NO. 2229. FOSSIL PLANTS FROM BOLIVIA— BERRY. 143 



leaflets suggest a variety of existing Leguminosae and might with 

 equal propriety be referred to the form genus Mimosites of the 

 Mimosaceae. I have been influenced in referring them to Caesal- 

 pinites by the great abundance of Caesalpiniaceae in the Potosi 

 flora and by their equal predominance in the existmg flora of the 

 Amazon Basin, with which the Potosi flora shows so much similarity 

 and from which it appears to have been derived. 



There are a number of other species in the Potosi flora that greatly 

 resemble the present one. Among these I might mention the super- 

 ficially identical CalUandra obliqua Engeihardt, which, however, is 

 more pointed, sessile, with a very obliquely inequilateral base and 

 several digitate primaries. Mimosa arcuatijolia Engeihardt is 

 identical in form but smaller and sessile. Enterolobium parvifolium 

 Engeihardt is larger, relatively narrower, more elongate, more pointed 

 at both ends and prevailingly falcate. Macliaerium eriocarpoides 

 Engeihardt is larger and stouter, more pointed at both ends, and 

 with a weU-marked secondary venation. Enterolobium grandi- 

 folium Engeihardt is also much larger and stouter, more lanceolate, 

 S3ssile, and very inequilateral, so that there is no doubt that Caesal- 

 pinites potosianus represents a distinct leguminous species. 



Holotype.— Cat. No. 35100, U.S.N.M. 



Genus COPAIFERA Linnaeus. 



COPAIFERA POTOSIANA, new species. 



Plate 16, fig. 17. 



Description. — Leaflets sessile, inequilaterally trapezoidal in out- 

 Ime, bluntly pointed at both ends. Length, about 1.75 cm. 

 Maximum width, midway between the apex and the base, about 

 8 mm. Margins entire. Texture coriaceous. Midrib stout, curved, 

 prominent on the lower surface of the leaflets. Secondaries numer- 

 ous, thin, mostly immersed, ascending, camptodrome. Tertiaries 

 obsolete by immersion. 



The present species is somewhat suggestive of Pithecolohium as 

 well as some of the smaller leafed species of Inga, as, for example, 

 Inga trapezijolia De CandoUe, but the venation is somewhat different. 

 The fossil leaflets, which are not uncommon at Potosi, are similar to 

 those of the existing Copai^era trapezijolia Hayne, and are not unlike 

 those of Copai^era langsdorffii Desfontaines of the Amazon basin, 

 which is recorded from near Mapiri, Bolivia. 



The genus Copai^era comprises about 16 existing species of the 

 equatorial region of Africa and America, ranging from the West 

 Indies to the Amazon basin in the latter region. Four of the species 

 are African and the balance are American. A niunber of fossil 

 species, ba,sed for the most part upon the characteristic pods, have 



