CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF THE PLATES. 



Unless otherwise stated, all the figures have been outlined with camera 

 lucida and the details filled in free-hand. The fine structure of setae, paleae, 

 and elytra has in every instance been studied with a much higher power than 

 the magnification of the figures would indicate. 



EXPLANATION OF PLATE V. 

 Figs. 1-7 illustrate Euphrosyne. 



Fig. 1. "Gill" of Euphrosyne aurantiaca, sp.nov. The darker lines indi- 

 cate the more refractive axial substance (blood-vessels?). In glycerine; X 36. 



Fig. 2. Tip ofsimple, bifid, dorsal seta,.£\ aurantiaca. In glycerine; X 300. 



Fig. 3. Tip of ringent, serrated, dorsal seta of the same. In glycerine; 

 X 300. 



Fig. 4. Tip of one of the stouter, bifid, ventral setae of the same. In 

 water; X 300. 



Fig. 5. "Gill" of Euphrosyne arctia, sp. nov. In glycerine; X 36. 



Fig. 6. Tip of ringent, serrated, dorsal seta, E. arctia. The stippling indi- 

 cates particles of calcic carbonate, with which all the setae of Euphrosyne are 

 impregnated. In water; X 300. 



Fig. 7. Tips of ventral setae, large and small, of the same. In water; 

 X 300. 

 , Figs. 8-14 illustrate Eurytho'e californica, sp. nov. 



Fig. 8. Anterior end of Eurytho'e californica, from San Pedro, California. 

 Alcoholic specimen; X 19. 



Fig. 9. Posterior aspect of a middle parapod of female specimen from 

 Pacific Grove, California. In glycerine; X 19. 



Fig. 10. Tip of serrated, dorsal seta. Cleared in glycerine; X 300. 



Fig. 11. Tips of smooth, dorsal setae, slender and stout; X 300. 



Fig. 12. Tip of long, slender, bifid seta from upper portion of the ventral 

 series; X 300. 



Fig. 13. Tip of short, stout, bifid seta from lower portion of ventral fas- 

 cicle; X 300. 



Fig. 14. Greater portion of one of the short, hastate seta? of the ventral 

 fascicle. In glycerine; X 300. 



Fig. 15. Cephalic lobe of Chrysopetalumoccidentale, sp. nov., with tentacle 

 and antennae; X 86. 



Fig. 16. Ventral aspect of anterior end of C. occidental. Proboscis partially 

 everted; X 86. 



