STAGE 65. Age +/- 54 d.

Ext. Crit.: Border lines between adult skin areas partly disappeared. *Tail oblong trianglular in dorsal aspect, lengh about 1/10 of body length*.

Int. Crit.: Only small area of strongly shrivelled larval skin present rostral to forelimb. *Spinal gangl. 8 situated at posterior end of lumbar area of spinal cord*.

*Fusion of adult proc. oticus with ear capsule; beginning of ossification in pars media, and beginning of chondrification in pars externa plectri*. *Intervertebral joints formed; 13th and 14^th pair of vertebral arches in process of resorption. *Notochord and somites disappear in tail region*. *Posterior end of epipubis fused with pelvic girdle*. *Adult abdominal vein established*.
Primitive tongue mushroom-shaped in cross section; cranial part forming free tip; openings and proximal portions of pharyngo-tympanic ducts fused*. *Epithelium of colon differentiating*.