1909] Sinnott,— Paracedroxylon, a new Araucarian Wood 171 
separated from the ancient Abietineous stock, on the line of ascent 
toward the Araucarineae, before: ће appearance of flattened pitting; 
and in which the traumatie canals have been on the whole more 
reduced than in Brachyoxylon, having progressed still farther from the 
condition found in the Abietineae. 
The occurrence at Second Cliff, Scituate, of a primitive Araucarian 
Conifer, such as the one under investigation, is interesting in the light 
it throws on the age of the geological formation at this place. None 
of the fossils nearest in structure to our lignite, such as the widely dis- 
tributed Brachyphyllum, and numerous others whose wood structure 
has been shown to be of the Brachyoxylon type, have ever been found 
in deposits more recent than the Cretaceous. It seems quite probable, 
therefore, that the clays of Second Cliff, the age of which have been 
much in doubt, may also be referred to this period. This confirms 
the conclusions reached by JEFFREY and CHRYSLER (8) with regard 
to Third Cliff, Scituate. 
As the structure of this fossil wood is markedly different from that 
of anything heretofore described, it has been thought best to include 
it under a new genus. From its superficial resemblance to the Ced- 
roxylon type, as described by Kraus, and from the place of its dis- 
covery, the name Paracedroxylon scituatense is proposed for it. 
SuMMARY. 
1. Paracedroxylon scituatense is the wood of an Araucarian Conifer 
from the clays of Second Cliff, Scituate, Massachusetts. 
2. Its normal structure consists of tracheids and medullary rays. 
The cells of the latter are thin-walled and pitless, except next the ad- 
jacent tracheids. The annual rings are poorly marked, and on the 
face of the summer wood occur tangential pits. The radial pits on 
the tracheid walls are in almost every case circular in outline and not 
flattened by mutual contact. Bars of SANIO are entirely absent. 
3. In wounded regions occur groups of thin-walled cells which 
possibly represent abortive resin-canals. 
4. Bands of traumatic tissue may also appear near wounds. ‘These 
consist of very thick-walled parenchyma, usually bounded next the 
normal wood by septate tracheids. Where they are widest, large 
anastomosing mucilage-spaces appear in them. These probably 
