RAIA. 325 
anterior end it is produced into a pointed rostrum and at the 
posterior end is a large hole, the foramen magnum, leading 
into the cranial cavity. On either side of the foramen 
magnum is a large occipital condyle or facet. At the base of 
the rostrum on each side is an olfactory capsule. opening 
Fig. 232.-LATERAL VIEW OF SKULL OF SKATE (Natural Size). 
(Ad nat.) : 
ae 
Rostrum, 
Ligament. 
Palatoquadrate. 
Mandible.___ Nasal Capsule. 
Optic Foramen. 
™ Orbit. 
Spiracular 
Cartilage. 
Foramen for 
rar ee V.and VII. 
ce 
eee 2 Audit 
f 1st Branchial.  Capeule. 
“and Branchial.. 
ard Branchial., s 
4th Branchial. 
3th Branchial. 
ventrally.and containing the nasal sac. On either side of 
the posterior region is a large auditory capsule containing 
the auditory sac. The lateral walls of the cranium bound 
the orbit and have several foramina for transmission of the 
cranial nerves. ° 
