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 Ano^lo^omatidcB in this paper. 



Carotid Ar/cries. — In Anoplopoma there are no common 

 carotids ; both carotids arise separately from the dorso-cephalic 

 corner of the first efferent branchial artery. The internal 

 carotid (fig. 35 ; I. 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 -pseudobranchial or afferent 

 ■pseiidobranchial 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 arter}^ furn- 

 ishes the pseudobranch, especiall}^ 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 arter3^ This arrangement somewhat resembles 

 the pseudobranchial supply in Gadus, according to IMliller (50) 

 and Parker (61), but differs from it considerably. In Gadus the 

 afferent pseudobranchial artery is a branch of the h3'oidean 

 artery, and the dorsal continuation of the main stem, which is 

 much reduced in caliber, anastomoses with the internal carotid 

 of the circulus cephalicus. 



Hyoidean Arteries (fig. 35 ; Ilyo. A.). — One of the most strik- 

 ing differences in the circulator}^ system of Anoploponia is in 

 connection with this vessel. As in Ophiodon each hyoidean 

 artery has its origin from the ventral ends of the first efferent 

 l:)ranchial arter}-. Passing along the dorsal surface of the liyoid 

 arch it gives off the characteristic branch to tlie branchiostegal 



