Fig. 106. — Portion of a sagittal section through a larva of the 9 p. c. 



stage, showing the intestiue, the intestinal mesentery and the ileo- 



parietal band, x 490. 

 Fig. 107. — Left nephridium of a larva of the 8 p. c. stage (from a stained 



preparation). Ventral surface view. x 500. In the ileo-parietal 



band a few germ cells are present. 

 Fig. 108.— Left portion of body wall from the transverse section next 



posterior to Fig. 92. x 800. 

 Fig. 109. — Sagittal section through the axis of the nephridium of a larva 



of the 9 p. c. stage, x 490. 

 Fig. 110. — Transverse section through the right nephridium. x 800. 

 Fig. 111.— Flight otocyst of a larva of the 8 p. c. stage (from life), x 370. 

 Fig. 112. — Plight otocyst, divided abnormally into two compartments, of 



a larva of the 8 p. c. stage (from life), x 370. 

 Fig. 113. — Median portion of a transverse section through a larva of the 



8 p. c. stage, showing the arrangement of the ganglia, x 210. 

 Fig. 114. —Portion of a sagittal section through a larva of the 6 p.c. 



stage (from the same series as Fig. 91). x 800. 

 Fig. 115. — Body proper of a larva of the 9 p. c. stage, ventral view, from 



a stained preparation, x 220. n. obi. nervus obliquorum. 

 Fig. 116. — Posterior portion of the body proper of a larva, in which the 



8th pair of cirri have just budded out (ventral view), from life. 



x 370. n. pd. nervus peduncularis. 

 Fig. 117. — Occlusor posterior and its "Haftzellen" (h. z.) from a sagittal 



section through a larva of the 9 p. c. stage, x 490. 

 Fig. 118. — Posterior portion of a larva of the 7 p. c. stage, (ventral view) 



from life, x 220. 

 Fig. 119. — Posterior portion of a sagittal section through a larva of the 



7 p. c. stage, x Ca. 900. 

 Fig. 120. — Tentacle from a frontal section through a larva of the 9 p. c. 



stage, x 490. 

 Fig. 121. — Tentacle and two cirri from a transverse section through a larva 



of the 8 p. c. stage, x 490. d. dorsal side. v. ventral side. 



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