DEVELOPMENT OF THE HYPOPHYSIS 415 
the anterior lobe (fig. 16). The furrows separating the inferior 
lobes from the anterior are much deeper and wider. The in- 
ferior lobes have enlarged in their dorso-ventral and in their 
transverse diameters, and they extend laterally beyond the pos- 
terior extremity of the anterior lobe. Marked development 
has taken place in the superior lobe. The lateral furrows sepa- 
rating it from the anterior one are deeper, and the cranio-caudal 
length of the lobe has increased so that there is a projection cau- 
dally beyond the anterior lobe. The antero-lateral ends of the 
superior lobe have grown forward. 
The median connection of the inferior lobes is constricted from 
the posterior (ventral) part of the anterior lobe in a 50 mm. 
embryo. The inferior lobes are directly ventral to the superior 
lobe. There remains a short slender tube in the mid-line con- 
necting the inferior lobes to the anterior (fig. 9). The duct 
connecting them to the anterior lobe extends almost straight 
anteriorly. 
A median sagittal section of an 86 mm. embryo (fig. 27, G) 
shows an increase in the length of the hypophysis. The inferior 
lobes lie more caudally and the duct joining them to the anterior 
lobe is longer. 
In a 95 mm. embryo the anterior lobe has increased greatly 
in length (fig. 17). A median ventral sulcus has appeared and 
the anterior third of this lobe is quite wide. A middle narrow 
portion, almost circular in cross section, connects the anterior 
extremity to a wider posterior end (fig. 24). The caudal extrem- 
ity is connected dorsally with the superior lobe. The inferior 
lobes are continuous across the median line. The connection 
between the inferior lobes and the anterior one is a small tube 
which extends almost straight forward to join the inferior sur- 
face of the caudal end of the anterior lobe just below where this 
opens into the superior one (fig. 10). The inferior lobes have 
enlarged in their cranio-caudal axis. The lateral parts of the 
superior lobe have increased in their cranio-caudal diameters 
and extend forward beyond the median part. The latter has 
grown caudalward and lies just dorsal to the tube joining the 
inferior and anterior lobes. 
