73 
Literaturverzeichnis. 
Bateson, Wır.: Materials for the Study of Variation. London 1894. (Vergl. 
auch PRrzIBRAM 1909.) 
KRiZENEORY, Jar.: Uber die Einwirkung des allseitigen Druckes bei der 
Puppenentwickelung von Tenebrio molitor. Ein Beitrag zur Teratologie 
der Insekten. — (Entomologische Blätter. 8. Jahrg.) 1912. 
— Uber die Homöosis und Doppelbildungen bei Arthropoden. — (Zoolog. 
Anzeiger. Band XLII.) 1913. 
Mecusar, Fr.: Die Regeneration der Coleopteren. — (Arch. f. Entwickl.-Mech. 
d. Org. Band 25.) 1907. 
Mocaurrys, M. S.: Recueil de col&opteres anormaux. Avec introduction par 
M. J. Bourcsors. Rouen 1880. 
PrzipramM, H.: Experimentelle Zoologie. 2. Regeneration. Wien-Leipzig, 
Deuticke 1909. 
— Die Homöosis bei Arthropoden. — (Arch. f. Entwickl.-Mech. d. Org. 
Band 29.) 1910. 
TORNIER, G.: Das Entstehen von Käfermißbildungen, besonders Hyperantennie 
und Hypermelie. — (Arch. f. Entwickl.-Mech. d. Organ. Band 9.) 1900. 
Nachdruck verboten. 
On the Structure of the Mandible in the Stegocephalia. 
By ROBERT Broom, D. Sc. 
With 4 (7) Figures. 
Until recently our knowledge of the intimate structure of the 
Stegocephalian mandible has been very imperfect, and even at present 
many points are left in doubt. Branson has studied the mandibles 
of the American forms Anaschisma and Eryops, and Watson has 
given us studies of the jaws of Loxomma, Bothriceps, and Micropholis. 
Most of the more important elements have been identified, but we 
are left in much doubt concerning a considerable number of structures. 
As the matter is of much importance in linking up the homo- 
logies of the bones of the fishes with those of the higher forms, I 
have carefully examined the jaws of the principal Permo-carboniferous 
Amphibians in the collection of the American Museum. The most 
important material for the purpose is the large series of jaws of 
Trimerorachis and the jaws of Eryops. It has been possible in one 
specimen or other to trace nearly every suture with perfect certainty. 
The elements in the two genera agree very closely, and in the pre- 
