246 MR. HAMSHAAV THOMAS OX THE EOSSir. FLORA OF [June 1913, 



The latter are confined to the lower side, and are arranged in two 

 somewhat narrow rows, one on each side of the midrib. They are 

 rather small, and were apparently sunk in the epidermis. The 

 guard-cells have often disappeared, hut are occasionally seen as 

 two colourless cells on each side of the central slit. They are 

 surrounded by five or six subsidiary cells, which also seem to be 

 somewhat below the general level of the surface of the epidermis. 



Elatides setosa (Phill.). 



[•' Illustr. Geol. Yorks. pt. 1— The Yorkshire Coast ' 3rd ed. (1875) p. 229.] 



The specimens of Elatides (Pagiophylltmi) in the collections of 

 Mr. Lane and Mr. Saunders are rather fragmentary, but more- 

 complete examples of leafy shoots have been found at Roseberry 

 Topping. These seem to differ somewhat from the type of Pagio- 

 phyllvm williamsoni common at Grristhorpe. The main twigs had 

 lateral branches given off at frequent intervals, on which small 

 leaves were borne in the usual spiral manner. The leaves .were 

 3 to 4 mm. long, and, when seen in side-view, are falcately curved ; 

 but in surface-view they appear bluntly pointed. They were much 

 thinner than in P. williamsoni, and were flattened instead of pre- 

 senting a rhomboidal section. Leaves are abundant on the younger 

 stems, but on the older stems they are rather far apart. A femala 

 cone is seen in one specimen, lying with some twigs with which 

 it was doubtless connected ; but part of the rock is broken away, 

 and the basal portion of the cone is not seen. The cone is about 

 1 cm. broad, appears to have been cylindrical, has a bluntly 

 rounded apex, and was composed of numerous crowded scales : 

 little can be made out concerning the details of structure of these 

 scales. The cone, as well as the leaves, differs from that of 

 P. williamsoni. In the latter it is much larger and more oval, 

 and the apices of the scales often show a characteristic falcate form. 

 The specimen here described might be regarded as a younger form, 

 but in some instances depressions are seen which might well have 

 been formed by the seeds. 



The differences in both the cone and the twigs probably warrant 

 the separation of the Marske specimens from P. williamsoni. They 

 are possibly referable, however, to Phillips's species E. (Brachy- 

 pliyllum) setosa, a type with slenderer leaves and branches. The 

 details of structure of this form are not well known nor have any 

 cones been discovered. The specimen figured by Phillips and the 

 drawings given by Prof. Seward do not exhibit any very charac- 

 teristic features ; but, from an examination of a specimen in the 

 Leckenby Collection, it appears to me that the Marske examples may 

 well be included in this type. In the examples here described, 

 however, the leaves are longer, slenderer, and more falcate than 

 in specimens previously known ; but it is doubtful whether these 

 differences would warrant the creation of a new species for them. 1 



1 [Many specimens of this type hare recently been found at Roseberry 

 Topping, bearing male and female cones. These seem to indicate the necessity 

 of creating a new species, and probably a new genus for the form here described.] 



