XLJV] CTJPRESSINOXYLON 197 



long. 122° W., during the voyage of H.M.S. Investigator in 1851. 

 Through the kindness of Prof. Johnson I was able to have sections 

 cut from Dr Cramer's specimen in the Dubhn Museum. 



Annual rings clearly marked; summer- wood narrow. The 

 most striking feature is the irregular distribution and unusually 

 large number of small bordered pits on the radial walls of the 

 tracheids. The pits vary in size and have an average diameter 

 of 13-77^; they are usually separate but occasionally those of a 

 single row are in contact. There are frequently as many as 3 — 4 

 rows (fig. 718, A) and occasionally 5 opposite and separate pits, 

 a feature suggesting comparison with Pinus Merhtisii^, but in that 

 species the pits of the three opposite rows are in contact. Rims 

 of Sanio'are occasionally present. Rows of narrow parenchyma 

 occur in different regions of the wood. Medullary rays uniseriate, 

 1 — 16 cells deep, with 2 — 4 simple large oval pits in the field 

 (fig. 718, D) ; there are no pits on the other walls of the ray cells. 

 The pitting in the field is very similar to that in Taxodium and- 

 Cwpressinoxylon (Taxodioxylon) Taxodii (fig. 720, A, B). 



Cwpressinoxylon taxodioides Conwentz. 



Under this name Conwentz^ describes some wood, probably of 

 Pliocene age, from California which he compares with Sequoia 

 sempervirens: He speaks of one stem 22 metres long and with a 

 maximum diameter of 3 — 4 m. ; the bordered pits are in 1 — 2 rows 

 on the radial walls and small pits occur on the tangential walls; 

 the medullary rays are usually two-cells broad and have 3 — 4 

 generally elliptical pits in the field apparently simple and arranged 

 in a horizontal row. The rays are usually 15 — 20 cells deep but 

 may reach a depth of 56 cells. Resin-parenchyma occurs in 

 vertical rows but it is not stated whether it is confined to any 

 definite region of the wood. 



Schmalhausen's species Cwpressinoxylon {Glyptostrohusl) neosi- 

 biricum^, characterised by medullary rays 13 — 20 or even 40 — 48 

 cells deep, and 1 — 2 circular or oval pits in the field, though com- 

 pared by him with Glyptostrohus, cannot safely be regarded as more 

 nearly allied to that genus than to some other members of the 

 Cupressineae. 



^ Groom and Eushton (13) p. 484. ^ Conwentz (78) Pis. xiii., xiv. 



3 Schmalhausen (90) PI. ii; pp. 44 — 49; Gothan (05) p. 50. 



