ART. 22 TERTIARY FOSSIL PLANTS PROM ARGENTINA BERRY 19 



LEGUMINOSITES species 



Plate 3, Figure 17 



Leaflet small, inequilaterally subelliptical, with about equally- 

 rounded apex and base. Margins entire. Length about 9.5 milli- 

 meters. Maximum width, above the middle, about 3.5 millimeters. 

 Petiolule stout, curved, about 1 millimeter in length. Midvein not 

 prominent. Balance of venation obscure. This obviously represents 

 some member of the Leguminous alliance, but it affords no reliable 

 generic features, and is therefore referred to the form genus 

 Leguminosites. 



Occv/n^ence. — Southeast side of Rio Nirihuao, 150 yards southwest 

 of Casa Piedra, about 12 miles south of Lago Nahuel Huapi, Terri- 

 tory of Rio Negro. 



Cat. No. 37866, U.S.N.M. 



Order SAPINDALES 



Family ANACARDIACEAE 



Genus ANACARDITES Saporta (?) 



ANACARDITES (?) PATAGONICUS, new species 

 Plate 5, Figure 1 



This is one of those leaves that is not especially characteristic. 

 Its sessile base and slightly falcate outline suggest that it may repre- 

 sent a leaflet of a pinnate leaf. I identify it with considerable hesi- 

 tation as a leaflet of some member of the Anacardiaceae which 

 contains several South American genera similar to the fossil. 



Medium-sized, ovate-falcate in outline, widest medianly, with an 

 acute tip and a slightly inequilateral more narrowed, sessile base. 

 Margins entire. Texture subcoriaceous. Length about 6.5 centi- 

 meters. Maximum width about 1.T5 centimeters. Midvein stout, 

 prominent and curved. Secondaries thin, numerous, subparallel, 

 camptodrome. 



The generic name used was proposed by Saporta for leaflets of 

 this family whose generic assignation was uncertain. A score of 

 species have been described from the Tertiary of North America and 

 Europe. Fossil species in South America have been found in Trini- 

 dad and Brazil. 



Occm-rence.—'^oviih&d.^t side of Rio Nirihuao. 150 yards southwest 

 of Casa Piedra, about 12 miles south of Lago Nahuel Huapi, Terri- 

 tory of Rio Negro. 



Holotype.—C2it. No. 3786T, U.S.N.M. 



