316 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



PLATE 45 



Figures 1 to 8, Nerinides acuta: Fig. 1, anterior end of adult, from 

 life, X 53 ; Fig. 2, anterior end of planktonic larva near the 

 settling stage, in dorsal view, x 107; Fig. 3, same, in left lateral 

 view, X 107; Fig. 4, tridentate hook from a posterior parapodium 

 of adult, in frontal view, x 650 ; Fig. 5, same hook seen from 

 side without hood, x 650; Fig. 6, spermatozoon from adult in 

 May, X 650; Fig. 7, cross section of egg membrane, x 650; Fig. 8, 

 surface view of egg membrane, the smaller circles represent 

 punctations between the larger, raised areas, x 650. 



Figures 9 to 16, Polydora citrona: Fig. 9, anterior end from left side, 

 showing greatly reduced prostomium over large peristomial ring, 

 with small eyespots at sides, x 107; Fig. 10, anterior end from 

 front, the triangular area represents oral aperture, the small 

 dorsal lobe the reduced prostomium, x 107; Fig. 11, pygidiura 

 in posterior view, with 4 clavate cirri, x 260 ; Fig. 12, one of 

 5 larger, anterior modified spines from fifth setiger, x 260; Fig. 

 13, 2 of the smaller, posterior modified spines from fifth setiger, 

 X 260; Fig. 14, an unbroken hooded setae from a posterior neuro- 

 podiura, X 370; Fig. 15, a similar seta with broken tip, showing 

 the hooded cap extending far beyond the broken tip, x 370; Fig. 

 16, a 3-segmented larva taken from tube of adult, x 260. 



