DESCRIPTION OF SPEOIES. 167 



Paliiirus membranaceus Lesq. 

 PI. XXXV, Fig. 5. 

 Cret. Fl., J). 108, PI. xx, Fig. 6. 



Leal" siiiall, subcoriaceous or membranous, oval, obtusely pointed, 

 sliort-obtusoly lobate near tlie apex, narrowed-cuneiform to the base, triple 

 nerved; lateral primaries strong, oblique, ascending to tlie lobes, brancliiu"- 

 outside, anastomosing, witli nervilles at right angles i'rum the median nerve; 

 secondaries consisting of tour pairs, proximate, camptodrome. 



Perhaps this leaf represents a different species from that in Cret. Fl. 

 (loc. cit.). It is a little smaller, less broadly obtuse at the apex, has the 

 two small lateral lobes more marked and the base more narrowlv cuneate. 

 Though these differences may be observed, the secondary nervation beino- 

 of the same type and the presence or absence of upper lateral small lobes 

 or teeth being frequently observed in species of this genus, as for instance 

 in P. Colomhi Heer, of which the numerous figures show more marked differ- 

 ences than are seen between these two Cretaceous leaves, it seems rii>-lit to 

 refer them to the same species. 



Habitat: Pipe Creek, Cloud County, Kansas. No. 4068 of the collec- 

 tion of Mr. R. D. Lacoe. 



ZlZYPHUS DAKOTENSTS, Sp. nOV. 



PI. XXXVI, Figs. 4-7. 



Leaves subcoriaceous, petioled, narrowly elliptical, rounded or decur- 

 ring at base in narrowing to the jietiole, tapering upward to an acute apex, 

 equilateral, distantly, sparingly dentate on the borders; five-nerved from 

 the base. ' There are four fragments of leaves, one preserved nearly entire, 

 7.5"'" long, 15°"° broad below the middle, the others much larger, the upper 

 part destroyed, being about twice as long, 2.5"'° broad. The teeth of the 

 borders are distant, cut at right angles and blunt at apex. The median 

 nerve, which is enlarged at base to a petiole nearly "i""' long, is compara- 

 tively long, the inner lateral nerves being distinct though thin, ascending to 

 two-thirds the length of the leaves, pai-allel to the borders, branching outside 

 in very thin tertiaries, anastomosing in areoles with an outer, shorter mar- 

 ginal nerve, joined by very thin inside nervilles, transversely passing out 

 from the midrib. 



This fine species has no close analogy with any of tlie published fossil 

 species, the nearest relative being Z. undulatus Ett.', representing in three 



' Fl. V. Sagor, pt. 2, p. 196, PI. xvi, Figs. 4-6. 



