POLYCH^TA OF THE L.M.B.C. DISTEICT. 171 



Plate XIV. 



Fig. 1. Egg capsule of Scoloplos armiger, nat. size. 



Fig. 2. Ovum separated from capsule, X 80. 



Fig. 3. Extrusion of polar bodies, X 80. 



Figs. 4 — 11. Stages in segmentation of an ovum, X 80. 

 p.h. polar bodies; mic. micromeres; mac. macro- 

 meres. 



Fig. 11. Shows macromeres entirely enclosed by micro- 

 meres except at the blastopore. 



Fig. 12. Egg capsule oi Arenicola marina, nat. size. 



Figs. 13—18. Stages in the larval development of same, 

 X 225. e.g. eye-spots ; z. zonar band of ciha ; 

 a. anterior tuft of cilia; in. mouth; v. ventral 

 band of cilia ; c. first segmental constriction of 

 larval body. 



Figs. 17, 18 are diagrams to show the ciliary arrangement. 



Fig. 19. Appearance of zonar cilia as seen from above 

 while the embryo is whirling rapidly, X 225. 



Figs. 20, 21. Most advanced embryos observed; c. first 

 segmental constriction, X 400. 



Plate XV. 



Dasijchone herdmani, n. sp. 

 Fig. 1. Entire animal, dorsal view, X 3. 

 Fig. 2. Lateral view^ of anterior portion of body, X 4J. 

 Fig. 3. Ventral view of same, X 4J. 

 Fig. 4. Part of a branchial filament, X 44. a. dorsal 



processes; h. eye-spots; p. pinnae. 

 Fig. 5. Extremity of a radiole, X 44. 

 Fig. 6. Dorsal process from a different specimen to Fig. 



4 ; here the margin is less puckered, X 60. 

 Figs. 7, 8. Capillary setae. 7, superior; 8, inferior, X 



250. 

 Fig. 9, Uncinus, X 250, 



