395 



the lateral ones forking, all thick, flat, and deep, passing up to the point 

 of the obtuse lobes in preserving the same thickness. 



No trace of secondary nervation or reticulation is observable on these 

 leaves, of which we have a number of specimens. One of them has an 

 abnormal division, one only of the lateral veins being forked, and, there- 

 fore, the leaf is four-lobed, with one of its sides in an acute angle to the 

 petiole, while the other is open, nearly truncate, or in right angle to the 

 petiole. 



18. Aralia semi-orbiculata, sj). nov. 



This species differs essentially from the former by the base rounded 

 to the petiole. The thickness of the primary veins"^and of the texture 

 of the leaves is the same as in the former species; the lobes are, how- 

 ever, unequal in width, and the external sinuses acute. Though the 

 shape is far different from that of the leaves of the former species, it 

 may represent a mere variety. The external lateral veins curve more 

 or less inward, and the borders follow this curve, which is contrary to 

 the normal direction of the lateral veins of a five-lobate leaf. As we 

 have one specimen only representing it, the persistence of the specific? 

 character is uncertain. 



19. Aralia Towtsteri, sp. nov. 



Leaves large, coriaceous, palmately five-lobed to below the middle; 

 lobes oblong, obtnse or obtusely pointed, entire; primary nerves three 

 from the top of the petiole, the lateral ones forking; secondary veins on 

 an open angle of divergence, thin, curving to and along the borders, 

 camptodrome ; areolation equally distinct, quadrate or polygonal by the 

 subdivision of veinlets at right angle to the veins. 



Two external lobes only of this beautiful species are preserved ; they, 

 however, distinctly show the characters of a whole leaf. The nervation 

 and areolation are of a type far different from that of Aralia Saportana; 

 the first is related to that of Sassafras; this to Aralia. 



20. Hedera ScniMPEBi, sp. nov. 



Leaf subreniform, broader than long, rounded at the top, abruptly 

 narrowed or broadly cuueate to a short petiole enlarged at its base; 

 three-nerved from above the base; lateral veins curving toward the 

 borders, one directed inward, the other outward, anastomosing by thick 

 branches and nervilles with the branches of the short distant secondary 

 veins, curving along the borders, reaching the slightly distantly dentic- 

 ulate borders by short veinlets. 



The nervilles by subdivision in right angle form broad equilateral 

 or polygonal areas ; the borders at or near the base are followed by 

 one or two pairs of marginal veins anastomosing in curves, and by ner- 

 villes to the veins above. Except that the secondary veins are alternate, 

 this leaf closely resembles, by its nervation and areolation, the common 

 Ivy [Hedra helix). It is, however, far different by the form of the leaf 

 and especially by its short petiole. 



Genus AMPELOPHTLLUx\r, gen. nov. 



Leaves round in outline or broadly obtuse, round, truncate, or more 

 or less attenuated to the base with entire or undulate borders ; three- 

 nerved from the top of the petiole or from a distance above the base : 

 lateral primary veins branching ; marginal veinlets one or two pairs or 

 more ; secondary veins either opposite and at equal distance, or alter- 



