VII 



MOLL USC A ONTOGENY 



267 



FIG. 222. Various stages in the development of Sepia (after Koelliker). A, B, 0, D, 

 Anteriorlview ; E and F, from the left side ; G and H, from behind. Lettering as in Fig. 221. In 

 addition : d, rudiment of the funnel-nuchal muscle (collaris) ; di, paired rudiment of the funnel 

 proper ; p, yolk ; cq, edge of the mantle ; t, optic imagination (?) ; u, region of the shell ; q, edges 

 of the two rudiments of the funnel bent round ; r, fins. In G the mantle fold is raised up in/H 

 cut off. 



