42 G. O. Sars. 



Fig. 3. Same, dorsal view. 

 » 4. Head of male, viewed in front, magnified about 



26 diam. 

 » 5. Leg of 1st pair, maguified 52 diam. 

 » 6. Leg of 6th pair. 

 » 7. Leg of last pair. 



* 8. Just hatched larva (nanplius), ventral view; magni- 

 fied 75 diam. 

 » 9. Larva in a somewhat later stage, dorsal view. 



PL IV. 



Estheria Elizabethæ, G. O. Sars. 



Fig. 1. Shell of a fully grown female, viewed from left side, 



magnified about 9 diam. 

 » 1 a. Part of the shell, at some distance behind the 



umbo, magnified 26 diam. 

 » - 2. Shell of female, dorsal view. 



» 3. Shell of a fully grown male, viewed from left side. 

 » 3 a. Part of the marginal region of a valve, showing 



the dense fringe of bristles on the ribs; magnified 



52 diam. 

 » 4. Shell of male, dorsal view. 



5. Body of a fully grown female, extracted from the 

 shell, and viewed from left side; magnified about 

 14 diam. 



6. Body of a fully grown male, viewed as above. 

 » 7. Male antennula, magnified 26 diam. 



