360 Mr. R. Kidston on new 



the lateral cicatricules, nor does his drawing show it very 

 clearly ; but he says the central cicatricule consists of " two 

 vascular points placed close together and often confluent." 



In some of the leaf-scars of Sigillaria McMurtriei there 

 is the same appearance in the central vascular cicatricule (see 

 fig. 3 b) . A similar structure occurs in the vascular impres- 

 sion of Sigillaria Lorivayana, Dawson *. 



In Sigillaria Moureti, Zeiller f, a somewhat similar struc- 

 ture of the vascular cicatricule also occurs. 



I have entered very fully into the description of Sigillaria 

 McMurtriei to show that it is a true member of the genus 

 Sigillaria ; and from the great similarity of Lepidodendron ? 

 tumidum, Bun bury, to Sigillaria McMurtriei in all general 

 points, I think there cannot remain any doubt as to its also 

 being a Clathrarian Sigillaria. Bunbury himself expresses 

 his difficulty in regard to the position of his plant, and says 

 that it would be referred by some to Lepidodendron and by 

 others to Sigillaria. 



I first observed this species in the collection of Mr. J. 

 McMurtrie, Radstock, after whom I have great pleasure in 

 naming it. Mr. McMurtrie has not only carefully collected 

 the fossil plants of the Radstock Coal-field, but has done 

 much to elucidate the geology of his neighbourhood. I 

 also take this opportunity of expressing my thanks to him 

 for much valuable assistance received while examining the 

 fossil flora of the Radstock Coal-field. 



Horizon. Radstock series of the Upper Coal-measures. 



Locality. Tyning Pit, Radstock, Somersetshire. 



2. Sigillaria coriacea, Kidston, n. sp. (PI. XT. fig. 2.) 



Description. Ribs alternately widening and contracting ; 

 leaf-scars placed on the dilations, wider than high, with a 

 slight sinus on their upper margin ; lateral angles prominent, 

 situated about the centre of the scar, with downward-running 

 ridges ; vascular cicatricules placed above the middle of the 

 leaf-scar, the two lateral lunate, the central punctiform. 

 Outer surface of the bark ornamented with a fine granu- 

 lation. 



Remarks. The only specimens of this fine Sigillaria with 

 which I am acquainted are those in the British Museum, 



* Dawson, ' Fossil Plants of Lower Carboniferous and Millstone-grit 

 Formations of Canada,' p. 43 (woodcut), 1873. 



t Zeiller, Bull. Soc. Geol. de France, 3 e ser. vol. viii. p. 210, pi. v. 

 tiff. 3. 



