122 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



As the number of arms increases, adolescent autotomy, by acceleration of 

 development, becomes a more and more fixed and fundamental character and 







195 



FIG. 195. LATERAL VIEW OK TYPE SPECIMEN OF OXYMKTRA FIXSCHII. 



takes place at progressively younger stages. Thus whereas in the case of species 

 with less than lf> arms the adult size is reached before the loss of any of the 



