114 ALLEN 
jected, but only one satisfactorily, the other specimens having 
been badly torn by the hooks. Upon dissection several interest- 
ing variations were noticed, and it seemed desirable to include a 
representative of the family Azoplopomatide in this paper. 
Carotid Artertes.—In Anoplopoma there are no common 
carotids ; both carotids arise separately from the dorso-cephalic 
corner of the first efferent branchial artery. The znternal 
carotid (fig. 35; 1.Car.A.), which is given off first, presents no 
peculiarities. While the external carotid (fig. 35; E.Car.A.) 
is a much smaller vessel than in the other genera, and simply 
supplies the facial region without anastomosing with the hyoi- 
dean artery to form the mandibular artery ; it immediately gives 
off the vessel designated as the fseudobranchial or afferent 
pseudobranchial artery (fig. 35; Ps.A.), which is as large as 
the external carotid, and which might be said to arise with the 
external carotid from the first efferent branchial artery. The 
course of the pseudobranchial artery is ventrad behind the hyo- 
mandibular, exhausting itself by giving off numerous afferent 
pseudobranchial filament arteries. Near its distal end the 
pseudobranchial artery receives the dorsal branch of the hyoi- 
dean artery, and it is probable that the hyoidean artery furn- 
ishes the pseudobranch, especially the ventral part of it, with 
some of its blood supply, but most of it evidently comes from 
the pseudobranchial artery, which is much larger at its source 
from the external carotid than at the point of anastomosis with 
the hyoidean artery. This arrangement somewhat resembles 
the pseudobranchial supply in Gadus, according to Miiller (50) 
and Parker (61), but differs from it considerably. In Gadus the 
afferent pseudobranchial artery is a branch of the hyoidean 
artery, and the dorsal continuation of the main stem, which is 
much reduced in caliber, anastomoses with the internal carotid 
of the circulus cephalicus. | 
FTyoidean Arteries (fig. 35 ; Hyo.A.).— One of the most strik- 
ing differences in the circulatory system of Azoflopoma is in 
connection with this vessel. As in Ophzodon each hyoidean 
artery has its origin from the ventral ends of the first efferent 
branchial artery. Passing along the dorsal surface of the hyoid 
arch it gives off the characteristic branch to the branchiostegal 
