THE DEVELOPMENT OF THE SQUID.

LOLIGO PEALII (LESUEUR).

Fig. 20

	Diagrammatic view of the left side of a squid embryo, at the stage shown in figure 10; a, a, a, arms; c, sinus space around the yolk sac; e, eye;/, integument of yolk sac; g, gill; m, mouth; ma, mantle; v, velum; r, rectum; s, inner siphon fold; s', outer siphon fold; t, eye-stalk; y, yolk sac.