454 EEPOET OF COMMISSIONER OF FISH AND FISHERIES. 



dio meters; /, one of tlie sixth pair of legs; g, iiropod, each enlarged 

 twenty diameters. 

 (Figure 14 •was drawn from nature by Mr. J. H. Emerton, the others bj»0. Harger.) 



PLATE IV. 



Figure 16. — Ohii-idotea coeca Harger (p. 338) ; dorsal view, enlarged nearly four 



, diameters ; natural size indicated by the Line at the right. 



17. — The same; o, antennula; 6, antenna; each enlarged twelve diameters. 



18. — The same; a, maxilliped from the right side, external view; I, external 

 lamella; m, maxilliped proper; 1, 2, 3, first, second, and third segments 

 of the palpus of the maxillijted, enlarged twenty diameters ; i, one of 

 the first i)air of legs, magnified twelve diameters; c, uropod from the 

 left side, inner view, showing the two rami articulated neax the tip. 



19. — The same ; pleojiods of second pair from the right side, anterior views, 

 enlarged ten diameters; a, common form in males; h, rarer form in 

 male ; s, elongated stylet, articulated near the base of the inner lamella ; 

 c, form in the female. 



20. — Chiiidotea Tuftsii Harger (p. 340); female; dorsal view, enlarged five 

 diameters ; natural size indicated by the Line at the right. 



21, — The same; left maxilliped, enlarged twenty-five diameters; e, external 

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



22. — The same : pleopod of the second pair, from a male, enlarged twenty 

 diameters ; s, elongated stylet, articulated near the base of the inner 

 lamella. 

 (All the figures were drawn from nature by 0. Harger. ) 



PLATE V. 



Figuke23. — Chiridotea Tuftsii Harger (p. 340); a, au.'eunula; I, antenna; c, leg of 

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

 e, left uroj>od, 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 ; l, 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 paii' 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 ; h, 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; a', distal 

 end of stylet reversed and enlarged thirty diameters. 

 (Figure 24 was diawn liy Mr. J. H. Emerton, the others by O. Harger.) 



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; h, leg of thti first pair, each enlarged six diam- 

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

 diameters. 



