VII 



MOLL USCA—ONTOGENY 



267 



Fio. 222.— Various stages in the development of Sepia (after Koelliker). A B C D 

 Anteriorlview ; E and F, from the left si.le ; G and H, from behind. Lettering a.s in Fig. 221 ' In 

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

 proper ; p, yolk ; a-^, edge of the mantle ; t, optic invagination (?) ; u, region of the .sliell • 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. ' 



