RADSTOCK SERIES OE THE SOMERSET AND BRISTOL COAL FIELD. 355 



a fragment of a pinna is given, which, in addition to showing lanceolate pinnules, 

 exhibits the dichotomous ramification of the rachis. The pinnules situated 

 at the angles formed by the dichotomies are of very irregular shape, being 

 frequently triangular and irregular, sometimes even bifid at their apex, as if two 

 pinnules had become confluent. The most interesting specimen I figure is that 

 on PI. XXI. fig. 2. On this example (which lies on the corner of a very large 

 slab of Neur. macrophylla, which I received from Mr Steart, manager of the 

 Braysdown Colliery), the gradual transition in the form of the pinnules from 

 lanceolate to cyclopteroid can be followed. On some specimens in the col- 

 lection of Mr J. M'Murtrie, F.G.S., large cyclopteroid pinnules occur on a 

 thick rachis, which may be the main rachis of the frond. 



From Neur. Scheuchzeri, Hoffm., this species is easily distinguished by the 

 absence of the small cyclopteroid pinnules at the base of the large terminal 

 lobe, by its being destitute of the bristle-like hairs, and, above all, by its 

 nervation. In Neur. macrophylla the ultimate dichotomy of the veins is much 

 closer to the margin of the pinnule than the corresponding dichotomy in Neur. 

 Scheuchzeri, and in the latter species the veins are closer. 



From the figure of Neur. Scheuchzeri given by Zeiller (loc. cit., pi. xli. fig. 1), 

 it appears that this species possesses a similar dichotomous ramification of the 

 pinnae to that which maintains in Neur. macrophylla. 



Through the kindness of Mr C. Cash, F.G.S., Halifax, Yorkshire, I have 

 been able to compare with my specimens of Neur. macrophylla a specimen of 

 Neur. Clarksoni, Lesqx., from Olyphant, which was communicated to him by 

 Mr R. D. Lacoe, and find this last mentioned species is specifically identical 

 with Brongniart's plant. 



I am inclined to refer the figure given by Scheuchzer (loc. cit., pi. x. fig. 3) 

 to Neur. macrophylla, Brongtrr~though several writers have placed it under 

 Neur. Scheuchzeri, Hoffm. From the roughness of Scheuchzer's figure, it is 

 impossible definitely to refer it to either of these species. 



While writing my Catalogue of Palseozoic Plants in the British Museum, 

 believing that Scheuchzer's figure should be referred to Hoffmann's Neur. 

 Scheuchzeri (which, however, I treated as distinct from Neur. cor data, L. & H. = 

 Neur. hirsuta, Lesqx.), I identified in error the specimens of Neur. macrophylla 

 as Neur. Scheuchzeri, Hoffm. 



The inaccurate drawing of the nervation of Brongniart's type of Neur. 

 macrophylla prevented me from identifying the specimens in the British Museum 

 with his plant, to which, however, they really belong, and it was only on a 

 subsequent examination of the specimens in the collection of the Geological 

 Society of London that I detected the type of Neur. macrophylla, which enabled 

 me to discover my former error. 



Localities: — Dunkerton (Type); Wellsway; Radstock; Upper Conygre; 

 Lower Conygre; Braysdown; Kilmersdon. 



