120 
Slopes. — An Early Type of the 
i. Planoxylon Lindleii (Witham). 
1831. [no name] described and figured, Witham, ‘ Observ. foss. Veg.’ 
1833. Pence Lindleii (later P. Lindleyana ), Witham, ‘Intern. Struct, foss. 
Veg.’, p. 58 et seq., PL IX, Figs. 1-5 ; PL XV, Figs. 1-3. 
[Various references as Pmites or Pence Lindleii by Unger and others, 
see Seward, 1904 ). 
1904. A raucarioxylon Lindleii , Seward, ‘Jurassic Flora’, vol. ii, p. 56 et seq., 
and PL VI ; PL VII, Figs. 2, 3, 5. 
Species based on branches, some not less than 12 cm. in diameter. 
Diagnosis. Growth rings very distinct. Medullary rays from 1-12 
and more cells in vertical height ; end cells of ray irregular in outline in radial 
section, suggestive of early stage of ray-tracheide formation. Pitting, &c, 
characteristic of genus. Wood parenchyma scanty. Resin canals irregu- 
larly present, principally in spring wood. 
Horizon : Upper Lias. 
Locality : One mile south of Whitby, Yorkshire, England. 
Type\ Witham’s specimen, found before 1831 by Mr. Nicol. Slide 
No. 51484 British Museum (Nat. Hist.). Other figured specimens'. Nos. 
51488 , 51449 , 51724 , Geol. Depart. British Museum (Nat. Hist.), see 
Seward’s Catalogue, 1904. 
2. Planoxylon Hectori , sp. nov. 
Text-Figs. 1-4, PL IV, Figs. 1-5. 
Species based on large trunk, over 150 years old. 
Diagnosis. Growth rings very distinct. Spring tracheides 40-55 /x 
in diameter, with three rows of hexagonally bordered, alternating bordered 
pits, each averaging 17-18 ju in diameter. Intermediate elements with pits 
in irregular groups, late wood with single rows of isolated pits. Medullary 
rays 1-2 1 cells high, chiefly 3-9 cells high. Ray cells all alike. ‘ Abietinean 
pitting ’ very conspicuous. Pits in radial walls of rays in vertical pairs, 
1-3 per tracheide-field. Wood parenchyma apparently infrequent, all cells 
thickened and pitted, walls rectangular. Resin canals apparently entirely 
absent. 
Horizon'. Cretaceous (Upper or Middle), 
Locality : Amuri Bluff, New Zealand. 
Type (and only specimen) : No. 52823 British Museum (Nat. Hist.) 
Geol. Dept., presented in 1875; and six slides cut from it in 1914. 
Collector : Probably Dr. Hector. 
Note . — I think it is extremely probable that both Gothan’s Cedroxylon 
transiens and his Protocedroxylon araucarioides should be included in this 
genus ; but I hesitate to transfer them to it because I have not seen his 
original specimens, and though his figures do not demonstrate all the 
