FLORA OF THE CARBONIFEROUS EPOCH. 55 



(5.) Lepidostrobus (Plean, Stirlingshire, Mr. Mackenzie). 

 About i an inch in diameter. Secondary spirals 9 S, 1 5 D, 

 24 S, 39 D. Divergence = gi^ (Trijngate arrangement). 



(6.) Knorria taxina (from collection of Dr. Eankin, Carluke). 

 Somewhat compressed, 2-2^ inches'^ in diameter. Second- 

 ary spirals 15 D, 24 S. Divergence - j^^ (Trijugate ar- 

 rangement). 



(7.) Lejjidodendron (from Dr. Eankin's collection). About 1^^ 

 inch in diameter. Secondary spirals 10 D, 15 S, 25 D, 40 

 S. Divergence = -^. (Quinquejugate arrangement). 



(8.) Lepidodendron (Dowanhill, Glasgow, Fossil Sandstone 

 series). Trunk about 1 foot long, and 1 foot in diameter. 

 The upper portion exhibits secondary spirals 35 D, 56 S, 

 91 D; thus indicating a 7 -jugate arrangement, with diver- 

 gence - .:j-^. The arrangement on the middle and lower 

 portion is indistinct and confused ; so much so as to render 

 any determination of the arrangement doubtful. 

 ±5. beries, g^, -j-, -fj yt' ^^^' 



(9.) Lepidodendron (Messrs Merry and Cunningham's Clayband 

 Iron-Pit, Carluke). Stem 2 inches in diameter. Second- 

 ary spirals 18 S, 29 D, 47 S. Divergence = -fi- 

 Kj. beries, -^, g-, -g-, y^, etc. 



(10.) Lepidodendron (R. B. Garden, Edinburgh, Museum). 

 Stem somewhat flattened, 1-1 -| inch in diameter. Second- 

 ary spirals 9 D, 14 S, 23 D, 37 S. Divergence - if . 



(11.) Lepidodendron (Redhaugh, near Edinburgh, Mr. Peach). 

 Stem somewhat flattened, f to ^ inch in diameter. 

 Secondary spirals 9 S, 14 D, 23 S, 37 D. Divergence = 



1 .3 

 60* 



D Spripc; 1 i _2_ _3_ _5_ pff. 

 (12.) Knorria taxina (Stockbriggs, Lesmahagow, — Hunterian 

 Museum). About 1 inch in diameter. The specimen con- 

 sists of a main stem and one of the branches into which it 

 has forked. On the main stem the secondary spirals are 

 6 D, 11 S, 17 D. Divergence = 2V (series, i I, yV? _^^ 

 -/g-, etc.) — On the branch the secondary spirals are 8 S, 

 1 3 D. Divergence = 2^ (ordinary series, i, -|-, f , f , etc.) 



'^ By inadvertence, the diameter is stated in my Class-book as 

 4-5 inches. 



