308 George 8. Huntington and Charles F. W. McClure. 
We take pleasure in expressing our thanks and gratitude to our 
friend Mr. M. Petersen for his untiring efforts in our behalf, as well 
as our appreciation of the manner in which he has reproduced our 
complicated reconstructions for publication. 
EXPLANATION OF FIGURES 
Figs. 1, 2, and 3. Dissections of the lymphatics in the neck region of the adult 
cat (Felis domestica), showing the three normal forms of lymphatico-venous com- 
munication which may occur on each side of the body, namely, at the common 
jugular angle, at the jugulo-subclavian angle or at both of these points. 
Figs. 4, 5,6 and 7. Photomicrographs of transverse sections of a 16 mm. cat 
embryo (series 15), sections 233, 237, 239 and 241, respectively, taken at the level 
of the junction of the left Jjugulo-subclavian trunk and left internal jugular vein 
(common jugular confluence) illustrating the ty pe of lymphatico-venous connection 
met with in advanced stages at the two typical points of lymphatico-venous entry. 
Figs. 8 to 11. Composite diagrams illustrating the development of the jugular 
lymph sacs in the cat. Lateral views of left side. 
Fig. 11 A. Dorsal view of fig. 11 in the region of the jugular promontory. 
Figs. 12 to 17. Composite diagrams, continued, illustrating the development 
of the jugular lymph sacs in the cat. Lateral views of left side. 
Fig. 18. Composite diagram (dorsal view) of the precardinal vein and promon- 
tory of the left side, illustrating the separation of the precardinal tributaries 
1, 2, 3 and 4 into their dorso-lateral veno-lymphatice and dorso-medial somatic 
components; also the relation of the dorsal veno-lymphatic plexus to the promon- 
tory and to the promontorial somatic tributaries, 5S, 68, etc. 
Fig. 19. Diagram of precardinal vein and promontory (dorsal view), illustrat- 
ing a case in which the para-precardinal channel is alone involved in the formation 
of the caudal division of the ventral veno-lymphatic plexus. 
Fig. 20. Diagram of left precardinal vein and promontory (dorsal view), 
illustrating the role played by the veno-lymphatic component of the precardinal 
tributary 4 (4VL) in forming the rounded appendage of the caudal division of the 
ventral veno-lymphatic plexus, sometimes met within the later stages. 
Fig. 21. Diagram of left precardinal vein and promontory (dorsal view) illus- 
trating a case in which the para-precardinal channel has given up its connection 
with the jugular promontory, leaving thereon a small conical teat- like process 
near the future common jugular junction. 
