MARINIE GAMMARIDEAN AMPHIPODA 



77 



Figure 26.— Ampeliscidae : pereopods glandular: a, head, left lateral aspect, showing 

 cuticular lenses and dotted lines indicating internal pigment (lenses unique in Gam- 

 maridea but absent in deep-sea ampeliscids) [see Atylidae]; h, accessory flagellum absent; 

 f, pereopod 4 [often longer than pereopod 5 and of different shape]; d, pereopod 5; e,j, 

 variations in telson; g, urosome, left lateral aspect, note amalgamation of urosomites 2-3. 



Atylidae have ommatidial eyes and lack the special combination of pereopods 4 and 5 



shown here. 



