458 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



PLATE 47 



Figures 1-5, Notomastus (Clistomastus) tenuis: Fig. 1, anterior end 

 in right lateral view, x 14; Fig. 2, hooded hook from anterior 

 abdominal segment in frontal view, xl700; Fig. 3, hooded hook 

 in lateral view, xl700; Fig. 4, prostomium with eyespots and 

 nuchal slits, in dorsal view, x 56; Fig, 5, four abdominal seg- 

 ments in right ventrolateral view, x 31. 



