THE CRUSTACEA 



larval stages, more especially among Arctic, abyssal, and freshwater 

 forms. A specially interesting case is that of Palaemo7ietes varians, 



Fig. 174. 

 Later stages ot Leucifer. A, younger Schizopod-stage. '" !B, later Sdiizopod-stage (less 

 magnified). C, Mastigopus-stage. «', antennule ; a", antenna; afti-oAs, pleopods ; abg, 

 uropods ; c, carapace ; dr, antennal gland ; en, flagellum, ex, scale, of antenna ; md, mandible ; 

 mf, m/", first and second maxillipeds ; mx', maxillula ; mx", maxilla ; o, paired eye ; oc, nanplms- 

 eye; ol, labrum ; r, rostrum; 1-6, abdominal somites. (After Brooks, from Korschelt and 

 Heider's Embryology.) 



