256 THE SALAMANDER 



The renal sinuses (s.ly.ren.) are extensive sacs occupying the space 

 between the mesenteric laminae suspending the oviducts in the 

 female, or the Wolffian duct in the male. They are particularly 

 extensive in the posterior region and are interrupted only by the blood- 

 vessels or ureters, which also traverse the mesentery. There are also 

 smaller extensions into the mesovarium. The walls of the oviduct 

 are richly supplied with lymphatic capillaries forming a network. 



The pair of subvertebral trunks emerge again from the cisterna 

 lymphatica anteriorly, and, although they are still extensively con- 

 nected by bridges, their double nature is more apparent. At the 

 level of the subclavian arteries a pair of transverse trunks pass out, 

 parallel with these vessels, to the subscapular sinuses. The subverte- 

 bral trunks themselves follow the curve of the systemic arches, and, 

 after joining with the axillary and jugular sinuses, enter the central 

 lymph heart (see p. 260). It is convenient to call this loop truncus 

 peri-pharyngeus (Fig. 70; t.ly.p-ph.). The section of the subvertebral 

 trunks just described, i.e. the region anterior to the cisterna lym- 

 phatica, is the 'ductus thoracicus' of Panizza, who erroneously sup- 

 posed that there was a single trunk only which split into two at the 

 systemic arches. He also believed that the ductus thoracicus dis- 

 charged into the subclavian veins. Meyer thought that the anterior 

 bifurcation was an artificial production due to Panizza's use of 

 mercury, and that the ductus thoracicus actually ended blindly in 

 the region of the heart. This view is, of course, equally wrong. 



Entering the subvertebral trunks dorsally are a number of seg- 

 mental vessels from the dorsal muscles. Hoyer and Udziela have 

 shown that, in the larva, these vessels anastomose with the T. lymph, 

 long, dorsalis and send branches to the lateral lymph hearts, while 

 in the anterior or 'thoracic' region they also fuse with one another 

 to form a longitudinal vessel running close beside the vertebral 

 column on either side. They call this vessel the truncus lymph, long, 

 paravertehralis. In the adult it is not possible to trace the connexions 

 with the dorsal vessel, which itself tends to disappear and is distorted 

 by the development of the cutaneous glands, but the connexion with 

 the lymph hearts exists, and it is possible to find some traces of the 

 paravertebral vessel, although it shows signs of degenerating. 



E. Lymphatics oj the Pectoral Region (PI. XVIII, fig. 68). 



These are very extensive and paired in the adult, but the actual 

 arrangement does not differ markedly from that of the larva. The 

 largest and most important sinus in the pectoral region is the sub- 

 scapular sinus (plexus axillares, Panizza). In the adult this sinus 



