No. 3-] 



STUDIES ON CEPHALOPODS. 



28 1 



V V 



Loligo Pealei. 



Fig. X. — An optical section of an unsegmented ovum. The optical axis coincides 

 with the antero-posterior axis of the ovum. 



Fig. XI. — A profile view of an unsegmented ovum. 



Figs. XII and XIII. — Side views of squid embryos at two stages of development. 

 The flexure of the body corresponds, in the main, with the outline of the unseg- 

 mented ovum (Fig. XI), A, anterior; D, dorsal; P, posterior; /, proctodcKum; 

 J, stomodoeum; V, ventral. 



