A16 JORDAN AND EYCLESHYMER. 
PLATE XXVI. 
In all the figures the continuous é/ack lines represent the /irs¢ cleavage plane, 
the broken lines the second, the blue the third, the red the fourth, the dotted lines 
the ft. In most cases the precise time at which each furrow appeared is 
recorded on the figure. 
Fics. I-10 represent eggs of Rana; Figs. 11-15, Bufo; Figs. 16-24, Diemyc- 
tylus ; Figs. 25-33, Amélystoma. 
Fics. 1-4 represent successive stages of one egg viewed from the upper pole. 
Fics. 5 and 10, respectively, top and bottom views of one egg. 
Fics. 6 and 7, successive stages of one egg from upper pole. 
Fic. 8. Upper pole; fourth set of cleavage planes just appeared. 
Fic. 9. Upper pole; fourth set of cleavage planes just appeared. 
Fics. 11-13. Successive stages of one egg ; upper pole. 
Fic. 14. Lower pole of egg shown in Fig. 13. 
Fic. 15. Upper pole showing conformity to diagram type of cleavage. 
Fics. 16-19. Successive stages of cleavage of one egg showing remarkable 
irregularity. A normal embryo was formed from this egg ! 
Fic. 20. Upper pole showing great distortion of first cleavage planes. 
Fics. 21-24. Successive stages of one egg ; upper pole. 
Fics. 25-28. Successive stages of one egg; upper pole. 
Fics. 29-32. Successive stages of one egg ; upper pole. 
Fic. 33. The central figure represents the upper pole of the egg, the surround- 
ing figures are side views of the same egg. ‘To each furrow is affixed a recogni- 
tion number. 
