108 



BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



Measurements: A, of a large individual; 5, of a medium-sized 

 individual — 



Measurements. 



mm. 



Length of body 0. 13 



Width of body .087 



Length of nucleus .03 



Width of nucleus . 0152 



771771. 



0.09 



.044 



.0185 



.012 



FIO. 74. ZEIiLKEIBI/LA DABWINII, X 460 DIAMETKBS : tt IS IN IX>NOITODINAIi PISSION ; 



b AND O ARE DADGHTBtt CELLS ; 6 SHOWS TWO OP THE PRIMARY LINES OF INSERTION 09 

 cilia; in O ALL THE LINES OF INSERTION OF CILIA ARE DRAWN FOR A SMALL AREA, 

 SHOWING HOW THE LINES BECOME CROWDED ANTERIORLY BY THE INTERPOLATION 0» 

 ACCBSSOEY LINES. 



