PLATE VI. 



FIGURE 30. Idotea robusta Kroyer (p. 349) ; dorsal view, enlarged two diameters ; 

 natural size shown by the line at the right. 



31. The same; a, antenna; &, leg of the first pair, each enlarged six diam- 

 eters; c, left uropod, or opercular valve, inner view, enlarged four 

 diameters. 



FIGURE 32. The same ; a, maxilliped, enlarged twelve diameters ; I, external lamella ; 

 1, 2, 3, 4, segments of palpus ; &, maxilla of the outer or second pair ; 

 c, pleopod of the second pair from a male, enlarged six diameters ; a, 

 stylet articulated near the base of the inner lamella. 



33. Synidotea nodulosa Harger (p. 351) ; dorsal view, enlarged four diam- 

 eters ; natural size indicated by the line at the right. 



34. The same ; a, antennula ; /, flagellar segment ; &, antenna ; c, leg of the 

 first pair from the right side ; d, right uropod, or opercular valve, all 

 enlarged ten diameters. 



35. The same; a, maxilliped from the right side, showing, I, external 

 lamella ; m, basal segment ; 1, 2, 3, segments of palpus, enlarged 

 twenty diameters ; &, maxilla of the outer or second pair ; c, maxilla of 

 the inner or first pair, both enlarged twenty diameters ; d, pleopod of 

 the second pair from a male, enlarged twelve diameters; s, stylet 

 articulated near the base of the inner lamella. 



36. Erichsonia attenuata Harger (p. 356) ; dorsal view, enlarged three diam- 

 eters, natural size indicated by the line at the right. 

 (Figures 30 and 36 were drawn by Mr. J. H. Emerton, the others by O. Harger.) 



