456 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



PLATE 46 



Figures 1-2, Notomastus (Clistomastus) lineatus: Fig. 1, hooded 

 hook in frontal view, x 2353 ; Fig. 2, hooded hook in lateral view, 

 X 2353. 



Figures 3-4, Mediomastus californiensis: Fig. 3, hooded hook in lat- 

 eral view, X 2800 ; Fig. 4, hooded hook in frontal view, x 2800. 



