20 PROCEEDINGS OF THE ACADEMY OF [Jan., 



portion towards the trunk of the tree, about 70 to 100 mm. long; these 

 are succeeded towards the apex by compound branchlets 150 to 200 mm. 

 long, the little ultimate branchlets upon which are 20 to 30 mm. long. 

 The entire branch evidently expands from the base and tapers again 

 towards the apex recalling the frond of a fern, as is the case with our 

 "cedar" or arbor vita? of the Pacific coast, Thuya plicata D. Don. 



Cheirolepis muensteri (Schenk). 



This species is represented by some small portions of branches on 

 two of the slabs. While the preservation is very perfect and the char- 

 acters well shown, the surfaces of the specimens exposed are small in 

 each case. The best one shows a portion of a branch with 8 complete 

 ultimate branchlets on one side and fragments of the ultimate branch- 

 lets on the opposite side. These ultimate branchlets are 18-20 mm. 

 long, very thin and flexuous, and tapering from a little over 2 mm. to 

 a point. They are densely leafy, the scale-like leaves being about 

 2 mm. long and pointing forward at a sharp angle, closely crowded 

 and decurrent at the base. The tip of the leaf is acuminate, pointing 

 forward as a spine; the midrib is pronounced. The best specimen is 

 on a slab with Palissya obtuso. The tapering of the ultimate branch- 

 lets is due to the leaves' becoming smaller and more closely appressed 

 to the axis of the branchlet towards the tip. 



Cheirolepis latus sp. nov. Plate V. 



This species is represented on two slabs, one specimen showing the 

 terminal part of a branch. On this specimen the branchlets near the 

 trunk end are 80 mm. long and 25 mm. wide; ovate lanceolate in 

 outline and they stand at 90° from the stem; towards the terminal 

 part they stand at an angle of 80° and they are 60 mm. long, tapering 

 from 15 mm. wide at the base to a point, at the apex of the branchlets, 

 making them linear lanceolate in outline. The branchlets are nearly 

 opposite upon the stem, or sometimes more nearly alternate; they are 

 deciduous, leaving a scar projecting where they fall. The main stem 

 is marked by strong, acutely pointed scales or leaves, covering these 

 points of attachment of the branchlets; these scales often become 

 reflexed after the branchlets fall and produce the appearance of hooks 

 pointing backward on the stem. The ultimate branchlets are two 

 ranked upon the larger branchlets from the stem above described; 

 they are arranged sub-alternately to nearly oppositely, but they are 

 never truly opposite; they are covered with densely crowded leaves 

 which are spirally arranged in four ranks, closely appressed and scale- 

 like, apparently decurrent at the base. . 



