Mar., 1903.] Spelerpes longicaudus. 389 
EXPLANATION OF 
PLATES. 
Key to 
Plate 8 . 
A reconstruction of the skeletal elements of the head. 
SIDE 
VIEW. 
la. 
Upper labials. 
Trabecula. 
pc. 
Parachordal cartilages. 
tr. 
pf. 
Posterior foramen. 
lb. 
Lower labials. 
pn. 
Coronoid process. 
qd. 
Quadrate cartilage. 
au. 
Auditory capsule. 
111c. 
Meckel’s cartilage. 
ba. 
First branchial arch. 
bh. 
Basilival cartilage. 
bb. 
Second branchial arch. 
ch. 
Ceratoliyal cartilage. 
be. 
Third branchial arch. 
nl). 
Nasal capsule. 
bd. 
Fourth branchial arch. 
op. 
Optic foramen. 
Key to 
Plate 
9 - 
A reconstruction of the skeletal elements of the head. 
VIEW OF THE BRANCHIAL 
APPARATUS. 
bh. 
Basilival cartilage. 
ba. 
First epibranchial cartilage. 
uh. 
llrohyal cartilage. 
bb. 
Second epibranchial cartilage. 
bra. 
First ceratobranchial cartilage. 
be. 
Third epibranchial cartilage. 
l.rb. 
Second “ “ 
bd. 
Fourth epibranchial cartilage. 
brc. 
Third “ “ 
ell. 
Ceratoliyal cartilage. 
Key to 
Plate 
IO. 
A reconstruction of the skeletal elements of the head. 
VIEWED FROM ABOVE. 
tr. 
Trabeculae. 
pc. 
Parachordal cartilages. 
bp. 
Basal plate of the trabeculae. 
au. 
Auditory capsule. 
la. 
Upper labials. 
ell. 
Notochord. 
111 ). 
Nasal process. 
Key To 
Plate 
II. 
Reconstruction of muscles. 
Figure /.— 
Lateral view 
Mini. 
M. temporalis. 
Mra. 
M. rectus abdominis. 
Mia. 
M. levator arcuum branehi- 
Mcb. 
M. cerato-brancliialis. 
alium. 
Mdm 
. M. depressor maxillae infer- 
Mid. 
M. longissimus dorsi. 
ioris. 
Mli. 
M. longissimus dorsi, inferior 
Mm. 
M. masseter. 
fasciculus. 
Figure 2 . — Ventral view. 
Msin. 
M. submentalis. 
Mdb. 
M. depressor arcuum branch- 
Msb. 
M. submaxillaris. 
ialium. 
Mcb. 
M. cerato-brenchialis. 
Mgh. 
M. genio-hyoideus. 
Msb. 
M. sternohyoideus. 
Figure 3. 
Reconstruction of branchial musculature. 
Msm. 
M. submentalis. 
Msh. 
M. sternohvoideus. 
Mgh. 
M. geniohvoideus. 
Mca. 
M. constrictor arcuum bran- 
Msb. 
M. submaxillaris. 
chialium, first fasciculus. 
Mcb. 
M. cerato-brancliialis. 
Mce. 
M. constrictor arcuum bran- 
Mhb. 
M. liypobranchialis. 
chialium, 2nd fasciculus. 
Mab. 
M. depressor arcuum branch- 
Mci. 
M. constrictor arcuum bran- 
ialium. 
chialium, third fasciculus. 
T11 the reconstruction the ceratobranchial muscles are removed, the sternohyoideus 
muscles are cut out so as to show the M. depressor arc-branchialimn, and one of the 
geniohyoideus muscles has been cut to show the origin of M. sternohyoideus. The sub- 
maxillaris has been represented as slit, and the flaps turned back. 
