EXPLANATION OF PLATE I. 



Merhippolyte calmani, sp. nov. 



Fig. I. — Lateral view of one of the type specimens, X 2|. 



,, 2. — Carpus of the first peraeopod showing the excavation on 

 the internal margin. 



,, 3. — Mandibular palp. 

 ,, 4, — Antero-lateral margin of carapace. 

 • 

 Aristaeomorpha foliacea (Risso). 



Fig. 5. — Carapace of a male in lateral view. 



Aristaeomorpha rostridentata (Bate). 

 Fig. 6. — Carapace of a male in lateral view. 



Peneopsis coniger (Wood-Mason). 

 Fig. 7. — Thelycum of a typical specimen. 



Hemipeneus crassipes (Wood-Mason). 



Figs. 8, 9. — Last three segments of external maxillipede of the 

 male showing the two different types of structure. 



Sphenocarcinus aurorae, Alcock. 

 Fig. 10. — Dorsal view of a male specimen, X 2. 



