32 
left side* w ioh is in advice of the right in development• Ifee 
cavity of the ostium extends forward pa^t ito opening into the 
coelosic cavity as a pocket with wrinkled walls and the coelom 
lining is al c t ickened for a short di ta~cs in that direction. 
The total length of the duct on the left side ia 83d cdcra, on 
the right » 374 siora. 
At !•? on. the oooIcib epithelium anterior to the o tiun 
thickens raark dly on both aides. Then cn tracing the sections 
caudally, a fimbriated slit froa the cooloraic epithelium leads 
into the interior of the flat duct, at about the eaae level on 
both aides, lined with taller columnar cells and lying ventro¬ 
medial to the Wolffian duct. This ends posteriorly an before in 
a cord on the ventral wall of he Wolffian duct. Left «ide is 
855 micro and the ri*ht is 705 ricra long. 
At 2.0 os. the ostia are attached to the diaphragm and the 
ducta have lamina for some di :tanc*. the left being greater as 
before. 
At 2.4. 2.5. and 2.7 cn. the ducts show increase in length 
in which the left is in ^dvanoe of the right. Ho such difference 
between the sexes in the setter of one or two ridges for the 
Wolffian and dfcllerian ducts, as ic described by Felix (*12) for 
the huimn enfcryo. is found in this carles for cattle. The ostium 
is farther forward on the right side than on the left due to the 
backward migration of the mesonephros as described by Ber*scbickor 
(*12). The ducts do not reach the sinus in these stages. 
In females:- At 2.8 cm. (Fig. 3) neither right nor left duct 
has reached the sinus tho gh the left has got as far bock as the 
opening of the Wolffian duct to it. Lunina are present 1 1 rcughout 
their length. So separate Ufllerian duct ridge is prose t in the 
fe-aale of thin stage. 
