84 



Fig. 36. Transverse section through the tip of a siphonal 

 tentacle passing through an "eye." Zeiss 

 apo. 1*5 mm., compens. oc. 4. 



Fig. 37. A group of secreting alveoli from the nearly ripe 

 ovary. X 25 diam. 



Fig. 38. Transverse section through two contiguous 

 alveoli from a nearly ripe ovary, showing the 

 germinal epithelium and the eggs lying freely 

 in the lumina of the alveoli. X 90 diam. 



Fig. 39. Transverse section through three alveoli from a 

 nearly ripe testis. X 90 diam. 



