663 
first established are derived exclusively from the ventral carotid. This: 
arrangement is seen in embryos incubated for four and one-half days 
and persists until the middle of the fifth day at which time a spur 
is developed from the dorsal vessel which gradually becoming larger 
forms an anastomosis with the ventral vessel so that, by the sixth 
day, the blood supplying the upper and lower jaw is derived from two 
sources: viz. the ventral carotid, and the anastomosing ramus from 
the dorsal carotid. The dorsal branch grows larger while the ventral 
carotid atrophies in its middle portion. After the breaking apart, the 
elongation of the neck causes the two portions to be carried apart. 
During the eighth day the posterior remnant completely disappears but 
the anterior remnant survives in the adult as a small branch from 
the external carotid. 
The development. of the carotid arteries in birds is very similar 
to the development in reptiles (crocodilia). An anastomosis being 
established, in both cases, between the ventral and dorsal vessel with 
the result that the main branches of the external carotid to the upper 
and lower jaw are derived exclusively from the ventral vessel. There 
are also broad resemblances between the process of formation in birds 
and mammals with difference in detail. There is a different phase, 
perhaps, interpolated in the development of the chick, in which those 
branches of the external carotid feeding the upper and lower jaw 
have a connection only with the ventral vessel. After the anastomosis 
with the dorsal vessel the resemblance between birds and mammals 
is very close. 
Nachdruck verboten. 
Ein vergessener Fall von interfrontaler Fontanelle. 
Der Beachtung empfohlen von A. Ravser. 
Der Beobachter des hier der Vergessenheit zu entreißenden Falles 
von interfrontaler Fontanelle des Menschen weilt schon seit Jahren nicht 
mehr unter den Lebenden. Vor kurzem lieferte mir der Zufall die 
im Jahre 1883 veröffentlichte Schrift in die Hand, welche das Vor- 
kommnis neben vielen anderen an dem gleichen Schädel vorhandenen 
Besonderheiten kurz beschreibt und in verschiedenen Ansichten trefi- 
lich abbildet; es ist die Schrift des unglücklichen PAUL ALBRECHT, 
die unter dem Titel „Sur le cräne remarquable d’une Idiote de 21 
ans“ zu Brüssel gedruckt wurde, und zwar als Communication, faite 
