H4 
Slopes. — An Early Type of the 
The walls of the later-formed wood elements are greatly thickened, and in 
them pitting can be seen in the tangential direction in a number of places. 
The pitting of the spring tracheides is essentially Araucarian, the larger 
elements having three rows of adjacent alternating pits with hexagonally 
compressed borders (see Text-fig. 2, and PL IV, Fig. 2). In several places, 
towards the ends of tracheides, and in the later-formed elements of each 
/. 
Text-fig. 2. Planoxylon Hectori , sp. nov. Radial section through medullary ray at junction 
of spring tracheides and last-formed elements of previous season, s., tracheides showing the three 
rows of adjacent hexagonally compressed pits of Araucarian type, g, tracheide with pits in irregular 
groups, ep ., 1 Abietinean pitting ’ of end walls of medullary ray cells, p ., pits connecting radial walls 
of medullary ray cells with adjacent tracheides ; note that in the region of the large spring elements 
these are in three vertical pairs per tracheide-field. par., parenchyma cells lying between spring 
wood and last element of previous season t., these parenchyma cells are thickened and pitted in all 
directions : cf. par. Text-fig. i. [Slide No. 52823 c, Brit. Mus. (Nat. Hist.).] 
zone, the pits tend to be rounded off and to group themselves irregularly in 
groups of 3, 4, or 5, very much like those figured in the two left-hand tracheides 
of Gothan’s Fig. 14B, p. 26 (see Gothan, 1907 ), for his Cedroxylon transiens ; 
see Text-fig. 2, tracheide g., in the present paper for comparison with 
Gothan’s specimen. 
The later-formed wood has two rows, or one row of adjacent pits, while 
the latest formed wood has a single row of isolated pits. The average 
diameter of these bordered pits is 17-18 fi, which appears to be exception- 
ally large. In spite of what has been written on the subject, I do not feel 
