VII 



MOLL USGA SYSTEMATIC REVIEW 



23 



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

 from Leuckart and Nitsche, ZooL Wandtafeln. Both portions of the 

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

 should be placed more anteriorly on the " head" (Koptfuss). 



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

 anterior (physiologically dorsal) view. Of the five pairs of anus, 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. 



