298 BEACHXPHYLLiral. 



1854. Brachyphyllum mamiUare, Morris, Brit. Foss. p. 3. 

 1864. Brachyphyllmn mamillare, Leckenby, Quart. Journ. Geol. Soc 

 vol. XX. p. 76. 



Thuites expansiis, ibid. 

 1870. BrachyphijUuin mamillare, Sohiniper, Trait, pal. veg. vol. ii. p. 335. 



B. Phillipsi, ibid. p. 336. 



1875. Brachyphyllum mamillare, Phillips, Geol. Yorks. p. 229. 

 Thuites expansus, ibid. p. 229, pi. x. fig. 11, lign. 59. 



1876. ? jBchinostrohiis [Thuites) expansus, Feistmantel, Pal. Ind. pi. ix.- 



figs. 6-9. 



1877. ? Brachyphyllum mamillare, ibid. pi. x. fig. 12 ; pi. xi. figs. 12 and 13.- 

 1884. Brachyphyllum mamillare, Saporta, Pal. Fran9. vol. iii. p. 326,. 



pi. clxii. figs. 3-7. 

 1890. Brachyphyllum mamillare, Scbenk, in Zittel, p. 301. 

 1892. Brachyphyllum mamillare, Fox-Strangways, Tab. Foss. p. 137. 



T/mites expansus, ibid. p. 141. 

 1900. Brachyphyllum mamillare, Seward, Manchester Lit. and Phil. Soc 



vol. xliv. p. 17. 



Type-specimen. The original of pi. clxvii. of' Lindley & Huttoii 

 is in the Manchester Museum (jS'o. 52). 



In. hahit the branches of Braoliypliyllum mamillare resemble those- 

 of Arthrotaxis cupresaoides, Don ; the branches of different order are 

 given off at a fairly wide angle. The leaves are small, fleshy, 

 triangular in shape, vrith a median dorsal keel, crowded and' 

 spirally disposed. There is no satisfactory evidence as to the 

 nature of the flowers. 



There has been some confusion on the part of palseobotanicar 

 authors between Brachyphyllum mamillare, Brongn., and Thuites 

 expansus, Sternb. ; the specimens to which Phillips and Lindley & 

 Hutton applied the latter name are undoubtedly identical with 

 those designated by Brongniart Brachyphyllum, mamillare. 



The specimen from the Gristhorpe plant-bed, which is figured, 

 by Lindley & Hutton as Thuites expansus, is, I have no doubt, 

 specifically identical with the plant which these authors represent 

 in plates olxxxviii. and ocxix. as Brachyphyllum mamillare. The 

 specimen has a length of 9'5 cm., and represents an imperfectly 

 preserved twig, bearing short lateral branches clothed with 

 spirally disposed and fleshy broadly triangular scale-leaves, closely 

 adpressed to the axis. Each leaf terminates in a sharp point, 

 and is traversed on the abaxial surface by a fairly prominent 

 median ridge.' 



' Seward (CO), p. 18. 



