92 Proceedings of the Royal Physical Society. 



believe that U. majus, L. & H., and U. minus, L. & H , are 

 different ages and conditions of one species. I also feel 

 certain, that S. Menardi, Lesqx. (not Brongn.)/ which Zeiller 

 unites with U. majus, is likewise referable to S. discopJiora 

 {=U. minus, L. & H.). The type of U. majus appears to be 

 'lost, but the counterpart of the type of U. minus is still 

 preserved in the Hutton Collection, JSTewcastle-on-Tyne, and 

 on the careful examination of this, my identifications have 

 been made. 



III. BOTHRODENDRON, L. & H. 



Bothrodendron, L. & H., Fossil Flora, vol, ii., p. 1 (1833). 

 Rhytidodcndron, Boulay, Le terrain houiller du iiord de la France et ses 

 vegetaux fossiles, p. 39 (1876, Lille). 



In 1885 I recorded the occurrence of Rhytidodcndron 

 mimdifolium, Boulay, from Scotland, and regarded the genus 

 as distinct from all others ; but to M. Zeiller we are indebted 

 for showing that Rhytidodcndron, Boulay, is none other than 

 Bothrodendron, L. & H. To the defective descriptions of 

 Lindley and Hutton must be ascribed the cause of this genus 

 being so imperfectly known ; and had it nut been for the 

 discovery of an original specimen, communicated by Hutton 

 to the Museum of Natural History, Paris, the cloud that 

 enveloped this genus might have hung over it much longer.^ 



In M. Zeiller's memoir, to which I have already referred, 

 he figures stems and branches of Bothrodendron p^tnctatum, 

 the latter having their foliage attached. Eecently I have 

 met with specimens of B. punctatum- as also with addi- 

 tional examples of B. minutifolium in Britain. The latter 

 species I have found in several new localities, and it is 

 represented by stems and branches with their foliage attached. 

 B. punctatum I have only yet seen from the Kilmarnock 

 Coal-field, and for specimens of it I am again indebted to the 

 Kev. J). Landsborough and to Mr Blackwood, Kilmarnock. 



^ Geol. Survey of Illinois, ii., pi. xliii. 



- 1 am greatly indebted to M. Zeiller for figuring at my request the 

 authentic specimen of Bothrodendron 2^unctaiuvi, L. & H., which had been 

 presented to the Museum d'histoire naturelle by Hutton, and to which 

 reference has been made (Zeiller, I. c, pi. viii., tig. 1). 



