468 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



PLATE 52 



Figures 1-4, Heterontastus filiformis: Fig. 1, abdominal hook in 

 frontal view, x 2546; Fig. 2, abdominal hook in lateral view, 

 X 2546; Fig. 3, distal end of long-handled, thoracic hook, in 

 frontal view, x 1533; Fig. 4, distal end of long-handled, thor- 

 acic hook, in lateral view, x 1533. 



