EXPLANATION OF THE PLATES. 



PLATE I. 



Figure 1. — Pliiloscia vittata Say (p. 306); dorsal view, enlarged six diameters; 

 natural size indicated by cross at the rigbt. 



2. — Scypbacella arenicola Sniitb (p. 307) ; dorsal view, enlarged about twelve 

 diameters; natural size indicated by cross at the right. 



3. — Actoniscus ellipticus Harger (p. 309) ; dorsal view, enlarged ten diame- 

 ters ; natural size indicated by line at the right. 



4. — Jfera albifrons Leach (p. 315); female; dorsal view, enlarged about ten 

 diameters. 



5. — The same ; maxilliped from the left side, exterior view, enlarged twenty- 

 five diameters ; p, palpus ; I, external lamella. 



6. — The same ; maxilhe, enlarged twenty-five diameters ; a, outer, or second, 

 pair of maxillte; i, inner, or first, pair of maxillie; t, inner, e, outer 

 lobe. 



7. — The same ; inferior surface of the pleou of a female. 



8. — The same ; inferior surface of the pleon of a male. 

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



PLATE II. 



Figure f>. — Jnnira alta Harger (p. 321); dorsal view, enlarged five diameters; 

 natural size indicated by line at the right. 

 10. — Janira spinosa Harger (p. 323); dorsal view of female, enlarged six 



diameters. 

 11. — Mnunopsis typica M. Sars (p. 330) ; dorsal view of male, enlarged about 

 two diameters; i, maxillipeds; vi, basal segment; Z, external lamella; 

 2 and 3, second and third segments of palpus of maxillipeds ; c, outer 

 maxillae ; d, inner maxillse ; e, one of the second pair of legs of the male ; 

 /, one of the natatory legs; g, abdominal operculum of the female, 

 external view. 

 (Figures 9 and 10 were drawn from nature by O. Harger; figure 11 is copied from 

 M. Sars, drawn by G. O. Sars.) 



PLATE III. 



Figure 12. — Janira alta (p. 321); a, maxilliped; p, palpus of maxilliped ; I, external 

 lamella; i, mandible; P, palpus of mandible; d, dentigerous lamella; 

 VI, molar process, enlarged twenty-five diameters. 



13. — The same ; inferior surface of the pleon, a in the female, b in the male, 

 enlarged ten diameters; a, single opercular plate in the female; 

 h, external ; c, median plate of operculum of male. 



14.— Munna Fabricii Kroyer (p. 325); female; dorsal view, enlarged about 

 twenty diameters ; natural size indicated by line at the right. 



15.— Eurycope robusta Harger (p. 332); female; dorsal view-, enlarged six 

 diameters ; natural size indicated by line at the right ; a, antennula, 

 enlarged twenty diameters ; b, maxilliped ; c, mandible ; d, one of the 

 first pair of legs, each enlarged twenty diameters ; d', propodus and 

 dactylus of the first pair of legs, enlarged about thii-ty-eight diameters; 

 e, propodus and dactylus of the second pair of legs, enlarged twenty 



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