i66 THE RARITAN FLORA. 



Description. — Leaves compound, generally of 2. rarely 3, 

 elliptical or oblong-lanceolate, unsyn.>metrical, entire, petiolate 

 leaflets. Leaflets variable in size and outline, usually con- 

 siderably curved and unsymmetrical, broadest on the outside, 

 ranging from 3 cm. to 8 cmi in length and from: 1.2 cm. to 3 cm. 

 in breadth. Apex obtusely pointed to acute, sometimes somewhat 

 recurved. Base cuneate. Midrib narrow, curved. Secondaries 

 slender, often seen with difficulty, 6 to 8 pairs, oblique, parallel, 

 camptodrome, the lower long cuiwed and approximately parallel 

 with the margins. 



This species was described by Lesquereux from rather abun- 

 dant remains preserved in the Dakota sandstones of Kansas, and 

 it has since been recorded from the Raritan or the Magothy for- 

 mations of Marthas Vineyard, Long Island and New Jersey. 

 The Raritan form is of the smaller, more obtuse type, but is 

 almost an exact counterpart of Lesquereux's pi. 41, fig. 14. The 

 Magothy forms are also smaller than most of the Dakota Group 

 forms. Some of these latter are especially interesting in that 

 they show the entire leaves, which are of the following character : 

 The common petiole is stout for a distance of from 5 mm. to 15 

 mm., where it forks into- two stout branches lO' mm. to- 15 mm. 

 long, each subtended by a single leaflet. Occasionally there are 

 three leaflets instead of the normal two. 



A species of Hymenaea was described by Saporta from the 

 Cenomanian of Bohemia^ which shows considerable resemblance 

 to the American form. Later collections described by Vele- 

 novsky- contain many leaves which he identifies with Soparta's 

 species, Hymenaea primigenia, which he finds is rarely entire 

 and usually with a crenate-dentate margin. Hollick records^ 

 forms similar to the latter from the Marthas Vineyard Creta- 

 ceous, which is probably more recent than the New Jersey Rari- 

 tan. 



The forms from the Atane beds of Greenland which Prof. 

 Heer described as Dalbergia Rinkiana^, are very similar to the 



' Le Monde des Plantes, p. 199, f. 2, 1879. 

 *F1. Bohm. Kreidef. theil 3:9, pi. 5, f. 4; pi. 6, f. 1-4, iS 

 'Mon. U. S. Geol. Surv., vol. 50:84, pi. 32, f. 8, 9, 1907. 

 *F1. Foss, Arct., vol. VI, ab. 2: 102, pi. 26, f. 1-3, 1882. 



