EXPLANATION OF PLATE XII. 



Figure 57. — Nephtbys pi eta, (p. 583 ;) anterior part of body and head, much enlarged ; 

 dorsal view. 



58. — Nephtbys bucera, (p. 583 ;) anterior part of body and head, enlarged ; ven- 

 tral view. 



59. — Nephthys ingens, (p. 583 ;) anterior part of body and extended proboscis j 

 ventral view. 



60. — The same ; dorsal view. 



61. — Podarke obscura, (p. 589 ;) dorsal view, from a specimen preserved in 

 alchohol and much contracted in length. 



62. — Nectonereis megalops, (p. 592;) ventral view. 



63. — Tbe same ; anterior region of body and head ; dorsal view. 



64. — Marphysa Leidyi, (p. 593;) anterior part of body and head, enlarged about 

 tbree diameters ; dorsal view. 



(Figures 57 and 58 were copied from Ehlers ; all the rest were drawn from nature uy J. H. Emerton) 



