteridium, Weiss. This genus is placed by some authors 

 mNeuroptendea;, but from the pinnules being attached to the rachis by the 

 whole of their base, I am more inclined to retain it in Pecopteridece. 



