Mr J. M. Macfarlane on Lcpidopliloios. 189 



tlie bed of the Water of Leith at Kate's Mills, and two in 

 tlie collection of the Geological Survey, being all that I 

 know of. When dichotomy did occur, the angle formed 

 varies from 75° to 90°, and in many of my Hailes speci- 

 mens the medullary vascular zone is well preserved as a 

 thin chord traversing the middle of the twig. The twigs 

 vary from one-tenth to one-third of an inch in diameter. 

 The cone attains a maximum size of 4^ inches. I have 

 obtained, principally from the shale of Hailes quarry, a 

 very complete series of cones, differing in size and age. 

 In the young state they are not unlike Cardiocarpa, and 

 for such they have occasionally been mistaken. At this 

 stage only one row of cone-scales is visible. As growth 

 proceeds the extremities of other scales appear, and 

 these are added to, by elongation of the cone, till tlie 

 adult form is reached. The cone-scales or bracts, on the 

 inturned bases of which the sporangia are borne, are 

 lanceolate, and traversed by a single median rib (Plate 

 VIII. fig 2.). 



Lepidophloios laricinum is found throughout the whole of 

 the Calciferous series, and apparently less sparingly in the 

 Carboniferous Limestone series round Edinburgh. Mr 

 John Henderson of the Geological Society has shown me 

 a Halonia from beds on the east side of Kinghorn identical 

 with that of the Calciferous series, while ]\Ir H. M. Cadell 

 has furnished me with cone-twigs obtained by him from 

 "a whitish argillaceous bed, about 9 inches in thickness,"* 

 in the Borrowstounness coalfield. It is the only species 

 occurring in the Calciferous series itself as far as my ob- 

 servations go. A totally distinct species is found in the 

 Upper Coal-Measures which seems exactly to resemble 

 Bunbury's L. tumidus. 



I would here express indebtedness to my kind friend, 

 ]\[r C. W. Peach, for permitting me to examine some of 

 the specimens in liis rich collection. The plates have 

 been drawn and lithographed by my fellow-worker, Mr R. 

 Kidston, whose careful and beautiful work in art is but a 

 counterpart of the qualities he displays in the pursuit uf 

 science. 



* Trans. Geol. Soc. Edin. 1880, p. 306. 



