420 MR. A. C. SEWARD ON A NEW SPECIES OF CONIFER, 
the variety and number of its species, the flora of this epoch 
seems to have been almost equal to that of which so many 
specimens have been obtained from the older Jurassic beds of 
the Yorkshire coast and other districts. 
There is abundant evidence that in Lower Cretaceous and 
Upper Jurassic times Pinites was widely distributed ; species 
have been recorded from England, France, Germany, Austria, 
Russia, Portugal, Belgium, Greenland, Spitzbergen, North 
America, Japan, and other parts of the world. 
Pinrres (§ Prryoxyton) Rurrorpt, Seward, Cat. Mesozoic PI. 
Brit. Mus. (Wealden Fl.), part 11. p. 199, absque descriptione. 
Pinites ligni stratis concentricis distinctis, tracheidis punctatis, 
punctis rotundis discretis in und serie vel in dudbus seriebus 
in eodem plano horizontali juxtapositis, ductis resiniferis 
copiosis; radii medullares uni- vel multiseriales e cellulis 
parenchymatosis formati; cellule parenchymatosse porose in 
medio radiorum multiseriatium ductum resiniferum solitarium 
includentes. 
Annual rings well marked. Resin ducts numerous, occurring 
in regular rows in the spring and summer (autumn) wood, and 
scattered irregularly throughout the xylem tissue. Bordered 
pits on the radial, and rarely on the tangential walls of the 
tracheids, in single or double rows; when in a double row the 
pits of the two rows are opposite; the pairs of pits being on the 
same horizontal line. Medullary rayS nnmerons, consisting of 
one row or more than thirty rows of cells, as seen in tangential 
section; the radial walls possessing simple oval or circular pits. 
In most cases the medullary rays are made up of a single 
vertical row of cells, but broader rays of more than one tier 
are fairly abundant, and often contain horizontal resin passages. 
Xylem parenchyma surrounds the resin ducts, and frequently 
the cavity of the ducts is occupied by large rounded cells, 
which appear to have grown like tiillen into the resin passage. 
Type Specimen in the British Museum (V. 2504). 
In a transverse section* 2°7 cm. in length, there occur 18 well 
marked ‘“‘annual” rings, which show a striking irregularity in 
their relative breadth. The width of the broadest zone being 
* The specimen on which the species, Pinites Rufforci, is founded is 
probably a portion of a stem. Dr. Conwentz, to whom I showed the 
sections during his recent visit to England, expressed this opinion after a 
hurried microscopical examination. 
