Henry L. Bruner ay 
origin, a system of closely anastomosing vessels, which extend from the 
dental furrow almost to the middle line, and caudad to the openings of 
Jacobson’s organ. In front of these openings the two sinus palatini 
laterales are again connected across the middle line by a short transverse 
vessel, sinus palatinus transversus posterior. Into the last discharges 
the sinus palatinus medius (s. p. m., Text Fig. 2), which begins imme- 
diately behind the choanez and runs rostrad in the middle line. ° 
Behind the sinus palatinus transversus posterior the two sinus palatini 
laterales again separate and diverge from the midle line, each sinus 
including two or three large vessels. In a posterior direction the num- 
ber of these vessels increases to occupy the greater space made by the 
divergence of the jaws, the stronger vessel lying close to the dental fur- 
row. Behind the teeth this larger vessel communicates with the vena 
labialis superior by three or more small vessels (c. U., Text Fig. 2), which 
run through the submucosa of the upper jaw. Behind the level of these 
anastomoses the sinus palatinus lateralis is gradually reduced, both as to 
the number and size of its vessels, until only the vena pterygoidea 
remains. 
The larger vessels of the sinus palatini can be readily seen in the 
living animal through the mucous membrane. References to these sin- 
uses are to be found in the papers of Leydig, 72, p. 99, and Born, 79, 
p- 98, but no complete description is given. 
c. VENA CEREBRALIS MEDIA. 
(Ue Chom: ext Big, 2.) 
In early embryonic stages of Lacerta agilis, as described by Grosser 
and “Brezina, 95, the vena cerebralis media discharges into the vena 
jugularis interna through the posterior part of the foramen trigemini. 
Later the extracranial part of the vein is lost and a more anterior outlet 
is formed, the vena cerebralis media secunda, which runs from the 
anterior part of the foramen trigemini and joins the vena jugularis 
interna below the cranium. The same authors also state, that with the 
approach of adult life the vena cerebralis media is broken into two parts 
by the degeneration of its middle section. I have been unable to find 
any evidence of degeneration in my specimens of Lacerta agilis. A con- 
tinuous vena cerebralis media also occurs in a specimen of Agama colo- 
norum, in which the entire vein is very conspicuous because of a natural 
injection of blood. 
In adult Lacerta the vena cerebralis media arises from the vena longi- 
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