88 DESCRIPTION OP SPECIES. 



to 30 centimeters broad between the lateral lobes. Some of them, appar- 

 ently constituting a variety of the normal form, are not half as large, their 

 nervation is still coarser and the surface rugose, as in pi. xiii, fig. 1, and 

 especially pi. xiv, fig. 1. All have been found at the same locality, mostly 

 alone. There is also a marked difference in the expansion of the peltate 

 base, which is generally half-round, as in pi. xiii, figs. 1, 3, but which 

 sometimes is regularly dentate lobate around, as in pi. xiii, fig. 5. But 

 this fragment may be referable to the following species. 



Hab. — Found in numerous specimens 3J miles south of Fort Harker. 

 Chs. Sternberg. 



Aspidiopliy lliiiii dentatum, sp. nov. 



Leaves smaller, palmately tbree-lobate, peltate at the base; lateral lobe.s tri- 

 lobate, the medial long-, all dentate in the upper part; secondary nerves camptodrome ; 

 base of the leaves contracted into a fan-like flve-lobed basilar shield. 



The leaves have the same general facies as those of A. trilohatumy 

 differing by their texture not being as thick, the nervation not as coarse, 

 and by the base of the leaves being contracted under the point of division 

 of the primary nerves into a narrow neck half a centimeter broad only, 

 and then abruptly enlarged into a fan-like five-lobed or deeply dentate 

 shield or stipule 4 centimeters broad between the summits of the lateral 

 teeth and 2 centimeters vertically from the base of the medial nerve to the 

 end of the lower lobes. This form or species with the dentate borders of 

 the middle lobes and the subdivisions of the lateral lobes has its affinity 

 to Sassafras [AraliopsisJ cretacenm, while the preceding species has it to 

 S. fAraliopsisJ mirahile. Another specimen of the same group shows the 

 basilar shield transversely oval and entire, stipuliform, also separated from 

 the leaf by a narrow neck. But of this I have seen only a mere fragment, 

 the base of a leaf. It possibly represents still another species. 



Hah. — Eight miles northeast of Minneapolis. Chs. Sternberg. Speci- 

 mens 607 and 614 of the Museum Comp. Zool. Cambridge. 



Aspidiophyllimi platauifoliuin, sp. nov. 



Plate II, Fig. 4. 



Leaves of various sizes, thinner or not coriaceous, rhomboidal in outline, irregu- 

 larly short trilobate, triple-nerved high above the base; secondary nerves distant and 

 irregular in position and direction, craspedodrome, with camptodrome divisions. 



The few leaves I have seen of this species are about of the same size, 



