146 THE FLOEA OF THE DAKOTA GROUP. 



are perfectly entire in our species. Saporta remarks that this genus of the 

 CnesalpiuiejB is still represented iu the flora of the Mediterranean by Cera- 

 iomn sU'iqna Caronbier, which forms large, open forests along the shore from 

 Nice to Mentone. As yet no fructitication has been found with these leaves 

 in the Dakota Group, though the leaves are found iu vast numbers in some 

 localities ; rarely, however, are the pinnules joined together. 



Tliough the specimens represented by Figs. 1, 2, PI. LXVIII, have the 

 secondaries a little less distant, I consider them as of the same species. 



Habitat: Kansas. 



Tribe CASSIE^4E. 



Cassia problematica, sp. nov. 

 PI. XXXVIII, Fig. 3. 



Leaflet small, oblong or broadly lanceolate, acute, narrowed to the 

 inequilateral base, short petioled ; primary nerve narrow ; secondaries distant, 

 subopposite, thin, camptodrome. 



The leaflet, which is about 4"'" long and 1.5*"" broad at the middle, has 

 the apex destroyed. Its secondaries, of which there are fom* pairs, diverge 

 from the midi-ib at an angle of 40° and are parallel and equidistant, except 

 the lower, which follow close to the borders and are less distant from those 

 above. The inequilateral base shows it to be a leaflet of a compound leaf 

 and its general characters refer it to the genus Cassia, being similar to the 

 leaflets of C. Berenices Heer,^ which is a variable species common in the 

 Miocene of Europe. 



Habitat: Ellsworth Count v, Kansas. No. 453 of the museum of the 

 Univemty of Kansas; E. P, West, collector. 



Cassia polita, sp. nov. 



Leaflet .small, membranous, entire, oval, lanceolate or naiTowing from 

 the middle to a blunt apex and downward more rapidly to a short, flat petiole; 

 sm-face polished; nervation pinnate, camptodi'ome ; secondaries five to six 

 on each side, oblique, parallel, thin, nearly cm-ved in passing toward the 

 borders. It has the size and form of C. lignitum Ung. (Syllog., pt. 2, p. 30, 

 PI. X, Fig. 14), the leaflet being only more equilateral. The veins are thin, 

 mostly simple. 



Habitat: Kansas. 



' Fl. Tert. IJelv., vol. 3, p. 118, PI. cxxxvii, Figs. 42-56. 



