DISTRIBUTION OF LYMPHATICS IN SCORP/ENICHTHYS 43 



the myelonal lymphatic trunk ; also in front of each alternate 

 neural spine there is a neural artery, coming from the dorsal 

 aorta, and in front of the other alternate neural spines, a vein 

 that empties either into the kidney or into the caudal vein. If 

 the neural lymphatic vessels be regarded as veins, there would 

 be one artery and vein in front of one set of alternate neural 

 spines and two veins in front of the other set of alternate neural 

 spines, a very unlikely arrangement. The same correlation 

 can be shown in connection with the haemal vessels. 



Scor^pcenichthy s sometimes reaches a weight of twenty-five 

 pounds and is one of the largest, if not the largest, of the Cot- 

 tidae. It is easily obtained close to shore, is little used as food, 

 lives out of water for hours, remains hard sometime after death, 

 and taken all in all, furnishes a most excellent fish for anatom- 

 ical study. These observations were made at the Hopkins Sea- 

 side Laboratory, Pacific Grove, California. 



The same injecting masses were used that were employed in 

 my studies on the blood vessels (2), and if only the lymphatics 

 were to be injected preference was given to the berlin blue 

 gelatin mass. The fish was severed transversely a little behind 

 the vent and the body was placed head downward in a dish. A 

 glass cannula connected with a piece of rubber tubing was 

 forced forward in the myelonal lymphatic trunk. Usually a 

 little cotton was placed around the cannula and over the cut 

 ends of the dorsal, lateral, and ventral longitudinal lymphatic 

 vessels. The syringe filled with the berlin blue mass was then 

 connected with the rubber tubing, and with slow steady stroke 

 the mass was forced into the lymphatics until they were com- 

 pletely filled, which is usually the case, but should this fail en- 

 tirely or in part, it can be repeated farther forward, or the lateral 

 and ventral lymphatics can be injected in a similar manner. In 

 other species of fishes having a very small myelonal vessel or 

 none at all, one has to resort mainly to the lateral lymphatic 

 trunks. The tail can be injected caudad in a similar manner 

 from the myelonal lymphatic trunk. It is, however, of primary 

 importance in working with fishes that have been caught with a 

 hook to cut the line if the hook has been swallowed. To at- 

 tempt pulling it out would, in all probability, rupture the large 



