DISTRIBUTION OF LYMPHATICS IN SCORP/ENICHTHYS 8l 



and Uranoscopus as emptying directly into the cephalic 

 sinus. 



8. In Scor-p<znichth\$ there are distinct superficial and pro- 

 fundis facial lymphatic systems. The superficial system arises 

 in the snout region, follows the upper inner surface of the sub- 

 orbital stay through the orbit, and after receiving a branch from 

 the opercular region joins the jugular papilla of the cephalic 

 sinus directly behind the prootic process ; while the profundus 

 system takes its origin from a large orbital sinus, and could be 

 traced to a point directly in front of the foramen formed by the 

 prootic process with the skull, but no further. Very likely it 

 passes through this foramen below the jugular and empties into 

 the abdominal sinus. Vogt describes somewhat similar vessels 

 in the salmon as uniting in a common trunk that emptied into 

 the cephalic sinus, which is located under the clavicle. 



9. There are in Scorpcenichthys 2 lymphatic canals running 

 along either side of the hyoid arch. The ventral or posterior 

 one is evidently the main trunk, since it collects the lymph from 

 the branchiostegal region and expands into a sinus behind the 

 interhyal, which receives the dorsal or anterior trunk. This 

 hyoidean sinus tapers down dorsad into a papilla that empties 

 into the cephalic sinus. 



10. Strange to say, my dissections have revealed no lym- 

 phatic vessels coming from the cranial cavity ; these doubtless 

 exist, but the injection mass has failed to reach them. From 

 the arrangement of the blood vessels one would expect to find 

 one of the trunks passing out of the cranial cavity near the V and 

 VII complex, and joining one of the large lymphatic sinuses 

 attached to the side of the skull. Very likely there is a poste- 

 rior trunk, which in some way or another unites with the mye- 

 lonal trunk. In some previous work on the vascular system the 

 myelonal trunk of a large Ophiodon was injected, and upon 

 opening up the cranial cavity all of the semi-circular canals of 

 the ear were found to be filled with injecting mass. 



11. An extremely important vesicle in Scorpcenichthys is the 

 abdominal sinus, which is situated directly below the kidney, 

 and forking with it is prolonged cephalad to the orbit. It 

 receives the lymphatics from the reproductive organs, the inter- 



