I20 ALLEN 
From the previous description it would seem that the vascular 
system of Anoplopoma exhibits many points of resemblance to 
the more generalized Teleosts. The external carotid, hyoidean, 
subclavian, hypobranchial, and coronary trunks appear to have 
a more primitive arrangement than is even shown in Sedastodes. 
IX. GENERAL CONSIDERATIONS AND SUMMARY. 
Since it is almost impossible to determine whether certain 
variations in the blood vessels are primitive or secondary it is 
not the intention of this paper to draw any conclusions as re- 
gards the classification of this group on the basis of the circu- 
latory system, until after the anatomy of the other systems has 
been worked up. Still it is thought, although perhaps not 
practicable, that the vascular system might be used in the class- 
ification of families and genera, but could not be used in the 
discrimination of species. In the genus Sedastodes a great 
number of species were studied, both generalized and special- 
ized, but no more variation was noticed in different species than 
-could be found among individuals of the same species. 
Several interesting anastomoses were noticed in both the 
arterial and venous systems. In Ofphzodon we have in the re- 
gion of the nasal sac a union of a branch of the internal carotid 
with one of the external carotid. The hyoidean artery anas- 
tomoses with the main stem of the external carotid to form the 
mandibular artery. A branch of the ventral artery joined one 
of the subclavian in the pectoral fincanal. The anterior spinal 
artery, a branch of the subclavian, united in the neural canal 
with the myelonal artery, a branch of the internal carotid. 
Two gall-bladder arteries unite on the surface of the bladder. 
Usually the posterior mesenteric artery communicates with in- 
testinal artery,, and there are connecting arteries between the 
right pyloric czeca artery and intestinal artery,,. In Sebastodes 
the two anterior spermatic arteries unite with the posterior or 
spermatic artery proper. In Hexagrammos the two hepatic 
arteries anastomose. In Azoplopoma the hyoidean arteries 
anastomose with the pseudobranchial arteries, and the hypo- 
branchial arteries unite with the anterior ventral artery. Among 
the veins in Ophzodon there is an anastomosis under the nasal 
