Figure 13

1830 ANNIVERSARY MEMOIRS OF THE BOSTON SOCIETY OF NATURAL HISTORY 1880

THE DEVELOPMENT OF THE SQUID.

LOLIGO PEALII (LESUEUR).

Fig. 13

An older embryo in the position of figure 12 In this and the following figures, only a small portion of the external yolk sac, y', is represented.

The letters of reference have the following significance in all the figures of this plate; a, arms; a/, Posterior or siphonal pair of arms; a", second pair; a"', third pair; e, eyes; er, otocyst; es, eye stalk;/, fins; g, gills; h, branchial hearts; m, mantle; mo, mouth; re, rectum; si, inner siphon folds; si', lateral siphon folds; sm, siphonal muscle; v, velum; y, yolk; y', external yolk sac; y", yolk mass of the eye stalks and head; y"', and y"", yolk masses of the body and mantle.


	An older embryo in the position of figure 12 In this and the following figures, only a small portion of the external yolk sac, y', is represented.
	The letters of reference have the following significance in all the figures of this plate; a, arms; a/, Posterior or siphonal pair of arms; a", second pair; a"', third pair; e, eyes; er, otocyst; es, eye stalk;/, fins; g, gills; h, branchial hearts; m, mantle; mo, mouth; re, rectum; si, inner siphon folds; si', lateral siphon folds; sm, siphonal muscle; v, velum; y, yolk; y', external yolk sac; y", yolk mass of the eye stalks and head; y"', and y"", yolk masses of the body and mantle.