MARCHANTITES. 5 1 



which the determination is based is too fragmentary to admit of 

 accurate identification. 



A more recently described Jurassic Liverwort, Paleohepatica 

 Rostafimkii, 1 from the neighbourhood of Cracow, differs from the 

 English species in the broader divisions of the thallus and in its 

 generally larger form. 



PL XIX. Fig. 2. 



V. 3652. A repeatedly forked specimen, with the habit of 

 a dichotomously branched thallose Liverwort, similar to Marchantia 

 and other genera. The impression on the sandstone is not veiy 

 clearly preserved, but there is a distinct indication of a thicker 

 median portion or broad midrib in each branch of the thallus, 

 and a thinner lateral margin, which appears as a light-brown 

 stain on the surface of the rock. Gristhorpe Bay. 



Presented by I>r. MK rraij. 



V. 2526. This specimen is labelled in Bean's writing Fucoides 

 arcuatus. The lobes of the thallus have a breadth of 3 mm., 

 the midrib being 1 mm. wide. The specimen figured by Lindley 

 and Hutton as Fucoides arcuatw has precisely the same habit 

 of branching, but the drawing suggests a stiffer and less delicate 

 plant. In all probability, however, F. arcuatus is merely an 

 imperfect example of Marchantites erectus. 



39.328. Examples with narrower thalloid branches. On the 

 same piece of shale there is an unusually good specimen of 

 Taniopteris major, L. & H. ; also fragments of Nilssonia compta 

 (Phill.), Tceniopteris vittata, Brongn., etc. Upper Shale: Gristhorpe. 



Sean Coll. 



39.329. Several fragments with narrow branches ; labelled by 

 Bean Fucoides erectus. The present form of the impressions is 

 probably, to a large extent, due to the partial destruction of the 

 delicate lateral portions of the thallus. Upper Shale : Scarborough. 



Bean Coll. 



40,571. An imperfect specimen, labelled Sph&rococcites arcuatus 

 and Fucoides erectus. Gristhorpe Bay. Bean Coll. 



1 Eaciborski (94), p. 10, pi. vii. figa. 1-3. 



