EXPLANATION OF PLATE XV. 
Figure 79.— Ammotrypane fimbriata, (p. 604;) ventral view. 
80.—Cirratulus grandis, (p. 606;) natural size, from a living specimen; lateral 
view. ; 
81.—The same; natural size, from a preserved specimen ; dorsal view. 
(Figures 79 and 81 were drawn from nature by J. H. Emerton ; figure 80, by A. E. Verrill.) , 
