VII 



MOLL USOA— ONTOGENY 

 D 



267 



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

 Anteriorlvlew ; E and F, from the left side ; G and H, from behind. Lettering aa m Pig. 221. In 

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

 proper ; jj, yolk ; aj, edge of the mantle ; t, optic invagination (?) ; «, region of the shell ; 5, edges 

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

 cut off. 



