1898-1902. No. 18.| CRUSTACEA. 43 



Explanation of the Plates. 



PI. I. 



Stephos arcticus, G. 0. SARS. 



Fig. 1. Adult female, dorsal view, magnified 80 diameters. 



2. A male specimen, viewed from left side ; same amplification. 



3. Posterior antenna. 



4. Masticatory part of mandible. 



5. Mandibular palp. 



6. Anterior rnaxilliped. 



7. Posterior maxilliped. 



8. Leg of 1st pair. 



9. Leg of 2nd pair. 



, r 10. Leg of 3rd pair. 



11. Leg of last pair in female. 



12. Last pair of legs in male, viewed from the posterior face. 



13. Terminal joint of left leg of same, more highly magnified and 

 viewed from the outer side. 



PI. II. 



Zaus Aurelii, POPPE. 



Fig. 1. Adult ovigerous female, dorsal view, magnified 104 diameters. 



2. Rostral plate, with right anterior antenna. 



3. Posterior maxilliped. 



4. Leg of 1st pair. 



5. Leg of 3rd pair. 



6. Leg of last pair. 



Psamathe Arthuri (POPPE). 



Fig. 7. Adult female, dorsal view, magnified 68 diameters. 



8. Anterior antenna. 



9. Mandible with palp. 



10. Leg of 1st pair. 



11. Leg of last pair. 



