Coe and Kunkel— California Linbless Lizard. 359 
bodies are more or less intimately fused together, and in some indi- 
viduals all three are connected by a continuous mass of pancreatic 
tissue, the three bodies then being represented as distinct lobes of a 
single gland. 
Of the pancreas lobes, one lies on the ventral and left side of the 
portal vein, close beside the pylorus. The second (text-figs. 5, 6) is 
situated somewhat posteriorly to this left lobe, and on the ventral 
side of the portal vein, and may be called the median lobe ; it is 
sometimes slightly bilobed, and occasionally connected directly to 
the left lobe. The third lobe, which is intimately fused with the 
spleen (text-figs. 5-7), is usually situated a little anterior to the 
median lobe and to the right of the portal vein (text-figs. 5, 6); it 
may consequently be considered as the right lobe. It is usually con- 
nected with the left lobe by a mass of pancreatic tissue between the 
portal vein and the pylorus. Both the splenic and pancreatic tissues 
are so closely fused into a single mass that the spleen must be 
looked upon as an appendage to the right lobe of the pancreas. 
Spleen.—As described above, the ovoid right lobe of the pancreas 
Figure 7. Outlines of right lobe of pancreas (p) in 
four individuals, showing its more or less intimate 
connection with the spleen (sp). x 6. 
exhibits a marked differentiation posteriorly, in that the anterior part 
is pale and whitish in color, while the posterior portion is deeply 
pigmented (text-figs. 5-7). A longitudinal section shows that the 
pale portion is composed of true pancreatic tissue and the pigmented 
part has the histological structure of the spleen. The boundary 
between the two kinds of tissue is clearly marked by a thin layer of 
connective tissue. 
The spleen retains its natural ovoid shape and is imbedded anteri- 
orly in the pancreatic mass, the convexity of the spleen fitting into 
a corresponding concavity in the pancreas. The extent to which the 
anterior portion of the spleen is buried in the pancreas varies in 
different individuals, as illustrated in text-fig. 7. The pancreas 
appears to grow back over the spleen by an outgrowth of its small 
lobules, so that the posterior border of the gland is irregular and 
