PLATE VIII. 



Gnathophausia longispina, G. 0. Sars. 



(Anatomy). 



Fig. 1. Ocular segment, with right eye (o) and right antennular peduncle, from above. 



Fig. 2. Anterior lip {L) and mandibles with their palps, from below: 



Fig. 3. Terminal joint of mandibular palp ; more highly magnified. 



Fig. 4. Cutting edges of mandibles. 



Fig. 5. Posterior lip. 



Fig. 6. Maxillae of first pair, with palp. 



Fig. 7. Maxillae of second pair. ^), palp ; ex, exognath ; x, pigmented basal pro- 

 tuberance. 



Fig. 8. Maxilliped. x, concave surface occurring in place of the exopodite ; ej), 

 epipodite. 



Fig. 9. Leg of first pair, or gnathopod, with attached gill. 



Fig. 1 0. Leg of second pair, ep, rudimentary epipod. 



Fig. 11. Bases of a pair of legs, with the attached gills in situ. 



Fig. 12. Gill, isolated. 



Fig. 1.3. Extremity of a gill-branch ; more highly magnified. 



Fig. 14. Leg of last pair, with male sexual aperture (p) and the rudimentary gill (hr). 



Fig. 15. Male sexual aperture ; more highly magnified. 



Fig. 16. Trunk, with maxillipeds, legs, and gills in situ, viewed from the ventral face. 



Fig. 17. Trunk, together with first caudal segment and oral parts, from right side. The 

 carapace is removed to show the seven segments of the trunk with their gdls. 

 L, anterior lip ; M, mandible ; p, mandibular palp ; m', maxilla of first pair ; 

 m'", maxilla of second pair ; x, pigmented basal protuberance of same ; 

 mp', maxilliped ; ep, epipodite of same ; mp^, leg of first pair or 

 gnathopod. 



Fig. 18. A pleopod. 



Fig. 19. Chaiii of ventral ganglia; 1-9 those belonging to anterior division, following 

 (l-G) caudal. 



Fig. 20. Part of the anterior division of the chain, together with the great ventral artery 

 (a) ; more highly magnified. 



