MARCHAXTITES. 49 



Group BEYOPHYTA (MUSCINEJB). 

 Class HEPATKLE. 



The vegetative plant-body possesses a different organization on 

 the ventral and dorsal sides ; it has the form of a thalloid creeping 

 plant (thalloid Liverworts), or of a delicate stem with thin 

 appendages or leaves without a midrib (foliose Liverworts). 



Order MARCHANTIE^E. 



Genus MARCHANTITES, Brongniart. 

 [Tableau v6g. foss. p. 12, 1849.] 



Vegetative body of laminar form, with apparently dichotomous 

 branches, agreeing in habit with the recent thalloid Hepaticae. 

 as represented by such a genus as Marchantia. 



Marchantites erectus (Leek., ex Bean MS.). 



[Leckenby, Quart. Journ. Geol. Soc. vol. xx. p. 76, 1864.] 

 (PI. XIX. Fig. 2; Text-fig. 2.) 



1837. Fucoides arcuatus, Lindley & Hutton, Foss. Flor. vol. iii. pi. 185. 



1838. Sphcerococcites arcuatus, Sternberg, Flor. Vorwelt, vii. p. 104. 

 1850. Sphterococcites arcuatus, Unger, Gen. spec, plant, foss. p. 26. 



1864. Fucoides arcuatus, Leckenby, Quart. Journ. Geol Soc. vol. xx. p. 7C. 

 1864. Fucoides erectus, ibid. p. 81, pi. xi. figs. 3, b. 

 1869. Haliseris erecta, Schimper, Pal. Veg. vol. i. p. 185. 

 1875. Fucoides arcuatus, Phillips, Geol. Yorks. p. 195, Lign. 1. 

 ? Fucoides dijfisus, ibid. p. 106. Lign. 2. 

 Fucoides erectus, ibid. p. 196, Lign. 3. 

 1898. Marchantites erectus, Seward, Fossil Plants, vol. i. p. 233, fig. 49. 



Type-Kpecimen. "Woodwardian Museum, Cambridge (Leckenby 

 Collection, No. 1). Text-fig. 2. 



Thalloid body, divided into spreading, dichotomously branched 

 segments, obtusely pointed apically. The slightly wrinkled surface 



