PLATE 5 
EXPLANATION OF FIGURES 
58 Embryo from upper pole, tilted a little to the right. The position of the 
ten teloblasts are shown; the small cells between the teloblasts on the surface are 
derived from x® and x’? on either side. 
59 Same view as the preceding; the neuroblasts have migrated a little pos- 
teriorly and are approaching each other. 
60 The ecto-teloblasts are nearly in a direct line; the germ bands have be- 
gun to form; the two primary mesoblasts M, M are no longer visible from the 
exterior; the transverse heavily shaded portion shows the approximate point of 
separation between the two ends. 
61 Embryo viewed from the left side; the posterior end is extremely blunt. 
62 Same embryo as preceding, from the upper pole (upper pole corresponds 
to the anterior and posterior ends). Shows very strikingly the close proximity 
of the two ends. 
63-65 Represent the same embryo from the right, left and ventral sides 
respectively. The ectoderm which partially covers the germ bands is not shown. 
66 Embryo from upper pole; bilateral symmetry is well marked; the telo- 
blasts are considerably reduced by the time they come in contact with their 
fellows on the opposite side. 
180 
