[Illustration: Fig. 488. _Pitys primaeva._ A, transverse section of the secondary xylem; B, tangential section of the secondary xylem. (From sections of the type-specimen in the Edinburgh University Botanical Department.)] _Pitys Withami_ (Lindley and Hutton). The Craigleith Tree. 1831. _Pinites Withami_ Lindley and Hutton, Foss. Flora, Vol. +i.+ Pl. +ii.+ 1831. _Pinites medullaris_, Ibid. Pl. +iii.+ 1902. _Pitys Withami_ Scott, Trans. R. Soc. Edinb. Vol. +xl.+ p. 354, Pl. +ii.+ fig. 10: Pl. +vi.+ fig. 21. This species was founded on some sections cut from an incomplete stem 36 feet long obtained in 1826 from the Calciferous sandstone of the Craigleith quarry near Edinburgh. The specimen named by Lindley and Hutton _Pinites medullaris_ is no doubt specifically identical with the larger stem. In the same year (1831) Witham[766] published an account of a still larger stem from the same locality, 47 ft long and 5 ft in diameter in the lower part, and in his book the name _Pinites Withami_ is adopted. A large specimen of this tree is erected in the grounds of the Natural History Museum, London, and other specimens are preserved in the Edinburgh Botanic Garden. Goeppert in 1850 referred the species to _Dadoxylon_ and later to _Pitys_[767], while Brongniart[768] assigned it to his genus _Palaeoxylon_. Scott[769], who examined Witham’s sections placed it in _Pitys_. The pitting of the secondary tracheids is often multiseriate, but the medullary rays are narrower than in _Pitys antiqua_ and _P. primaeva_, rarely exceeding 4 cells in breadth, though still of the manoxylic type. Primary-xylem strands occur in the peripheral region of the pith agreeing closely with those of _P. antiqua_. There are no regular and continuous annual rings though as Witham stated there are concentric markings on the wood which superficially resemble true rings. The leaf-traces are single and in their passage through the cylinder of wood an arc of secondary tracheids is added to the primary elements. =Archaeopitys.= Scott and Jeffrey.