L'SEl'M. 



THE BATRACHIA OF NORTH AMERICA. 



515 



Parker's Slriitiure 

 t l-'ii;. 18 which js 

 ijjc'.s Osteohijrif ct i 

 Parker /. c. 



ies of Aiuiras. 



om drawings by 



May 15, 'J a. in. 



f 



oj^ie et Myolojjii' | 



; 8d, iiictacar|iii- 

 to-ratlio-siilipiia- 

 iuilfx : l".il, siili- 

 . ."> and H aro (li>- 

 ml 11, tliL' (li-cj)! 1 ^ 



in tho nunilii IS 

 lermetatarsals of , 



r 



Figs. 1-19. nyla pickeringii — Coutiuutil. 

 «). Side view of tho same. 

 7. A more advanced embryo. 

 ri. Side viewof the Name. 



y. Embryo still farther advanced, May 16, 4 p. ni. Fig. a, side view 

 of the same. 



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



thenLsclves in meridians, May IG, 4 p.m. Laid abimt 10 a. m.. 

 May l.">. 



11. Embryo on May 17, 10 a. m.; rotation couimeneed ; Fig. (/, profile. 



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



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



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



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



ments. 



16. The same ; head from front. 



17. May l.**, 9 a. m., liberated artificially and swimming. 



18. The same ; front and below. 

 li». May l-i, ;!.:W p. m. 



•20. Tadpole, anterior part. 



21. Eyo of same in jirofile. 



22. Hrain and spinal cord of tadpole. 

 2l}-2(). Iljila ? versicolor. 



23. Embryo in albumen, April 9. 



24. Embryo, just before liberation. 



25. Embryo Just after liberation : branchial circulatiou distinct. 

 20. Head of the same from below : diagram. 



PLATE LXXIX. 



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



enlarged. From \V. K. Parker. 



The arches are : tho trabecular (in dotted outline), the mandibular, and the cerati 

 hyal. The successive stages of the ossienla anditns are exhibited also. 

 For explanations of details, see Plates XLVIII to L. 



PLATE LXXX (cancelled). 

 PLATE LXXXI (cancelled). 

 PLATE LXXXII (cancelled). 



PLATE LXXXin. 



Fio. 1. llyla andertionii Baird ; natural size. 

 2. Ilyla ijratioM Le Conte ; natural size. 

 :?. Do. ; mouth, within. 



4. Do. : hand. 



5. Do. ; foot. 



J 



hi 



^V\ 



PLATE LXXXI V (cancelled). 



?rminal area, 

 euiugof May 14. 



PLATE LXXXV (cancelled). 

 PLATE LXXXVI. 



Rana septenlrionalis Baird, var. sinuata Baird ; natural size. 



n-ii 



