XII 



PHYLUM MOLLUSCA 



801 



the eyes ; and still nearer the vegetal pole a scries of paired 

 elevations, the rudiments of the arms. 



(I7i 



eye. 



~ cteri. 



art 



FIG. 701. Two later stages in'the development of Loligo. A, from the funnel side. B,'obli<|iiely 

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

 Heider.) 



B 



TnCLTLt 



Flu. 702. Two stages in the development of Loligo, later than tln-.s.- n-]irescntcd in Fig. 701. 

 From the anal or funnel side. Letters as in preceding figure ; in addition, fin, tins. (After 

 Korschelt and Ileider.) 



After the complete enclosure of the yolk by the blastoderm, the 

 mouth (mo.) is developed as an oval depression between the rudi- 



