PLATE CIX. 



Nauticaris futilirostris (p. 606). 

 Fig. 1. Lateral view ; enlarged twice. 



Hetairus gaimardii (p. 611). 

 „ 2. Lateral view ; enlarged four times. 

 „ 2d. Mandible. 

 „ 2g. Third siagnopod. 

 „ 2h. First gnathopod. 



Hetairus tenuis (p. 613). 

 .. 3. Lateral view ; enlarged three times. 



Hetairus debilis (p. 615). 

 „ 4. Lateral view ; enlarged four times. 



