24 



^^m 



HK 



k" dorsal 



Fig. 6 

 Map of the presumptive regions of the Anuran embryo, projected onto the surface 

 of the blastula, as seen from the dorsal and left sides. Epidermis, sparse broken 

 lines; neural plate, dense broken lines; notochord, dense dots; mesoderm, fine 

 dots; endoderm, white. The future mesodermal segments are numbered. 

 A, eyes ; «P, animal pole ; Eg,r, limit of invaginated region ; Ex, epidermis of limb 

 region ; Hhl, ear vesicle ; Hd, ventral sucker ; J, site of formation of first invagina- 

 tion (dorsal lip); K, gill-pouches, and epidermis of gill region; Kgr, broken line 

 indicating limits of head ; L, lens ; Met', neural fold ; U, position of future blasto- 

 pore lip; VEx, forelimb; vP, vegetative pole. Kopjdarm, foregut; Mxmd, buccal 

 cavity; Riimpfdarvi, hindgut. (From Vogt, Arch. Entzanech. cxx, 1929.) 



