102 STUDIES IN GEOLOGY, No. i 



about 4 mm. in diameter. Pod tardily, if at all, dehiscent ; 

 its surface minutely wrinkled. 



The present species is somewhat smaller than the normal 

 size of the pods in the existing species which I have seen, 

 and it is also smaller than those of the described fossil 

 species. It may represent the fruit of the same tree as 

 the leaflets from Potosi described as Copaifera potosiana 

 since it occurs also at Potosi in association with the latter. 



The genus is present in the recent flora of South America 

 from the Caribbean region throughout the Amazon Basin 

 and several species are known from the Yungas region of 

 Bolivia. 



Genus Peltophorum VOGEI, 

 Peltophorum membranaceum ENGEXHARDT 



Peltophorum membranaceum Engelhardt, Sitz. Naturw. Gesell. 

 Isis in Dresden, 1894, Abh. i, p. 9, pi. i, fig. 47. 

 Berry, Proc. U. S. Natl. Mus., vol. 54, p. 145, pi. 17, fig. 3, 1917. 



Description. Leaflets small, sessile, inequilateral, ovate 

 in general outline, with a bluntly pointed apex and an 

 obliquely cuneate base. Margins entire. Length, about 

 8 mm. Maximum width, in the middle part, about 3.5 

 mm., one side one-third wider than the other. Midrib 

 mediumly stout, curved proximad. Secondaries thin, about 

 tlire,e ascending; camptodrome pairs. 



This species was described from Potosi by Engelhardt, 

 and was collected in 1919 from both Corocoro and Potosi. 

 The peculiar outline serves to readily distinguish it from 

 the other members of the flora. It has been compared 

 with the existing Peltophorum vogelianum Bentham of 

 the Brazilian region. 



The genus Peltophorum, not otherwise known in the 

 fossil state, comprises about eight species of trees common 

 to the tropics of both hemispheres. Its distribution in the 

 existing flora of eastern Bolivia is unknown. 



