314 PROF. A. C. SEWARD AND MR. ,T. WALTON ON [vol. lxxix, 



to the late Dr. E. A. Newell Arber, who believed them to be 

 referable to Phyllotheca. Further examination led Nathorst to 

 adopt this view : he did not commit himself to a specific deter- 

 mination, but compared them with Phyllotheca deliquescens 

 (Gkeppert) from Permian beds in Russia. Dr. Halle's more recent 

 discoveries confirmed Nathorst's conclusions. 



Description of the Fossils collected by Dr. H. A. Baker. 

 I. Devonian Plants. 



Dr. Baker's collection includes a few indeterminable impressions 

 on sandstone rocks from Port Philomel (Halfway Cove) on the 

 western coast of West Falkland, the locality from which Dr. Halle 

 obtained some imperfectly preserved fossils described by him as 

 ' Lepidodendroid fragments ', etc. The strata at Halfway Cove 

 underlie marine fossiliferous beds considered to be equivalent in 

 age to the Bokkeveld Series of South Africa. The plant-remains 

 are carbonaceous impressions of stems, the largest of which has a 

 diameter of 1 cm., and shows portions of lateral branches. No 

 surface-features are visible, and identification is impossible. It is 

 not improbable that the fossils are fragments of some Lepidoden- 

 droid plant similar to the better examples discovered by Halle and 

 to those shown in figs. 1 & 2 (PI. XIX). 



Lepidodendroid stems. — On the north side of Port Purvis, 

 West Falkland, a few traces of Lepidodendroid plants were col- 

 lected from shale at a higher horizon in the pre-Gondwana Series. 

 The specimens shown in figs. 1 & 2 (PL XIX) appear to belong to 

 partly-decorticated stems bearing spirally-disposed leaf -scars : no 

 surface-pattern can be detected. Doth reproductions are about 

 1-1- natural size. The depressions are more or less circular, and 



have the form of obliquety sloping 



Fig. 1. — A portion of the areas; the upper edge is more abrupt 



Lepidodendroid stem re- than the lower portion of the sloping 



produced in PL XIX, floor of the depression, which merges 



Jig. 2, enlarged three gradually into the general level of 



times to show the leaf- the stem. Some of the depressions 



scars. are filled with a circular patch of 



c carbonaceous matter as in scar o, 



■ ■;•■&&;■•■ , text-fig. 1 : in sear a the filling 



^rate. material is more reniform, and a 



% " S6 1 • ;^n^ median hump or ridge is seen on the 



v .1 ''^^§P||'-; lower margin. In sear c the filling 



^ ^ material is absent, and the central 



"~" '. : l|^p i "•' :'vv--." ' part of the depression is in part 



occupied by a projecting, blunt ridge. 



b The specimen shown in fig. 1 (PI. 



XIX) has a maximum diameter of 



33 cm. ; the scars are crowded, and this produces the effect 



of both a horizontal and a steep spiral arrangement. In some 



of the scars there is a median ridge as in scar c, text-fig. 1. It 



