47 
the genera Mezoncurum and Lonchocarpus (including Derns and 
Pongamia), which are of tropical or southern distribution and are 
not now known north of Mexico. The first named genus is not 
€ven reported from any part of the American continent, but is 
confined to tropical Asia and Africa, with a single species (JZ. 
brachycarpum Benth.) in Australia. The genus Lonchocarpus oc- 
curs in South America, Africa, Asia and Australia. The sub- 
genus Poxgamia is confined to Asia and Australia. 
In the fossil state the species thus far described and figured in 
these genera are few and more or less unsatisfactory. 
In Mezoneurum four have been recognized, viz. : 
1. Mezoneurum Radobojanum Ung. Syll. Plant. Foss. Part 2, 
28. pl. rr. fig r. 
2. M. lygodioides Ung. Denksch. Wien Akad. 11: 172. pl. 8. 
Jig. 18. 1856, 
3. M. tripos Ung. 1. c. 173. pl. 8. fig. 19. 
4. WW. dimidiatum Wat. Plant. Foss. Bass. Paris, 244. pd. 60. 
Jig. 10, 
Of these the first and last mentioned are pods. The others 
are mere problematic organisms of but little value in this connec- 
tion. All are from Tertiary strata in Europe. 
In the genus Lonchocarpus two fossil forms have been recog- 
nized, viz: 
1. Lonchocarpus latifolius Kth., a living species, reported from 
the Pleistocene (?) strata of Chorillo, Cuba, by P. P. Galtés, in a 
work entitled, « Memoria sobre unos fossiles vegetales encontrados 2 
€n el Chorillo.” * j 
2. L. obtusifolius Engelh. Abh. Isis, 1894.7. p/. 2. fig. 22; Abh. 
Senckb. Naturforsch. Gesellsch. 19: 17. pl. 3. fig. 1. 1895; leaves 
from Tertiary strata in South America. ee 
The only fossil representative of the subgenus Pongamia to — : 
which I have been able to obtain any reference is P.{ protogaea _ 
Massalongo, Neu. Jahrb. Min. 1857, 778, where it is mentioned in — 
a list of plants from the Tertiary strata of Monte Bolca, Italy: fe. 
Was subsequently described in Atti Reale Inst. Veneto di Sci. 
* This reference was given me by Professor Lester F. Ward, of the United States : a 
Geological Survey, but neither of us has had access to the wok, and * 4 ~o a a 
= ‘Whether the fossil was a pod or a leaf. ee 
eo, 1 Spelled: Aenpanfe. 0) oj 
