246 E. A. BATJMGARTNER 



In the snakes studied the lateral buds do not persist. Young 

 embryos of Eutaenia sirtalis and Tropidonotus natrix show well- 

 defined but not distinctly separated lateral buds. A Tropidonotus 

 12 mm. long (diameter of coils) shows only a questionable bud, 

 while in 10 and 12 cm. embryos the lateral buds have entirely 

 disappeared as is the case in adult garter snakes. They are not 

 present in adult adders. Tilney ('11) apparently saw no tongue- 

 like process in Eutaenia sirtalis. 



Briefly, then, the lateral buds persist and form a parstuberalis 

 and cortical zone about the anterior lobe in turtles (Aromochelys 

 odorata and Chrysemys marginata); a tongue-like process and 

 spiral band around the anterior lobe in alligators; a pars ter- 

 minalis in Sphenodon (Gisi '07) ; disappear in lizards and snakes 

 except in Gongylus (Staderini '05 and Bruni '14), Chamaeleon 

 (Gisi '07) and possibly Lacerta agilis and Anguis fragilis (Gaupp 

 '93). 



The third outpouching from the oral roof, Gaupp's Vordere 

 Knospe' together with the ventral part of Rathke's pouch, gives 

 rise to the adult anterior lobe, with the exception of its cortical 

 layer in turtles and alligators. I can see no reason for dividing 

 the anterior evagination in reptiles into 'Vorraum und Mittel- 

 raum' as Woerdemann ('13) has done. 



The shape of the anterior lobe in adult reptiles is shown in the 

 drawings of median sagittal sections (figs. 45-48). In turtles 

 its length is about three times its depth. Gisi's ('07) measure- 

 ments for Emys lutaria are four to one. In alligators and 

 snakes, it is about two to one and in lizards about three to one. 

 In snakes the anterior lobe lies somewhat lateral to the infun- 

 dibular outgrowth, so that a median sagittal section of the brain 

 does not show the greatest depth of the anterior lobe. The 

 pars intermedia in the forms studied is a thin layer interposed 

 between the infundibular outgrowth and the anterior lobe. The 

 latter, in snakes and alligators, lies against the curved, ventral 

 surface of the pars intermedia, and in snakes, alligators, and 

 some turtles, it extends dorsally over the sides and caudal end 

 of the infundibulum. Herring ('13) figures this part in Testudo 

 graeca as extending forward from between the pars nervosa and 



