412 E. A. BAUMGARTNER 
— 
Mo 
NS 
=~ 
\ ‘ 
< 
e 
@ 
¢ 
Fig. 14 Left lateral view of a reconstruction of the hypophysis of a 28 mm. 
embryo. X 100. a, p, anterior and posterior extremities of anterior lobe; 
IL, inferior lobe;m, middle part of anterior lobe; Mo, wall of mouth; St, hypophys- 
eal stalk; SZ, anlage of superior lobe. 
3. Later development of the hypophysis 
All the main outpouchings of the hypophysis are present in 
the 28 mm. embryo. The inferior lobes are quite prominently 
marked off, the anterior lobe shows two widened extremities 
and the superior lobe has just begun to evaginate. The anterior 
end of the hypophysis in a 33 mm. embryo is curved slightly 
forward. The anterior lobe is not so markedly concave antero- 
posteriorly as in earlier stages (fig. 7). The ventral (anterior) 
furrows separating the inferior lobes from the posterior medial 
portion, are now quite deep (fig. 15). On the caudal side a dis- 
tinct ridge extending between the inferior lobes indicates their 
