PLATE LXV. 



Sergestes — Development. 



Acanthosoma dorsispinalis (370). 

 Fig. 1. Lateral view ; enlarged twenty-five times. 



Acanthosoma Isevirostratis^ (p. 374). 

 „ 2. Lateral view; enlarged twenty-eight times. 



Mastigopus dorsispinalis (p. 375). 

 ,, 3. Lateral view; enlarged twentj^ times. 

 ,, i.k.l. Branchiae attached to the second gnathopod, and first and second pereiopochi. 



Mastigopus tenuis (p. 428). 

 „ 4. Lateral view ; enlarged twenty times. 

 ,, 4b. Base of peduncle of first antenna, with otolith. 

 „ 4c. Second antenna. 

 „ il. Third pereiopod ; extremity. 



1 Habitat. — North of Admiralty Islands, between Stations 221 and 222. Associated 'with Acanthosoma dorsispinalis 

 ainl Mastigopus dorsispinalis. Length, 3 mm. (0 - 12 in.). 



