of Goal- Measure Plants. 139 



ironstone of the Coal-Measures near Dudley. The blocks from 

 which the sections were prepared never came into Binney's 

 possession ; indeed, he refers to them as having been lost, and 

 the account of the external characters is based on Mr Dawes' 

 description. 



For convenience of reference the sections have been re- 

 numbered 1 — 4; the following list shows the correspondence 

 between Binney's numbers and those adopted in the notes, also 

 between Binney's figures and those accompanying the present 

 descriptions. 



( Text-figure 1 p . , . {^TZ^ll * 



\ T-.1 /> o Bmney s specimens r\. vn., fig. o 



Slide 1. ] P . in., % 3 = No ft, I No 18 Bi (72 ^ p h 



(PL iv., figs. 8 & 12 { xiii., figs. 1 & 5 



I Text-figures 2 & 3 D . , . ( Binney (72) 



1 -r.1 n e Binney s specimen \ -&, ji,; A o 



Slide 2. \ PL ni., fig. 5 = No 31 1 \ Ph XIIL ' figs " 2 ' 



( PI. iv., figs. 6&9 JNa 6V ( 3, 4&6 



( Text-figure 4 Bhmev's snecimen ( Binne ^ < 72 > 



Slide 3. \ PL I"-, figs- 1 & 2 = ™ e 3 y 4 s specimen \ PI. xv., figs. 1 

 (PI. iv., figs. 7 & 10 a °* ( &4 



SUde4. (Text-figure 5 Binnev's snecimen ( Binne y ( 72 ) 



(cut from the J PL m fi„ 4 = ™ e |/ S P eCimen J pi. xv . ; fi gs . 2 



same stem as 1 » = JNo. o4 i p o 



Slide 1.) ( PI. IV., fig. 11 ( & 3 



Before describing in detail Binney's specimens, it is desirable 

 to briefly consider the history and morphological characteristics of 

 the two species Lepidodendron Harcourtii and Halonia regularis, 

 so far as they concern the questions raised in the following pages. 



The name Lepidodendron Harcourtii was proposed by Witham 

 in 1832 2 for a small Lepidodendroid stem obtained from Hesley 

 Heath near Rothbury in Northumberland, and presented by the 

 Rev. C. G. V. Vernon Harcourt to Mr (afterwards Professor) 

 Phillips of York, who handed it to Witham for description. In 

 1833 Lindley and Hutton 3 published figures of the type-specimen, 

 and in 1837 and 1839 more accurate drawings appeared in two 

 papers by Adolphe Brongniart 4 . There has been no little confusion 

 in the writings of later authors as to the precise specific character- 

 istics of Witham's species ; Binney and other palaeobotanists 

 having included under the name Lepidodendron Harcourtii plants 

 which differ in certain particulars from the type-specimen de- 

 scribed by Witham. Williamson, in his earlier memoirs " On the 

 Organization of the Fossil Plants of the Coal-Measures," described 



1 These two specimens were prepared from different stems, and not from the 

 same stem, as Binney's numbering implies. 



2 Witham (32), (33). 



3 Lindley and Hutton (33), Pis. xcvm. and xcrx. 



4 Brongniart (37), Pis. xx. and xxi.; (39), Pis. xxx. and xxxi. 



