EXPLANATION OF PLATE XX. 



Figure 101. — Loligo pallida, (p. 635 ;) dorsal view, about one-third natural size. 

 101<x. — 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'", 



ft''', the right " arms " belonging to four pairs ; c, the side of the head ; 



€, the eye ; /, the caudal fins ; li. the heart ; n, the mantle in which 



color-vesicles are already developed and capable of changing their 



colors ; o, the internal cavity of the ears ; s, 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-hicida drawings made from the living specimens, by A! E. Verrill ; all 

 the others were drawn from preserved specimens, by J. H. Emerton.) 



