454 CHARLES F. SILVESTER 



thrix jacchus). The single opening most frequently met with is 

 at the juncture of the left renal vein and the postcava (fig. 2, 

 Ateles variegatus, 2563). In one individual of Cebus hypoleucus 

 (fig. 6) the right lumbar trunk joined with the intestinal lymphatic 

 trunk to open into the cranial surface of the left renal' vein. In 

 about 50 per cent of the individuals the right lumbar lymphatic 

 trunks possess multiple communications; one may be situated 

 at the juncture of the left renal vein and the postcava, and the 

 other on the ventral surface of the postcava near the right renal 

 vein (fig. 4, Cebus hypoleucus, 2472), or one of these openings, 

 may be situated on the dorsal surface of the left renal vein (fig. 

 8, Saimiris sciurea). In one individual of Ateles vellerosus 

 (fig. 3) the trunks from the right side communicated with the 

 veins at three points, two on the left renal vein and one on the 

 ventral surface of the postcava. 



b. The left lumbar lymphatic trunks. The communications 

 of the left lumbar trunks do not possess so wide a variation in 

 position. They have, however, a greater variation in number 

 than do those of the right side. They may be single (figs. 4 

 and 6, Cebus hypoleucus), or as many as four in number No. 2465 

 Cebus capucinus). In the majority of individuals the lumbar 

 lymphatic trunks from the left side of the body communicate 

 with the left renal vein. In certain cases, however, these trunks 

 all open into the postcava near the renal vein (fig. 8, Saimiris 

 sciurea) ; or by a single aperture cranial to the renal vein (fig. 9, 

 Callithrix jacchus); or they may terminate by two openings on 

 the left renal vein and two on the postcava (Ateles hybridus, 

 2433). 



An interesting variation is met with in Nyctipithecus trivir- 

 gatus. In this individual the right and left lumbar lymphatic 

 trunks join together and open by three communications into the 

 postcava cranial to the left renal vein. 



