48 
the astragalus. Molars of upper jaw broad and extending into an 
externo-anterior angle; of lower jaw, narrow and continuous in a 
TOXODONTIA. 
uniform row. 
b. 3. Incisors (}) of upper jaw next to symphysis (with persistent 
pulps) long and curved; those of luwer jaw straight and nor- 
mal. Feet with inferior surfaces furnished with pads, (as in 
Rodents and Carnivores): carpal bones in two interlocking rows; 
cuneiform extending inwards, (and articulating with magnum,) 
and affording an enlarged surface of attachment forwards for the 
ulna (which is antrorsely produced); umciform and lunar separat- 
ed by the interposition of the cuneiform and magnum: hind foot 
with the astragalus at its anterior portion extended and, as a 
whole, much deflected inwards, articulating in front only with 
the navicular: toes (four to the front feet, three to the hind) with 
terminal,phalanges encased in hoofs; (inner nail of hind foot 
curved). Placenta deciduate, zonary. 
HYRACOIDEA. 
b. 4. Incisors (2, or, in extinet forms, 3 or $, renewed from per- 
sistent pulps,) developed as long tusks curved outwards. Feet 
with palmar and plantar surfaces invested in extended pad-like 
integuments, which also underlie the toes: carpal bones in two 
regular (not interlocking) rows, broad and short; cuneiform ex- 
tended inwards—broad, and furnishing an enlarged surface of 
attachment forwards for the ulna (which is antrorsely produced). 
Unciform directly in front of cuneiform, and magnum directly in 
front of lunar: hind foot with the astragalus at its anterior por- 
tion very short, (convex,) and not deflected inwards, articulating 
in front only with the navicular: toes (five to each foot, in known 
forms,) encased in broad shallow hoofs. Placenta deciduate, 
zonary.—Snout produced into a very long proboscis. Legs mostly 
exserted outside the abdominal integument; and with the proxi- 
mal and succeeding joints extensible in the same line. 
PROBOSCIDEA. 
B. Posterior members and pelvis more or less completely atrophied; the 
form of the body being fish-like, furnished with a horizontal tail, and 
specialized for progression in the water. Periotic and tyinpanie bones 
anchylosed together, but not articulated with the squamosal. 
1. Brain narrow. Skull with the foramen magnum posterior, directed 
somewhat downwards: supra-occipital nearly vertical and not ex- 
tending forwards, the parietals meeting and interposed between it and 
the frontals. Periotic with a posterior irregularly rounded part; 
tympanic annuliform. Lower jaw with well-developed ascending rami 
and normal transverse condyles and coronoid processes. Lateral teeth 
molar, and adapted to trituration of herbage. Neck moderate; second 
=. 
(IV.) 
(V.) 
(VL) 
ba 
: 
Pitta! ee 
