EXPLANATION OF PLATE XX. 



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

 lOln. — The same ; the " pen " dorsal side. 

 102. — Loligo Pealii ?, (p. 635 ;) a cluster of the eggs. 

 103. — The same ; au embryo just before batching, much enlarged; a, a", a'", 



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



e, the eye; /, the caudal fins; /(.the heart; 7(,tho mantle in which 



color-vesicles are already developed and cajiable 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 au 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 

 tbe others were drawn from preserved specimens, by J. U. Enierton.) 



