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



occurrence of closely affined forms in the most nearly approximated regions of West 

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

 adjacent parts 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 

 Hemisphere, 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 OP PLATE 25. 



Piof. 1. Thoropa missiesii Bibr., Eio Janeiro. Anterior part of cranium above. 



2. Ghorophilus oculatus Baud. [Cystignathus ornatus Gthr., not C. oculatus Holbr.) a. premaxillaries ; 



6, maxillaries ; c, prefrontals ; d, ethmoid ; e, frontoparietal ; /, quadratam ; g, proiitic ; h. exoccipital. 

 From Georgia. 



3. Scytopis venulosus Baud., Brazil. 



4. Smilisca baudinii D. ^ B.. Mexico : g, anterior and posterior terminal phulanges. 



5. Hyla palmata, Brazil-, 



6. Agalychnis moreletii, Guatimala. 



7 — 8. Triprion petasatus m., Yucatan. 

 9. Scaphiopus solitarius, Georgia. 

 10 — 11. Discoglossus pictus, Greece : a, arched cartilage ; 6, acromial ; c, coracoid ; d, xiphisternal ; e, ribs ; 

 /, coccygeal diapophyses. ' 



12. Pelobates fuscus, 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. Enhydrobius vomerirms, Rio Janeiro. 



21. Lithodytes oxyrhynchus, West ladies. 



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



