EXPLANATION OF PLATE. XX. 
Ficure 101.—Loligo pailida, (p. 635 ;) dorsal view, about one-third natural size. 
101a.—The same ; the “pen” dorsal side. 
102.—Loligo Pealii ?, (p. 635 ;) a cluster of the eggs. 
103.—The same; an embryo just before hatching, much enlarged; a’, a’, a’, 
a’, the right ‘‘ arms” belonging to four pairs; c, the side of the head; 
e, the eye; f, the caudal fins; h, the heart; n, the mantle in which 
color-vesicles are already developed and capable of nee their 
colors; 0, the internal cavity of the ears; 8, the siphon ; y, the portion 
of the yolk not yet absorbed. : 
104.—The same; an embryo in an earlier stage of development, more highly 
magnified ; the letters are the same as before. 
105.—The same; a young specimen, recently hatched, found swimming at the 
surface, dorsal view. 
(Figures 103, 104 are camera-lucida drawings made from the living specimens, by A. E. Verrill; 
all the others were drawn from preserved specimens, by J. H. Emerton.) 
