558 Prof. E. W. Clay pole — Fossil Tree from the U. Silurian. 



and bordered by small spines, the surface granulated, and the 

 extremities monodactj'lous. 



The four pairs of feet were long and slender, their surfaces smooth 

 (not granulated like the forearms), and their edges bordered by- 

 small spines. Of the antennse we cannot speak, as they have not 

 been preserved. 



The specimen figured in the accompanying woodcut ^ is from the 

 White Chalk of Lewes, and probably Dr. Mantell's and Mr. Dixon's 

 specimens are from the same locality. There is also a closely 

 allied, if not identical, species preserved in the British Museum, 

 from the Upper Greensand of Wiltshire (part of Mr. W. Cunnington's 

 Collection), and another from near Ventnor (Chalk-rock?), presented 

 by Prof. T. Eupert Jones, F.E.S. 



I dedicate this species to H. Willett, Esq., F.Gr.S., whose exertions 

 on behalf of the Sub-Wealden Boring, the completion of the 

 palaeontology of the Chalk, and the success of the Brighton Museum, 

 are well known to all geologists. 



VII. — On the Occurbence of a Fossil Tree (Glyptodendron) 

 IN THE Clinton Limestone (base of Upper Silurian), of 

 Ohio, U.S. 



By Professor E. "W. Claypole, B.A., B.Sc. (London) ; 

 of Antiocli College, Yellow Springs, Ohio. 



DURING the summer of 1877 I made a geological excursion, in 

 company with one of my students, to the western part of our 

 State, to examine the junction of the Upper Silurian (" Clinton " of 

 the Ohio Survey) and the Cincinnati group of the Lower Silurian. 

 Whilst thus engaged near Eaton, in Preble Co., my companion, 

 Mr. Leven Siler, of that town, picked up and handed to me a slab 

 bearing what appeared to be a mould of the well-known bark of the 

 Lepidodendron, somewhat weathered. More careful examination 

 confirmed the first impression, and convinced me that I had in- 

 disputable proof of the existence of arborescent vegetation of an 

 earlier date than had hitherto been announced upon equally con- 

 clusive evidence. 



The fossil, of which a woodcut accompanies this paper, is on 

 the surface of a slab of marine limestone. It measures about two 

 inches and a half, by two inches, and contains nearly fifty more 

 or less distinct scars, such as mark the bark of a Lepidodendron. 

 Its surface is cylindrically concave, and has just such an impression 

 as a round stem would produce — that is, it represents a segment of 

 a cylindrical surface, of the dimensions given above, and depressed 

 about half an inch in the middle. The squeeze accurately shows 

 both the m.arks and the curvature of the surface. 



The slab containing it was not taken out of the solid rock, but 

 picked up loose on the surface of a bank close to the junction of the 



1 For permission to use this illustration from Dixon's Geology of Sussex (New 

 Edition, 1878) we are indebted to the kindness of the publisher, Mr. "W. J. Smith of 

 Brighton. 



