294 George S. Huntington and Charles F. W. McClure. 
6. A new element has been added to the veno-lymphatie sac 
which Lewis has described in connection with the lymph sae of 
the rabbit under the name of the subcutaneous duct. It consists 
of an appendage of the dorsal arch of the veno-lymphatie sac, 
which is connected with the lateral surface of the same at two 
points. This appendage increases in size from now on, and, as it 
is constant in its appearance, is worthy of consideration. As we 
have not followed its origin closely, however, we are unable to 
speak authoritatively concerning it. 
Series 474, Harvard Embryological Collection, slides C, D, EL, and F. 
10.7" Embryo 
Reconstruction of left side, 
Lateral aspect fig. 58 and 
Reconstruction of right side, 
Lateral aspect, fig. 59 
We owe the opportunity of studying and reconstructing this 
very important and interesting embryo to the courtesy of Prof. C. 
S. Minot of Harvard University. The length of the embryois given 
as 10.7 mm., but in the development of its jugular lymph sac, it 
corresponds to specimens of our collections, which measure con- 
siderably more-(from 11 to 12.5 mm.). This discrepancy may, 
however, be due to different technique in taking the total length 
measure, as to unusual curvature of the embryo. 
Serially, from the developmental aspect, it follows the stage 
previously described (series 78, 12 mm.), and is an excellent 
example of the apparent complete bilateral temporary separation 
of the voided veno-lymphatic sac, now the closed and empty jugu- 
lar lymph sac, from the permanent veins. The extremely doubt- 
ful connection of the sae with the venous system found by us 
near the jugulo-subclavian angle is cqnfined to a single section on 
the right side (slide E, section 194), and to two sections on the 
left side (slide EK, sections 197-198). Even if this connection 
exists, it differs entirely from both the earlier veno-lymphatic and 
the later definite lymphatico-venous taps. As previously stated 
(p. 194), if the empty sae separates temporarily from the ven- 
ous system, and subsequently rejoins the same by establishing 
