EXPLANATION OF PLATE I. 
Merhippolyte calmant, sp. nov. 
Fic. 1.—lLateral view of one of the type specimens, X 23. 
2.—Carpus of the first peraeopod showing the excavation on 
the internal margin. 
3.—Mandibular palp. 
4.—Antero-lateral margin of carapace. 
Aristacomorpha foliacea (Risso). 
Fic. 5.—Carapace of a male in lateral view. 
Aristaeomorpha rostridentata (Bate). 
Fic. 6.—Carapace of a male in lateral view. 
Peneopsis comger (Wood-Mason). 
Fic. 7.—Thelycum of a typical specimen. 
Hemipeneus crasstpes (Wood-Mason), 
Fics. 8, 9.—Last three segments of external maxillipede of the 
male showing the two different types of structure. 
Sphenocarcinus aurorae, Alcock. 
Fic. 10.—Dorsal view of a male specimen, X 2. 
