46 
Vagina more or less completely dividing into two Separate passages. 
Young born when of very small size and imperfect development; never 
connected by a placenta with the mother, but when born attached by 
her to the nipple, from which the milk is forced by herself into the 
mouth of the young. Scrotum in front of penis. 
DIDELPHIA. (II.) 
II. Brain with the superior transverse commissure with no well defined 
psalterial fibres ; and with the septum very much reduced in Size. (Flower). 
Sternum with a peculiar T-shaped bone (the episternum or interclavicle) 
in advance of the manubrium or presternum. Coracoid extending from 
the clavicle to the sternum, and only towards maturity anchylosed with 
the scapula. The oviducts, enlarged below into uterine pouches, but open- 
ing separately from one another, as in Oviparous vertebrates, debouch, 
not into a distinct vagina, but into a cloacal chamber, common to the 
urinary and genital products, and to the feces. Testes abdominal in posi- 
tion throughout life, and the vasa deferentia open into the cloaca, and not 
into a distinct urethral passage. Ureters pour the renal secretion, not 
into the bladder, which is connected with the upper extremity of the cloaca, 
but into the latter cavity itself, Mammary glands with no distinct nip- 
fey” ORNITHODELPHIA. (III.) 
I. MONODELPHIA 
ORDERS. : 
I. 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 beyond 
the vertical of the hippocampal sulcus, developing in front a well-defined 
recurved rostrum. 
SUPER-ORDER EDUCABILIA., 
A. Posterior members and pelvis well developed. Periotic and tympanic 
bones articulated with the squamosal ; (etypically, free and otherwise 
modified, e. g. Lapiridae), 
1. Legs almost or entire] exserted ‘outside of the common abdominal 
§ vi 
integument. First digit (great toe) of hind foot (pes) enlarged, op- 
posable to the others, (exceptionally resuming parallelism with them,) 
furnished with a nail. Brain with a well-developed calearine sulcus, 
giving rise toa hippocampus minor within the posterior cornu of the 
ventricle by which the posterior lobe of the cerebrum is traversed. 
(Flower.) (Incisors fourin each jaw; etypically, two—or all in upper 
jaw—suppressed. Clavicles completely developed.) 
~ atl 
