PLATE V. 



FIGUBE23. Chiridotea Tnffcsii Harger (p. 340); a, antennula; 6, antenna; c, leg of 

 the first pair ; d, leg of the fourth pair ; all enlarged twelve diameters ; 

 e, left uropod, or opercular valve, inner view, enlarged ten diameters. 



24. Idotea irrorata Edwards (p. 343); dorsal view, enlarged two diameters; 

 natural size shown by the line on the left. 



25. The same ; a, antennula ; b, antenna ; c, left uropod or opercular valve, 

 external view ; all enlarged six diameters. 



26. The same; a, right maxilliped, enlarged twelve diameters, I, external 

 lamella ; m, basal segment ; 1, 2, 3, 4, segments of palpus of maxilliped ; 

 b, pleopod of the second pair from a male, enlarged eight diameters, show- 

 ing stylet, s, articulated near the base of the inner lamella. 



27. Idotea phosphorea Harger (p. 347); dorsal view, enlarged about two 

 diameters ; natural size shown by the line on the right. 



28. The same ; a, antenna, enlarged six diameters ; 6, maxilliped, enlarged 

 twelve diameters, showing, I, external lamella ; m, basal segments; 1, 2, 

 3, 4, segments of the palpus of maxilliped ; c, leg of the first pair ; d, leg 

 of the second pair, both enlarged six diameters ; e, right uropod, or 

 opercular valve, inner view, enlarged six diameters. 



29. The same ; pleopod of the second pair from a male, enlarged eight diam- 

 eters ; s, stylet articulated near the base of the inner lamella ; ', distal 

 end of stylet reversed and enlarged thirty diameters. 

 (Figure 24 was drawn by Mr. J. H. Enierton, the others by 0. Harger.) 



