POLYCHAETE WORMS, PART 1 



153 



-pa 



Figure 42. — Nereidae, a~b, Ceratocephale loveni: a, dorsal view anterior end, with proboscis 

 partially everted; b, parapodium from anterior region, c, Nereis zonata, parapodium 

 from anterior region, d-h. Nereis pelagica: d, parapodium from anterior region; e, 

 compound homogomph spiniger; /, compound heterogomph spiniger; g, compound 

 heterogomph falciger; h, compound homogomph falcigcr. i, Nereis grayi, parapodium 



gradually anteriority and posteriorly. Prostomium (fig. 42a) broader 

 than long, incised anteriorly between the bases of the antennae, with a 

 median groove extending posteriorly. Eyes lacking. Two thick 

 palps and 2 more slender frontal antennae present, the palps and 

 antennae subequal in length and fused at their bases, both jointed, the 

 terminal joints short and pointed. Tentacular segment large, swollen, 



