48 ALLEN 
ing obliquely along the ventral surface of the right geniohyoideus 
muscle and above the right hyohyoideus inferior muscle. When 
the median line between the 2 geniohyoideus muscles is reached 
this vessel bifurcates, one branch running along the ventral sur- 
face of each geniohyoideus muscle. Both of these forks supply 
also the intermandibularis muscle. The short geniohyoideus 
artery, which is the left one in this specimen, supplies only the 
posterior part of the left geniohyoideus muscle. The largest of 
the branches of the hyoidean artery is the hyoid arch artery 
proper, which has been designated as the dranchiostegal artery 
(Pls. I and II, figs. 1 and 12; Br.O.A.). This vessel is given 
off a little cephalad of the interhyal and runs along the outer 
ventral edge of the epi- and cerato-hyals. In the region of 
each branchiostegal ray an artery is given off ventrad to supply 
the hyohyoideus superior muscles. In Scorpenichthys one 
branchiostegal artery does not supply all of the superior hyoi- 
deus muscles. Three or 4 such vessels pass over the outer 
surface of the epi- and cerato-hyals and supply from 1 to 3 
hyohyoideus superior muscles; the last one evidently corre- 
sponds to the single branchiostegal artery of Ophiodon. 
What might be called the ¢hyrozd artery (Pl. II, fig. 12; 
Thyr.A.) arises either from the second right or the second left 
efferent branchial artery. In Fig. 12 it arises from the second 
right efferent artery, flows cephalad under the ventral aorta 
and anastomoses with the first efferent branchial artery. Along 
its short course 2 or 3 small branches could be traced to the 
thyroid gland, one of them supplying also the second left 
obliquus ventralis muscle. 
Pharynx Artery (Pl. Il, fig. 12; Phar.A.).— This vessel 
may have its source from the third left or the third right efferent 
branchial artery. In the specimen from which fig. 12 was 
drawn it arose, caudad, from the third right efferent branchial 
vessel and, passing obliquely over the ventral aorta it bifurcates 
in the region of the combined afferent trunk of the third and 
fourth branchial arches. The smaller right pharynx artery 
(Pl. I, fig. 12; R.Phar.A.) supplies the right side of the 
pharynx, the transversus ventralis muscle, and the right phar- 
yngo-clavicularis externus and internus muscles; while the 
