THE BATEACHIA OF NORTH AMERICA. 515 



Figs. 1-19. Hylapiclceringii— Continued. 



6. Side view of the same. 



7. A more advanced embryo. 



8. Side view of the same. 



9. Embryo still farther advanced, May 16, 4 p. m. Fig. a, side view 



of the same. 



10. Vitellus of elongate form, with brown polygonal spots arranging 



themselves in meridians, May 16, 4 p.m. Laid about 10 a. m., 

 May 15. 



11. Embryo on May 17, 10 a. m.; rotation commenced; Fig. a, profile. 



12. Embryo May 17, 11 a. m. ; a, profile. 



13. Embryo May 17, 4 p. m., straightened out. 



14. Embryo May 17, 4 p. m., profile. 



15. Embryo May 17, 5 p. m., profile enlarged, displaying ciliary move- 



ments. 



16. The same ; head from front. 



17. May 18, 9 a. m., liberated artificially and swimming. 



18. The same ; front and below. 



19. May 18, 3.30 p. m. 



20. Tadpole, anterior part. 



21. Eye of same in profile. 



22. Brain and spinal cord of tadpole. 

 23-26. Hyla f versicolor. 



23. Embryo in albumen, April 9. 



24. Embryo just before liberation. 



25. Embryo just after liberation ; branchial circulation distinct. 



26. Head of the same from below ; diagram. 



PLATE LXXIX. 



Development of the three anterior inferior cranial arches of the genus Eana ; much 

 enlarged. From W. K. Parker. 



The arches are: the trabecular (in dotted outline), the mandibular, and the cerato- 

 hyal. The successive stages of the ossicula auditus are exhibited also. 

 For explanations of details, see Plates XLVIII to L. 



PLATE LXXX (cancelled). 

 PLATE LXXXI (cancelled). 

 PLATE LXXXII (cancelled). 



PLATE LXXXIII. 



Fig. 1. Hyla andersonii Baird ; natural size. 



2. Hyla gratiosa Le Conte ; natural size. 



3. Do. ; mouth, within. 



4. Do. ; hand. 



5. Do. ; foot. 



PLATE LXXXIV (cancelled). 

 PLATE LXXXV (canceUed). 

 PLATE LXXXVI. 

 Batia septentrionalis Baird, var. simiata Baird ; natural size. 



