i 



176 



ALLAN HANCOCK PACIFIC EXPEDITIONS 



PL. 17 



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Idiobryssus coelus, new species. Spines and tuberculation are largely omitted 

 in order to bring out clearly the characteristic concave petaloid area, sur- 

 rounding fascicle and elevated periproct. X6+- 



Fig. 1. Seen from above. 



Fig. 2. Seen from right-hand side. 



