DESCRIPTIONS OF SPECIES. 93 



ZlZYPHUS GRONLANDICUS Heer. 

 PI. XXXIV, figs. 11, 12. 

 Zizyphus gronlandicus Heer, Fl. Foss. Arct., vol. 7, 1883, p. 42, pi. 62,. fig. 20. 



In spite of the paucity of our material and the imperfect condition of the two 

 specimens, I have but little hesitation in regarding them as belonging to this species. 



Locality: Nashaquitsa, Marthas Vineyard, PL XXXIV, fig. 11. Collected by 

 David White. Specimen in U. S. Nat. Mus. 



Gay Head, Marthas Vineyard, PL XXXIV, fig. 12. Collected by David 

 White. Specimen in U. S. Nat. Mus. 



Zizyphus Lewisiana Hollick. 

 PL XXXIV, fig. 13. 

 Zizyphus Lewisiana Hollick, Bull. Torrey Bot. Club, vol. 21, 1894, p. 58, pi. 180, fig. 13. 



The only specimen of this species thus far known is the type, the original figure 

 of which is here reproduced. 



Locality: Oak Neck, Long Island. Collected by Arthur Hollick. Specimen in 

 Mus. New York Bot, Gard. 



Rhamnus ( ? ) acuta Heer. 

 PL XXXIV, fig. 1. 



Rhamnus (?) acuta Heer, FL Foss. Arct., vol. 6 (abth. 2), 1882, p. 98, pi. 41, fig. 6; pi. 45, fig. 13c; Hollick, 

 Bull. Torrey Bot. Club, vol. 21, 1894, p. 58, pi.- 177, fig. 6. 



This specimen is apparently referable either to this species or to R. tenax Lesq., a 

 and in placing it under Heer's name I should be considered as influenced more by 

 considerations of priority than by any intention to indicate that the two species are 



distinct. 



Locality: Lloyd Neck, Long Island. Collected by Arthur Hollick. Specimen 



in Mus. New York Bot. Gard. 



Ceanothus constrictus n. sp. 



PL XXXIV, figs. 15-17. 



Leaves obovate-spatulate in outline, entire, obscurely 2-lobed or constricted above, with a retuse, emar- 

 ginate, or truncate apex and a wedge-shaped base ; secondary nerves irregularly arranged, the lower ones leaving 

 the midrib at or close to the base, extending upward subparallel with the margins and finally anastomosing with 

 the upper ones, forming a series of marginal loops. 



These leaves apparently belong in the Rhamnacese and are not unlike those of 

 the living species Ceanothus cuneatus Nutt. They do not, however, appear to be 

 strictly 3-nerved from the base, although the lower secondaries simulate lateral 

 primaries very closely. The only fossil leaf which appears at all to resemble them is 

 Ceanothus bilinicusUng., b a European Tertiary species. 



Locality: Gay Head, Marthas Vineyard, PL XXXIV, figs. 15, 16. Collected 

 by David White. Specimen in U. S. Nat. Mus. 



Glen Cove, Long Island, PI. XXXIV, fig. 17. Collected by David White. 

 Specimen in U. S. Nat. Mus. 



aMon. U. S. Geol. Survey, vol. 17 (Fl. Dak. Gr.), 1892, p. 170, pi. 38, fig. 6. 

 bChl. Prot., 1847, p. 145, pi. 49, fig. 9. 



