V Basal part ; masticatory lobes ; palp ; exognatli. 



6 THE VOYAGE OE H.M.S. CHALLENGER. 



Epistome. — Anterior lip (labrum). 

 Posterior lip (mctastoma). 



1. Eijes. — Pedicle; cornea; ocular papilla. 



2. AntennulcB. — Peduncle ; flagella ; male appendage. 



3. AntenncB.—'Ra&dl part; terminal part (peduncle and flagellum) ; scale; 



basal spine. 



4. Mandibles. — Body of mandible ; masticatory part ; cutting edge ; molar 



protuberance ; palp. 



5. First pair of maxillce. 



6. Second pair of maxillcB. 



7. Maxillipeds. — Stem (basal part and palp) ; masticatory lobes ; exopodite ; 



epipodite. 

 8-14. Limbs of the trunk or legs. — Stem (coxal, basal, ischial, meral, carpal, 

 propodal, terminal joints) ; exopod ; epipod ; gills ; incubatory 

 lamellae ; male sexual appendages. 

 Incubatory pouch (marsupium). 



B. Posterior division of body or tail. — Caudal segments ; epimera ; praeanal spine. 



15-19. Caudal limbs (pleopoda ; setiferous lamellse : male copulatory apjsen- 

 dages). 

 20. Uropoda, (last pair of caudal limbs). — Basal |)art : terminal plates ; 

 auditory apparatus (in Mysidte). 

 ^^ 21. Telson (last caudal segment). — Terminal spines; apical incision. 



Luminous globules (" accessory eyes " of earlier authors) in Euphausiidse and 

 Gnathophausia (?). 



C'3 ^:S 



