[i-ii.Nii allow] NoKTII AMKRICAN Sl'lOCJKS OF DADOXYLON 77 



curved ; the lateral walls showing no structure which has been 

 obliterated by decay; the cells 3-5 Lracheids long. 

 Tangential.— Rays numerous, medium, 1-3 seriate; the cells round, thin- 

 walled, 47 mic. broad. 



Cll'UKSSINOXYLOX COM ANCUKN'SK, .11. sp. 



CollockHl by I'rof. Prosper from the Comanche Cret^ieeous (?) N. W. 

 of Ashland, Clark Co., Kansas, LS'jr. The material is badly preserved 

 and some of the details cannot be inixde out satisfactorily, especially if 

 the pits are 1 or a seriate. It bears a very striking resemblance to 

 some of the Cupressineie. 



Transverse— Tracheids in regular, radial rows, rounded, very uniform, 44 x 44 

 broad, the walls 12.5 mic. thick. Resin passages and special resin cells 



Growth rings prominent, about 10 in a radial extent of 22 mm.; 

 the summer wood thin, composed of 2-4 rows of tracheids, the latter 

 about 22 mic. wide, th« walls 12.5 mic. thick. 



Resin passages and resin cells wholly wanting. 



Worm borrows are frequent and show copious exudation of 

 resin which has often preserved the adjacent structure from decay. 

 /i'ffdi«?.— Ray cells of one kind only, straight; the upper and lower walls thin 

 and not pitted; the terminal walls thin, not pitted, chiefly curved; 

 the lateral walls with oval, bordered pits about 1-2 per tracheid, the 

 oblong or broadly lenticular orifice nearly as long as the pit; the 

 cells equal to about 4 tracheids. 



Bordered pits round, large, 19 mic. broad; in one or sometimes 

 2 rows, the orifice round. 

 Tangential— Rsiys uniseriate, the cells thin-walled, round, 19 mic. broad. 



Araucarioxylon Prosserf, n. sp. 



One of the Prosser collection from the Cheyenne (Comanche 

 Cretaceous), of the Blulf west of Sun City, Medicine Lodge Kiver, 

 Baker Co., Jvansas, 1897. 



7Va«sm-sr.— Tracheids in regular radial rows, squarish, 39x42 mic. broad; 



the walls 6.2 mic. thick. 



Resin cells and special resin passages wholly wanting. No 



evidence of growth rings in a radial extent of 22 mm. 

 Radial— Ray cells all of one kind, straight or narrower at the ends, equal to 



3-9 tracheids; the upper and lower walls thin, and devoid of pits; 



the terminal walls thin, not pitted, curved; the lateral walls show 



no structure through extreme alteration. 



Bordered pits not clearly determinable, but probably round and 



in one row. 



Tangential— Rays numerous, chiefly low; the cells broad, round, about 31 

 mic. wide. 



