PLIOCENE PISLLYPAMPA BOLIVIA 181 



margins and a coriaceous texture. Length about 14 cm. 

 Maximum width about 3.25 cm. Petiole missing. Midrib 

 stout, prominent on the under "side of the leaf. Secondaries 

 stout, about nine pairs ; they diverge from the midrib at 

 angles of about 45 degrees, sweep upward in long ascending 

 sub-parallel curves, ultimately losing their individuality in 

 gradually diminishing arches parallel with the margins. The 

 tertiaries are immersed in the leaf substance. 



This species, which is obviously new, is clearly lauraceous, 

 and appears to me to represent the genus Mespilodaphne, 

 although there is a possibility of it representing the allied 

 genus Nectandra. It is unfortunately represented by a scant 

 amount of material so that a final conclusion on this point 

 is not possible. 



There are a number of closely comparable existing forms 

 in the flora of the upper Amazon basin. The genus, although 

 represented in the modern flora of Africa, is largely Amer- 

 ican and appears to have originated in the Western Hemis- 

 phere. 



Order MYRTALES 



Family MYRTACE^E 



Genus MYRCIA De Candolle 



Myrcia pliocenica Berry, sp. nov. 



PLATE VII Figs. 3, 4 



Leaves of medium size, lanceolate in general outline, 

 slightly falcate, widest in the middle and about equally acum- 

 inate at both the apex and base. Margins entire, slightly 

 revolute. Texture coriaceous. Length 8 cm. to 9 cm. Max- 

 imum width about 1.75 cm. Midrib stout, prominent below. 

 Secondaries stout, numerous, diverging from the midrib at 

 angles of about 55 to 60 degrees, straight, their tips joined by 

 a conspicuous marginal vein close to the margins. Tertiar- 

 ies well marked on the under side of the leaf, forming an 

 inosculating and distinctly myrtaceous areolation. 



