112 STRUCTURES ETC. OF THE GENERA OF THE ARCIFEROUS ANURA. 



occurrence of closely affined forms in the most nearlj' approximated regions of West 

 Africa and South America; third, the appearance of similar forms in the most 

 adjacent jjarts of South America and Australia. 



Finally, as Guyot* points out that the races of man are inferior as we reach the 

 southern extremities of the continents which are prolonged into the great Water 

 Plemisphere, so it can be shown that these extremities produce the greater number of 

 "degraded" or "undeveloped" genera of Batrachia Anura, as indicated by the con- 

 dition of their cranial bones, sternum, etc. 



* Earth and Man. 



EXPLANATION OF PLATE 25. 



Fig. 1- Thoropa niissiesii Bibr., Rio Janeiro. Anterior part of cranium above. 



2. Chorophilus oculatus Daud. [Cystignathus omatixs Gthr., not C. ocidatus Holbr.) a, prema.xillaries ; 



b, maxillaries ; c, prefrontals ; d, ethmoid ; e, frontoparietal ; /, quadrattim ; g. proiJtic ; h. exoccipital. 

 From Georgia. 



3. Scytopis yenulosus Daud., Brazil. 



4. Srailisca baudinii D. If B.. Mexico : g, anterior and posterior terminal phalanges. 



5. Hyla palmata, Brazil, 



6. Agalychnis moreletii, Guatimala. 



7 — 8. Triprion petasatus m., Yucatan. 

 9. Scaphiopus solitarius, Georgia. 

 10 — 11. Discoglossns pictns, Greece : a, arched cartilage ; b, acromial ; f, coraeoid ; d, xiphisternal ; e, ribs ; 

 /, coccygeal diapophyses. 



12. Pelobates fuscns, Austria. 



13. Megalophrys montanus, Java. / 



14. Chiroleptes australis, New S. 



15. Gnathophysa ocellata, Surinam. 



16. Pithecopus fuliginosus, Brazil. 



17. Borborocaetes peronii, Australia. 



18. Hylorhina aenea, Chili. 



19. Phyllobates bicolor, Cuba. 



20. Bnhydrobius vomerinus, Rio Janeiro. 



21. Lithodytes oxyrhynohus, West Indies 



22. Zaphrissa eurypelis m., sp. nov. Fossil. * 



