28 WILLIAM F. ALLEN 



extent similar to Anguilhi and Tinea. An atrium and ventricle 

 are present and they communicate with each other. The ven- 

 tricle empties anteriorly into the sinus venosus caudalis of the 

 caudal vein. Anteriorly the atrium receives a common trunk 

 formed by the union of the longitudinal hsemal and the lateral 

 lymphatic trunks; while posteriorly it receives the caudal lym- 

 phatic trunk, which according to Favaro in this species simply 

 passes through the hypural interval, without expanding into any 

 sinus lymphaticus caudalis that communicate with the posterior 

 portions of the lateral trunks. It nevertheless continues through 

 the basal canal of the caudal fin, and is continuous with the dorsal 

 and ventral trunks, which are said to be rather rudimentary. 

 Favaro's account of the arrangement of the caudal lymphatic 

 vessels in Coricus rostratus (pp. 208-10 and fig. 121) is more like 

 Scorpsenichthys than any of the above mentioned species. In 

 Coricus no sinuses corresponding to the atrium and ventricle 

 were described. There is, however, a longitudinal neural trunk, 

 which anastomoses with the lateral and caudal trunks, and the 

 common trunk thus formed empties into the sinuses venosus 

 caudalis of the caudal vein. The caudal trunk is said to have a 

 little swelling at the base of the tail, without assuming the appear- 

 ance of a sinus lymphaticus caudalis. Nothing is said concern- 

 ing the dorsal and ventral lymphatic trunks, but the longitudinal 

 haemal trunk of other species is absent in Coricus. 



PROFUNDUS LYMPHATIC SYSTEM 



In Scorpsenichthys and Clinocottus the profundus system, which 

 consists of the longitudinal neural and haemal lymphatic trunks 

 together with their branches are very large and important canals, 

 far more so than the subcutaneous trunks. 



Longitudinal neural or superior vertebral lymphatic trunk. 

 (Figs. 3-7, and 12 L.Neu.T.). — This enormous trunk is situated 

 in the neural canal directly above the myelon or spinal cord, being 

 separated from it by a tough fibrous tissue septum. Its exact 

 position is shown in transverse section (fig. 12, L.Neu.T.). Since 

 this trunk in Scorpsenichthys and Clinocottus has no direct con- 



