PLATE IX. 



FIGURE 52. Astacilla granulata Harger (p. 364); a, maxilliped ; m, basal segment; 

 I, external lamella; b, outer maxilla; c, inner maxilla; all enlarged 

 twenty diameters. 



53. Sphaeroma qnadridentatum Say (p. 368); dorsal view, enlarged five 

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



54. The samk$ a, antennula ; b, antenna ; c, pleopod of the second pair, from 

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

 all the figures enlarged ten diameters. 



55. Limnoria lignorum White (p. 373) ; dorsal view, enlarged ten diameters ; 

 natural size indicated by the line at the right. 



56. The same ; a, antennula ; b, antenna ; c, maxilliped ; d, maxilla of the 

 outer or second pair ; c, maxilla of the inner or first pair ; /, mandible, 

 all enlarged twenty-five diameters ; e', distal end of outer lobe of first 

 pair of maxillas, enlarged sixty-six diameters. 



57. The same ; , last segment of pleon, with attached uropods; dorsal view, 

 enlarged ten diameters; b, uropod with dotted adjacent outline of last 

 segment of pleon, enlarged thirty diameters ; c, first pair of pleopods ; 

 d, pleopod of the second pair, from a male, showing stylet, 8, articu- 

 lated to the inner lamella ; both figures enlarged twenty diameters. 



58. Cirolana couchamm Harger, (p. 378) ; lateral view, enlarged about three 



diameters. 



(Figure 53 was drawn by Mr. J. H. Emerton, 55 by Prof. S. I. Smith, 58 by Mr. J. 

 H. Blake, and the others by O. Harger. ) 



