568 J; & “WILSON AND: J: BP. RI, 
continuation backwards of the labio-alveolar lamina or Anlage 
of the “ lip-furrow.” 
The accompanying figures in the text are outlines of the 
identical epithelial structures in the lower jaws of the same 
D 
Fic. 2, a—z.—Pig embryo of 20 mm. head-length. Four serial coronal 
sections through the molar region of the lower jaw. a. Some distance 
behind m;. 8B. Two sections in front of a. c. Through posterior part 
of mz. D. Through middle region of mz. /.0,= labial laminar out- 
growth. /.gr.=lip groove. x 45. 
series. (The lower jaw was chosen as affording a better series 
of gradations of otherwise exactly similar conditions.) 
