464 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



PLATE 50 



Figures 1-6, Notomastus magnus, new species: Fig. 1, anterior end 

 of mature female, including thorax and 2 abdominal segments, in 

 lateral view, proboscis partly everted, x 2.7; Fig. 2, hooded hook 

 from a posterior segment in lateral view, x 900 ; Fig. 3, hooded 

 hook in frontal view, x 900; Fig. 4, prostomium and part of 

 peristomium in dorsal view, showing palpode and nuchal slits, 

 X 12; Fig. 5, fourth and fifth abdominal segments of mature 

 female individual showing large genital apertures posterior to 

 the papillar lateral organs, in dorsal view, x 6.3 ; Fig. 6, three far 

 posterior segments, in dorsolateral view, branchiae everted, x 6.3. 



