ARTIODAOTYLA. 
331 
tlie palatine bones extend as far as the line of the middle of the anterior 
column of the second true molar. The posterior nareal trough is very 
deep, rather sliort, and wider behind, owing to the gentle lateral spreading 
of the pterygoid processes of the alisphenoid. The occipital condyles con¬ 
verge rapidly below, and are almost in contact medially. The basioccipital 
is ungulate in the anterior two-thirds of the middle line. The posterior por¬ 
tion is marked by an angulation on each side, which renders the inferior 
surface flat. The sphenoid is still more strongly angulated on the middle 
line, so that it is separated from the walls of the nareal fossa by an archway 
on each side. 
Foramina. —The lachrymal canal opens on the inside of the orbit. The 
supraorbital foramen is connected by a deep fissure with the orbital margin. 
The foramen infraorhitale anterins opens above the anterior portion of the 
first true molar tooth. The incisive foramina are narrow ovals, extending 
from opposite the position of the second incisor tooth to half-way between 
the third incisor and canine tooth. They are separated by the posterior 
processes of the premaxillary. The external nares form a narrow oval, 
acuminate in front and below, and notching each nasal bone posteriorly 
and above. The palatine foramina are round and opposite the division 
between molars fourth and fifth, in the middle of the palatal face of each 
maxillary bone. The foramen ovale is round, and is situated at the apex of 
the deep notch which separates the anterior boundary of the otic bulla from 
the posterior border of the pterygoid process of the sphenoid. It is isolated 
from the foramen lacerum anterius. The latter is relatively small, and is 
nearly as wide as long. The foramen lacerum postSnus is well separated 
from it, owing to the close appression of the otic bulla and basioccipital 
bone. It is divided into two foramina, of which the ])Osterior is the foramen 
jugulare, while the anterior is the vagal foramen. There is no distinct 
carotid foramen, but the foramen glenoicleum is present, of moderate size. 
The foramen condyloicleimi anterius is rather small, and is situated immedi¬ 
ately under the anterior j^art of the condylar surface. 
Besides the difference in proportions already mentioned, several im¬ 
portant characters distinguish the cranium of this species from that of the 
Llama. One of these is the very slight palatal notch, which only extends 
