EXPLANATION OF PLATE XI. 



FIGUKE 47. Nereis virens, (p. 590;) head little more than natural size ; dorsal view. 

 48. The same ; extended proboscis ; dorsal view. 

 49. The same ; probosci ; sventral view. 

 50. The same ; lateral appendage. 

 51. Nereis limbata, male, (p. 590;) a few segments of the middle region of the 



body, anterior region, head and extended proboscis ; dorsal view. 

 52. Nereis pelagica, female, (p. 591 ;) natural size ; dorsal view. 

 53. The same ; male, natural size ; dorsal view. 

 54. The same ; head more enlarged ; dorsal view. 

 55. The same ; proboscis ; ventral view. 

 56. Phyllodoce gracilis?, (p. 586;) head ; dorsal view. 



(Figure 51 was drawn from nature by J. H. Emerton; 47, 43, 49, 50, 52, 53, ware copied from Ehlera; 

 -54, 55, from Malmgren; 56, from A. Agassiz.) 



