Xtl 



PHYLUM MOLUJSCA 



mesenteron. From whatever source it may be derived, the latter 

 becomes distinguishable as a cell-plate which becomes converted 



ctn 



Fio. 710. Two later stages in the development of Loligo. A, from the funnel side; S, 

 obliquely from above. Letters as in preceding figures ; ne. cart, nuchal cartilage. (After 

 Korschelt and Heider.) 



B 



man-l 



yk.s 



j,- Ki _ 7 1 1. Two stages in the development of Loligo, later than those represented in Fig. 710. 

 From the anal or funnel side. Letters as in preceding figure ; in addition, fin, fins ; fun. 

 funnel. (After Korschelt and Heider.) 



into a vesicle at first opening below against the yolk epithelium, 

 there never being any direct communication with the yolk. An 



