152 MESOZOIC FLORAS OF UNITED STATES. 



2. PLANTS FROM HEBENDEEN BAY, ALASKA. 



Pterophyllum alaskense Fontaine n. sp. 



PL XXXVIII, Figs. 19, 20. 



This is a fragment of a cycad leaf which is most probably a Ptero- 

 phyllum. It belongs to that type of Pterophyllum of which P. rajmaha- 

 lense Morris is the most important example. This, however, seems to be a 

 new species. The leaflets are remote and attached to the side of the axis 

 or midrib by the whole of a somewhat widened base. This is the most 

 important difference distinguishing this plant from P. rajmahalense. The 

 leaflets are oblong in form, with very obtuse ends. As is common in 

 Pterophylla of this type, they show some variation in width even in the 

 same compound leaf. The length for the average size is about 14 mm. 

 and the width above the base 4 mm. The nerves are not well shown, but 

 seem to be slender and numerous, parallel, and about 12 in number. 

 They may be more numerous in the wider leaflets. The texture of the 

 leaflets is rather thin. Owing to the expansion of the bases of the leaflets 

 they touch one another in those parts and are even united there with a 

 U-shaped sinus. The largest leaflets may be twice as wide as the narrow- 

 est. As in the case of P. rajmahalense, the variation in size is mainly in 

 the width, the length remaining pretty constant. 



The specimen is shown natural size in PI. XXXVIII, Fig. 19, and a 

 portion of it enlarged in Fig. 20. 



Only a single specimen of this plant was found. It was collected by 

 Mr. Ernest S. Locke from the ' ' coal measures ' ' of Herendeen Bay, 

 Alaska. Doctor Stanton states that the invertebrates accompanying 

 this plant are Aucella crassicollis, a Lower Cretaceous species. 



3. PLANTS FROM THE COPPER RIVER REGION, ALASKA. 



Sagenopteris alaskensis Fontaine n. sp. 



PL XXXVIII, Fig. 21. 



This plant is found in only one specimen, which is a nearly complete 

 leaf, apparently a lateral one of the cluster characteristic of Sagenopteris. 

 It was collected by Mr. A. C. Spencer from the Copper River region of 

 Alaska, on Nikolai Creek near Nikolai. It is apparently one of the lateral 



