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scapula, coracoid and epicoracoid which are closely united. Pelvic 
arch consisting of the usual three elements, which are united through- 
out; closing the obturator foramen and acetabulum. Limbs with the 
phalanges as in the ambulatory types. Quadrate bone proximally 
united by suture with the adjacent elements. No quadratojugal arch. 
Pelycosauria. Two or three sacral vertebrae; centra noto- 
chordal; intercentra usually present. Dentition full. 
Anomodontia. Four or five sacral vertebrae; centra not noto- 
chordal; no intercentra. Dentition very imperfect or wanting. 
The Rhynchocephalia have no distal ischio-pubic symphysis, 
and apparently no epicoracoid bone. They have an obturator foramen, 
and a quadratojugal arch. 
The order Theromorpha was regarded by Prof. CopeE as ap- 
proximating the Mammalia more closely than any other division of 
the Reptilia, and as probably the ancestral group from which the 
latter were derived.“ 
On 1884 Prof. Cope!) was fully convinced that „the Mam- 
malia are the descendants of the Pelycosauria“. 
The order Theromora has been admitted by nearly all Palae- 
ontologists and Zoologists, and the opinion of the close relationship 
of this group with the Mammalia has found very many supporters. 
In 1886 Baur?) published a paper „Ueber die Kanäle im Hu- 
merus der Amnioten‘“ in which he stated, that the Theromora were 
too much specialized, to be the ancestors of Mammals. To the 
hypothetical group which gave origin to the Theromora and Mam- 
mals he gave the name Sauro-Mammalia. 
On March 8th 1887 Baur?) read a paper „Ueber die Abstam- 
mung der amnioten Wirbeltiere“ before the „Gesellschaft für Mor- 
1) E. D. Core, Fifth Contribution to the Knowledge of the Fauna 
of the Permian Formation of Texas and the Indian Territory. (Read 
before the American Philos. Soc., August 15, 1884. Printed Nov. 20. 1884; 
also Palaeontological Bulletin, No. 39, p. 43—46.) — The Relations be- 
tween the Theromorphous Reptiles and the Monotreme Mammalia. Proc. 
Americ. Assoc, Adv. Science, Vol. XXXIII, Philadelphia Meet., Sept. 1884, 
Salem Mass., 1885, p. 471—482. 
2) G. Baur, Ueber die Kanäle im Humerus der Amnioten. Morphol. 
Jahrbuch, 1886, p. 299—305. 
3) G. Baur, Ueber die Abstammung der amnioten Wirbeltiere. 
Sitzungsber. d. Gesellschaft f. Morphologie und Physiol. München, 1887, 
p- 44—61; also Biol. Centralblatt, Bd. VII, 1887, p. 481—493. — On 
the phylogenetic Arrangement of the Sauropsida. Journ. Morphol., Vol. I, 
1887, p. 93—104. 
