Fig. 8. 
Grooving and closing in of the groove occur as already described 
(Figs. 5—8). 
The next stage I have examined is found in a specimen (D) 
19 mm in length. Here as in C there is a distinct band-like thicken- 
ing of the epithelium of the diverticulum of the coelom. Anterior to 
the mesonephros this spreads out laterally, and at once forms the 
anterior end of the Müllerian duct. Even in front of the mesonephros 
we see the Anlage projecting freely into the coelom on its pedestal 
derived from the lateral body wall. Further. back the Anlage is 
found as in the other specimens united with the mesonephros. 
