48 ALLEN 



attention that this one has. It is easily located and the one 

 from which this system has usually been injected. According 

 to Milne-Edwards (16, p. 473) and Stannius (24, p. 254) this 

 vessel was briefly described and its connection with the ductus 

 of Cuvier noted by Hewson (5) and Monro (14). Vogt (33) 

 however, was the first to show the connection of this trunk with 

 the caudal vein, but (in 1, p. 134) gives the credit of this dis- 

 covery to Hyrtl. From the latter (7) one obtains a most excel- 

 lent account of this vessel. It is represented (p. 233) as arising 

 from numerous dorsal and ventral transverse vessels (Seitenast- 

 Parre) into which empty numerous smaller branches that collect 

 the network coming from the matrix of the scales, and in con- 

 versely restating the course of these vessels he says that the 

 longitudinal trunk empties into the blood-vascular system. 

 Further on (p. 234) he adds that in a successful injection the 

 sinuses at the base of the pectoral and ventral fins and their 

 branches were filled, but that no vessels were noted in connection 

 with the dorsal fins. He also states that the lateral trunk ter- 

 minates in a caudal sinus which empties into the caudal vein, 

 and with Acipenser, Cyprinus, Leiiciscus, Esox and Gobio it 

 ends anteriorly in a thin-walled pear-shaped cephalic sinus 

 situated at the side of the skull directly behind the orbit, which 

 empties into the jugular a little forward of the lower jaw and 

 opercular vein. Shortly before the lateral lymphatic trunk 

 terminates in the cephalic sinus several vessels coming from the 

 jaws, the gills, the tongue and branchiostegal membrane are 

 described as emptying into it. With the salmon and the trout, 

 Hyrtl notes an entirely different anterior mode of communication 

 with the venous system. Here the lateral trunk after curving 

 under the clavicle empties into the sinus of the spermatic vein 

 (Sinus der Holvenen) at its junction with the ductus of Cuvier, 

 and this opening is guarded by a valve opening into the vein. 

 While with Perca luciopei'ca, Tinea c/irysitis, and Cottus gobio 

 both points of union are said to exist. Vogt (1, p. 134-7) also 

 describes this trunk in the salmon with great detail. He noticed 

 the transverse branches emptying into the main trunk, but con- 

 sidered them as extravasations caused by the rupture of the 

 thin-walled lateral canal. Posteriorly this canal is said to end 



