SKELETON OF PHORORHACOS INFLATUS. 85 
change, while the smaller more generalized Cariama and Chunga, or rather their 
ancestors, survived. In fact, it appears that Phororhacos stands in somewhat the same 
relation to the Cariamide that such forms as Glyptodon and Panochthus stand to the 
modern Armadillos. 
All the specimens described are from the Santa Cruz Beds of Monte Observacion, 
Patagonia. The age of these deposits is doubtful, but they probably correspond to 
some part of the Miocene of the Northern Hemisphere. 
EXPLANATION OF THE PLATES. 
PLATE XIV. 
Skull and mandible of Phororhacos inflatus Amegh., p. 56. From side. % nat. size. 
PLATE XV. 
Skull of Phororhacos inflatus Amegh., p. 56. 
Fig. 1. From below. 3 nat. size. Fig. 2. From above. @ nat. size. 
tpt. Process of pterygoid articulating 0.q. Orbital process of quadrate, p. 63. 
with base of the skull, p. 57. pal. Palatine, p. 62. 
b.¢. Basitemporal platform, p. 57. pe.f. Precondylar fossa, p. 57. 
eth. Ethmoid (?), p. 60. p.mx. Premaxilla, p. 61. 
if. Facet for inner head of quadrate, p.orb.p. Postorbital process, p. 58. 
p- 58. pt. Pterygoid, p. 62. 
i.0.s. Interorbital septum, p. 59. g. Quadrate, p. 62. 
lac. Lacrymal, p. 58. qj. Quadrato-jugal, p. 60. 
Lr. Lambdoidal ridge, p. 58. r. Rostrum, p. 57. 
m.t. Mammillary tuberosities, p. 57. sq. Squamosal, p. 58. 
maz.pal. Maxillo-palatine plates, p. 62. sup.o. Supra-orbital plate, p. 59. 
n. Nasals, p. 59. ty. Tympanic cavity, p. 57. 
oc.c. Occipital condyle, p. 57. zy. Zygomatic process, p. 58. 
o.f. Facet for outer head of quadrate, p.58. 
PLATE XVI. 
Pelvis of Phororhacos inflatus Amegh., p. 72. 4 nat. size. 
Fig. 1. From above. Fig. 2. From side. Fig. 3. From below. 
acet. Acetabulum, p. 74. o.f. Obturator foramen, p. 74. 
a.t, Ante-trochanter, p. 73. p. Pubis, p. 76. 
il. Llium, p. 75. s. Sacral vertebra, p, 72. 
is. Ischium, p. 75. u.s. Urosacral vertebre, p. 73. 
is,f. Ischiadic foramen, p. 74. 
