18 WILLIAM F. ALLEN 



Of the older writers who studied this system in fishes, Vogt 

 in the case of Sahiio is the only author to describe the lateral 

 trunk as extending to the caudal fin. In addition to terminating 

 in a caudal sinus situated at the end of the last vertebra, he finds 

 (pp. 135-6) each trunk extending caudad to the base of the cau- 

 dal fin, where it separates into a dorsal and a ventral sinus (pi. 

 K; fig. 3, 67), each of which is said to communicate with a cor- 

 responding sinus on the opposite side. In the Ganoid, Amia 

 (=Amitus), Hopkins found in one specimen that a branch 

 (p. 373 and fig. 11, t.) connected a large trunk at the base of the 

 tail with the lateral trunk, close to the union of the latter with the 

 caudal sinus. No such caudal continuation of the lateral trunk 

 was observed in the Ganoid, Lepisosteus. Favaro finds in Tinea 

 vulgaris, Esox ( = Lucius) lucius, and Coricus rostratus that the 

 lateral lymphatic trunk is continued to the tail. In Tinea they 

 are represented as anastomosing at the base cf the tail with the 

 sinus lymphaticus caudalis, in this relationship agreeing with 

 Clinocottus and Ophiodon; while in the other two species no 

 anastomosis was recorded, thus agreeing with Scorpsenichthys. 

 Hyrtl who also studied Lucius must have overlooked this poste- 

 rior continuation of the lateral trunk. In the Dipnoi, Kellicott 

 (p. 208) portrays the lateral subcutaneous veins of Ceratodus 

 as being similar to the lateral cutaneous veins as described by 

 Parker for Mustelus, and posteriorly they are said to anastomose 

 with the caudal \ein. 



According to Fohmann, Jones, Jossifov, and Favaro there are 

 no lateral trunks in the fresh water eel, Anguilla. 



C/Oncerning the termination of the lateral trunk in Selachians, 

 Parker (p. 721) notes that the lateral cutaneous vein in Muste- 

 lus anastomoses with the dorsal and the caudal veins. Sappey 

 (p. 38) finds in Squalus that the lateral lymphatic trunk expands 

 into a fibrous sinus that terminates in the caudal vein. Mayer 

 (pp. 316-7) describes the vena lateralis as receiving the vena dor- 

 salis, and after joining the vena ventralis the latter empties into 

 the vena caudalis. 



As for the Ganoids, Hopkins (p. 372) represents each lateral 

 lyjuphatic trunk of Amiatus as terminating under the last verte- 



