528 PRIMARY GROUPS OF MAMMALS. 
missure, and a supeyior transverse commissure pul SRE the 
oe more or anne rooting in ess Mtg cles: the s and heart in the 
thora th pa ee paene PEE 
aorta minea and reflected over the left beaientis: blood with red non- 
maleated blood-corpuscles undergoing a complete circulation; entirely re- 
eived and transmitted by the right half of the quadrilocular heart to the 
ungs for aeration soy thus warmed), and afterwards returned by the 
se half through the system. Skull with two condyles, chiefly devel- 
oped on the Said elements (one on each side of the foramen mag- 
ith the malleus and incus superadded as specialized auditory 
rami) a 
ped as hai ev T 
minute egg: young nourished a birth 2 a fuid a secreted in pe- 
culiar glands (mammary) by the mother. 
SUB-CLASS MONODELPHIA, 
Brain with the cerebral hemispheres connected by a more or less well- 
developed corpus Sonate composed of a body as well as a folded psal- 
` terial pai and a reduced anterior commissure; with a well pbs! 
ay Sternum ik no element in front of the manubrium or prester- 
Coracoid not connected with the sternum, but early satoi 
<i and developed as a simple process of the scapula. Oviducts de- 
bouching into a single vagina. Testes variable in position, but the vasa 
deferentia open directly or indirectly into a distinct and complete uretha, 
(and not into a cloacal cavity). Ureters discharge directly into the blad- 
der the renal secretion, which thence passes into the uretha. Mammary 
oo epee from the allantois) till birth. Scrotum never in front of 
penis 
Super-Order Educabilia. 
Brain with a relatively large cerebrum, behind overlapping much or 
all of the cerebellum, and in front much or all of the olfactory lobes; 
corpus callosum (attypically) continued horizontally backwards to or be- 
yond the vertical of the hippocampal sulcus, developing in front a well- 
defined recurved rostrum. 
(EDUCABILIA QUADRIPEDIA.) 
Posterior members and pelvis well developed. Periotic and tympanic 
bones articulated with the squamosal. 
(Primate Series.) 
I. ORDER PRIMATES. 
embers almost or entirely exserted outside of the common abdominal 
reas. Digits with corneous appendages developed as claws (i. €. 
