PLIOCENE PISLLYPAMPA BOLIVIA 173 



courses, and abruptly camptodrome close to the margins. 

 The tertiaries are immersed in the leaf substance. 



Among existing species seen the present fossil is most like 

 Anona acutiflora Martius of eastern Brazil, but this is without 

 especial significance. The genus is large and is at present 

 confined almost exclusively to tropical and subtropical Amer- 

 ica. The Chirimoya in numerous varieties is widespread in 

 cultivation both in the montana country and in the deeper 

 inter-Andean valleys of Peru and Bolivia. I have seen it in 

 gardens, as near Araca, Bolivia, at altitudes of 10,725 feet. 

 Weberbauer gives its upper limit in Peru as 5,850 feet, which 

 seems to me to be too low. There are other species of Anona 

 in the Bolivian Yungas at present as in the past. It is rather 

 curious that the characteristic seeds have not been preserved 

 with the other forest litter at Pisllypampa. The present 

 species is unfortunately represented by a scanty amount of 

 material. 



Order ROSALES 



Family MIMOSACE^ 



Genus PITHECOLOBIUM Martius 



Pithccolobium palcanum Berry, sp. nov. 



PLATE VI Figs. 7, 8 



Leaflets sessile, nearly equilateral and broadly obovate in 

 outline, with a rounded apex and a cuneate base. Margins 

 entire, evenly rounded. Texture sub-coriaceous. Length 

 about 3 cm. Maximum width, in the median region of the 

 leaflet, about 1.5 cm. Midrib stout, prominent on the lower 

 surface of the leaflet, slightly curved. Secondaries stout, 

 largely immersed in the leaf substance; they are somewhat 

 irregularly spaced, diverge from the midrib at angles of 45 

 degrees or slightly more, are relatively straight except in the 

 marginal region, where they are camptodrome. What is dis- 

 cernable of the tertiary areolation is shown in the accompa- 

 nying sketch twic natural size. 



