96 



BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



anterior. Cirrus iii with 1 1 and 1 segments, the posterior three-fourths 

 as long as the anterior. The basal seven segments of both rami here 

 are armed with short spines in a row near the distal border (fig. 21c), 

 but there are no scattered teeth. 



Vineyard Sound (pi. 19, figs. \-le). The epidermis is persistent. 

 Spur of the tergum usually longer and narrower than in Marco niveus, 



sometimes pointed. 

 Labrum with three 

 teeth on each side. 

 Maxilla with five spines 

 between the upper and 

 pairs, edge 

 Cirrus iii as 

 fig. 20 a, I. Pos- 

 terior cirri as in Marco 

 niveus. 



Vineyard Sound, 

 21553, U.S.N.M. Cir- 



lower 



straight. 



in 



FlG. 22. B. AMPfflTRITE NIVEUS, VINEYARD SOUND. INNER FACE 

 OF THE EIGHTH SEGMENT OF THE OUTER RAMUS OF CIRRUS HI, 

 SHOWING THE SHORT TEETH OF THE OUTSIDE BY TRANSPARENCE. 



1U 



tllO posterior OUCS 



n -,i nil fp. nnr] i QTr>nrk<3 nf 



two or three (fig. 22, eighth segment of outer ramus, inner face; 

 showing the short teeth of the outside by transparence). 



