PLATE VIII. 



Fig. 81. — Obliqne ventro-posterior surface view, ca. 98 hours, x 60. 



Fig. 82. — Ventral surface view, ca. 98 hours, x GO. 



Fig. 83. — Cephalic surface view, 120 hours. X 60. 



Fig. 84. — Oblique lateral surface view, ca. 98 hours, x 60. 



Fig. 85. — Dorsal surface view, ca. 98 hours, x ^0. 



Fig. 86. — Oblique dorso-posferior view, ca. 127 hours, x 60. 



Fig. 87 A. — Oblique cross section of cephalic region, ca. 98 hours. X ^42. 



Fig. 87 B. — Oblique cross section of the same embryo, on the right in the 

 plane of a cheliceron, on the left anterior to the cheliceron. x 142, 



Fig. 87 C. — Oblique cross section of the caudal lobe of the same embryo. 

 X 360. 



Fig. 87 D. — Oblique cross-section of the heart (dorsal) region of the 

 same embryo; the left-hand edge of the figure is near the base of a thoracal 

 limb. X 360. 



Fig. 88. — Cross section of heart region, ca., 98 hours. X 360. 



Fig. 89. — Longitudinal section of an embryo of ca. 127 hours, x 142. 



Fig. 90. — Oblique longitudinal section through cephalic region, ca. 98 hours. 

 X 142. 

 Fig. 91 A Longitudinal section, ca, 98 hours. X 142. 



Fig. 91 B. — Longitudinal section of caudal lobe of the same embryo. 

 X 360. 



Fig. 91 C. — Longitudinal section of lung book region of the same embryo. 

 X 360. 



Fig. 92. — Longitudinal section of lung book cut to one side of its meso- 

 blast sac, ca. 127 hours. X 360. 



Fig. 93. — Section through the posterior thoracal and the first four abdominal 

 segments, 120 hours. X 142. 



