78 



U.S. NATIONAL MUSEUM BULLETIN 291 

 Table V. — Comparison of numbers of arm suckers 



exhibit less of a proportional increase than the other arms, but they 

 maintain between a fourth and a third more suckers than in abyssicola 

 of the same size group. 



Not only is the average number of suckers greater in bacidifera^ but 

 the ranges of values between the two species show virtually no overlap, 

 so that the species are quite easily separable on numbers of arm 

 suckers alone. 



