cated in structure. The circum-pallial nerves and the branchial nerves 

 have ganglion cells throughout their length. The otocystic nerves origi- 

 nate directly from the cerebral ganglia. (See pp. 43-48, and figs. 15, 23, 

 24, and 25.) 



Sense Organs. — 



Ttie eyes are numerous and optically arranged for the formation of 

 images. The sense tentacles are exceedingly numerous and of ordinary 

 structure. The otocysts have canals that open at the surface of the 

 body and the otocystic nerves join the cerebral ganglia direct. The 

 otoliths are composed of granular material that may have been intro- 

 duced from the outside. (See pp. 48-53, and figs. 10, 20, 22, 24, and 26.) 



Embryology. — 



The development is normal and rather rapid. (See pp. 53-6°, and 

 figs. 27-36.) 



^'.3 



