MOLL USOA—SYSTEMA TIC REVIE W 



23 



Fio. 33.— Spirula prototypes, right aspect (after Chun and Owen), 

 from Leuckart and Nitsche, Zool. WamUafdn. BoUi portions of tlie 

 shell are visible, the inner portion seen througli the mantle. The eye 

 should be placed more anteriorly o)i the " head " (Kopffuss). 



^ 



B 



Fio. 34.— Loligo vulgaris (after D'Orbigny). A, Dorsal (physiologically ventral) view; B, 

 anterior (physiologically dorsal) view. Of the five pairs of arms, the fourth are seen to be 

 developed as long prehensile tentacles ; the eyes, the edge of the mantle, the fins, and the 

 chromatophores in the skin are depicted. 



