EXPLANATION OF PLATE XII. 
Figure 57.—Nephthys picta, (p. 583;) anterior part of body and head, much enlarged ; 
dorsal view. 
58.—Nephthys bucera, (p. 583;) anterior part of body and head, enlarged; ven- 
tral view. ; f 
59.—Nephthys ingens, (p. 583;) anterior part of body and extended proboscis ; 
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.—The same ; anterior region of body and head; dorsal view. 
64.—Marphysa Leidyi, (p. 593;) anterior part of body and head, enlarged about 
three diameters; dorsal view. 
(Figures 57 and 58 were copied from Ehlers; all the rest were drawn from nature by J. H. Emerton) 
