66 ALLEN 



reaching the posterior end of the orbit it crosses over the facialis- 

 mandibularis nerve and vein, and after passing across the lateral 

 surface of the prootic process unites with the jugular papilla of 

 the cephalic sinus (see Figs. 4 and 5) and ultimately reaches 

 the jugular. Numerous branches were received from the sur- 

 face of the adductor mandibular muscles, and soon after cross- 

 ing the facialis-mandibularis vein, is joined from the rear 

 by a rather large branch, which runs along the dorsal and 

 inner surface of the opercle. No inferior maxillary branch as 

 described by Vogt in the salmon was noticed. 



Profundus facial lymphatic trunk (Figs. 4 and 5, P.Fac- 

 L. V.). — In the last specimen dissected the course of this canal 

 could be followed much better than in any of the others. It 

 appears to be entirely confined to the region of the orbit. In 

 this specimen it started from the dorsal side of the orbit, and 

 passing ventrad across the anterior end of the orbit bifurcates at 

 the ventro-cephalic corner of the orbit, but soon reunites. The 

 outer or sinus portion being much the larger, extends some dis- 

 tance ventrad between the adductor muscles of the palatine arch 

 and the mandible ; a few branches from the adductor mandibular 

 were noticed, and after uniting the common stem passes caudad 

 across the orbit on the surface of the adductor muscle of the 

 palatine arch, a little mesad of the facialis-maxillaris vein, but 

 some little distance inward from the superficial facial lymphatic 

 vessel. This trunk could be traced to a point immediately be- 

 neath the junction of the internal and external jugular veins, 

 but no farther. Very likely it continues caudad below the 

 jugular through the prootic process foramen and empties into 

 the abdominal sinus. The final ending of the profundus facial 

 lymphatic trunk could not, however, be determined. 



6. LYMPHATICS OF THE HYOID ARCH. 



Two distinct lymphatic canals are found running along the 

 dorsal or anterior and the ventral or posterior edges of the arch. 

 Of these the -posterior or ventral lymphatic trunk (Figs. 3 and 4, 

 P.Hyo. T.) appears to be the main stem. It traverses the lower 

 and posterior edge of the epi- and cerato-hyals, and from be- 

 tween each 2 branchiostegal rays receives 1 or 2 small branches 



