94 



a species from which all our Cretaceous forms differ by their round-obtuse 

 lobes. The same characters separate them from the Tertiary species of 

 Europe, L. procacini and its numerous varieties, which all are more or less 

 acutely-lobed. 



Habitat. — Near Fort Harker, Kansas ; No. 6432 of the collection of the 

 Smithsonian Institution. 



Menispermites, Lesqx. 



Leaves large, coriaceous or subcoriaceous, broadly deltoid, more or less 

 distinctly three-lobed, with obtuse divisions, and borders entire or undulate ; 

 nervation palmately 3-5 nerved, from a peltate or subpeltate, truncate 

 or subcordatc base ; primary veins craspedotlrome, their points joining the 

 borders of the lobes, but their divisions following along them by a series of 

 curves upon each others, or of multiple festoons, as seen in the leaves of the 

 present Menispermum canadense especially. The divergence from this last 

 type is marked in one species only, whose nervation agrees with that of Men- 

 ispermum [Cocculus) carolinum, &c. The leaves referred to this genus have 

 been described formerly as Acer or Acerites, Dot)ibe)jopsis, even Populates. 

 Their essential characters seem to refer them all to this section. 



Menispermites obtusiloba, sp. nov., PL xxv, Figs. 1-2 ; PL xxvi, Fig. 3. 



Leaves large, coriaceous, broadly deltoid or nearly round, obtuse in outline, peltate, 3-5-nervcd, 

 deeply undulate. 



These leaves are thick, variable in size, the largest 20 centimeters 

 long, 15 centimeters wide, reniform-deltoid in outline, obtuse, peltate, en- 

 larged, and truncate at base, obscurely three-lobate, with borders deeply 

 undulate ; five-nerved ; primary nerves under various degrees of divergence, 

 much branched, subcraspedodrome, their points reaching the borders with 

 camptodrome divisions anastomosing in bows along the borders and along 

 the veins, with two to four veinlets under the primary veins, around the 

 point of attachment of the petiole. The leaf (PL xxv, Fig. 1) is the better 

 preserved one of this species. I have, however, seen fragments indicating 

 leaves of a larger size. In this the three-lobate form is more marked than 

 in the other figured specimens. It is evident that the leaf (PL xxvi, Fig. 3) 

 belongs to the same species. In PL xxv, Fig. 2, the base of the leaf is 

 destroyed ; but the union of the primary nerves and of the basilar veins 

 is clearly seen as being above the borders. The middle nerve is not 

 branching ; at least, no trace of secondary veins could be seen on the spec- 



