1911.] NATURAL SCIENCES OF PHILADELPHIA. 19 



deciduous, nor were detached leaflets of this species observed on other 

 slabs. The specimen shows the upper part of a leaf, near the apex, 

 but 20 to 30 mm. of this end is broken off. The leaflets become shorter 

 near the apex, one of the last preserved on the specimen, and very 

 near the apex, is 28 mm. long. 



Class CONIFERALES. 



Family PINACE^ 

 Palissya diffusa (Emmons). Plate III. 



This species is represented by several slabs showing parts of branches, 

 one with a length of stem of 200 mm. showing the two sides of the 

 branch on two slabs. The branches on this stem are 6 to 7 on a side 

 in a length of 200 mm. ; they attain a length of 130 mm. and the 

 ultimate branchlets extend about 20 mm. on each side of the branches. 

 Some coaly matter along the main stem indicates from its thickness a 

 considerable density for the woody stem. The leaves are crowded on 

 the branches, linear oblong, obtuse at the apex and about 1 by 3 mm. 

 They point forward at an angle of 45° and the branchlets are about 

 4 mm. wide. One of the smaller specimens is figured in Plate III. 



Palissya obtusa sp. nov. Plate IV. 



Small branches varying in thickness from 4.5 to 2 mm. in different 

 specimens; ultimate branchlets simple, very slender, terminations 

 flexuous, branchlets up to 100 mm. long, alternately attached to the 

 small branch. Leaves spreading laterally, apparently two-ranked, 

 rather widely spaced; about 30 on a side in a distance of 80 mm.; 

 they are inserted subalternately, nearly oppositely, on the ultimate 

 branchlets, attached by a short petiole, nearly sessile. The form of 

 the leaf is linear, sharply contracted at the base and obtuse at the apex, 

 which latter character distinguishes this species from P. sphenolepis 

 (Fr. Braun). Their size is 7 mm. in length by 1.5 mm. in width, the 

 midrib is generally distinct. The ultimate branchlets are deciduous, 

 at least in part, as is the case with our living Taxodium distichum (L.) 

 which this species recalls. 



This species appears upon a number of slabs, all representing ter- 

 minal or lateral twigs of a branch ; those showing definitely a termina- 

 tion are very flexuous and fernlike. The largest specimen shows 

 parts of a branch 300 mm. long and the spreading branches from the 

 main stem are 300 mm. across; parts of adjacent branches cover the 

 slab as though a limb of considerable size had been imbedded at one 

 time. Upon one of these twigs the side branchlets are simple in that 



