PLATE VII. 



PAGE 



Diastylis stygia, G. 0. Sars ; female, . . .44 



(Anatomy — continued. ) 



Fig. 1. Right maxilliped, together with the corresponding part of the branchial 

 apparatus, seen from above. 



Fig. 2. Left maxilliped, isolated, seen from below ; more highly magnified. 



Fig. 3. Terminal joint of same ; strongly magnified. 



Fig. 4. Part of inner edge of carpal joint of same maxilliped, with four of the 

 marginal spines; highly magnified. 



Fig. 5. Gnathopod of first pair, together with the fully developed basal lamella. 



Fig. 6. Gnathopod of second pair. 



Fig. 7. Leg of first pair. 



Fig. 8. Leg of second pair. 



Fig. 9. Leg of third pair, together with the corresponding incubatory lamella. 



Fig. 10. Leg of fourth pair. 



Fig. 11. Leg of fifth paii-. 



Fig. 1 2. Extremity of tail, together with telson and uropoda, seen from above. 



Fig. 13. Anterior part of ventral nervous cord, comprising three partly confluent 

 ganglia, innervating the oral parts. 



Figs. 14-17. Embryo, taken from the marsupial pouch of an adult female specimen, 

 and still included within the inner egg-membrane, represented in four 

 different aspects; from the right side (fig. 14), from the anterior 

 extremity (fig. 15), from above (fig. 16), and from below (fig. 17); 

 magnified about forty-three diameters. 0, ocular plates ; a 1 , anten- 

 nula ; or, antenna ; L, anterior lip ; I, posterior lip ; M, mandible ; m 1 , 

 maxilla of first pair ; m 2 , maxilla of second pair ; mp, maxilliped ; gn 1 , 

 gnathopod of first pair ; gn 2 , gnathopod of second pair ; p 1 -^, legs of 

 first to fourth pairs; T, tail; C, carapace; A, liver; Z (fig. 14), 

 anterior lip. 



