PLATE IX. 



Tbaccus brevipes. (p. 62). 

 Fig. 1. Dorsal aspect of the animal, male; nat. size. 

 ,. 1q. Second somite of pleon. 

 „ ](/. Second pleopod. 



I havens altivrenatus (p. 63). 

 ,. 2?. Dorsal view of a female ; nat. size. 



Arctus sordidus (p. 66). 



„ 3. Dorsal view of a female; nat. size. 



,. 3". One side of the ventral aspect of pereion ; enlarged. 



,. 3</ t ■ Second pleopod of the male. 



„ Zq%. Second pleopod of the female. 



.. 3r t ■ Third pleopod of the male. 



„ 3r$. Third pleopod of the female. 



Arctus orientalis (p. 6S). 

 „ 4. Dorsal view of the female ; nat. size. 

 „ 4". One side of the ventral aspect of pereion ; enlarged. 

 ,, 4o $ . Extremity of posterior pereiopod of the male. 

 „ 4o$. Extremity of posterior pereiopod of the female. 



