354 MESSES. C. SHEARER, W. DE MORGAN, AND H. M. FUCHS 



Fig. 5. — Pluteus. 12 days. X 100. From the dorsal aspect. Commencement of 



the preoi'al arms and of the anterior ciliated epaulettes. Apical ends of 



body-rods incurved. 

 Fig. 6. — Pluteus. 25 days. X 55. From the dorsal aspect. Anterior ciliated 



epaulettes further advanced. 

 Fig. 7. — Pluteus. 16 days. X 55. From the dorsal aspect. Antero-latei'al arms 



unusually divergent. Anterior ciliated epaulettes developed. 

 Fig. 8. — Pluteus. 26 days. X 55. From the left side. Anterior and posterior 



ciliated epaulettes and posterior pedicellaria present, ^c^mns-rudiment 



well advanced. 

 Fig. 9.— Fully formed pluteus. 22 days. X 55. From the dorsal aspect. This 



pluteus has developed more rapidly than the preceding. 



Figs. 10-18. — E. acutiis ^ XE. acutus $ . 



Fig. 10.— Gastrula. 65 hours. X 180. 



Fig. 11. — Prism larva. 65 hours. X 180. From the ventral aspect. More 



advanced than the preceding. 

 Fig. 12. — Pluteus. 4 days. X 180. From the ventral aspect. Skeletal rods of 



antero-lateral and postoral arms developed. Spinous condition of apical 



rods. 

 Fig. 13. — Pluteus. 11 days. X 100. From the ventral aspect. This larva has 



stippled pigmentation and unusually long arms. 

 Fig. 14. — Pluteus. 17 days. X 100. From the ventral aspect. Postero-dorsal 



arms developed, and preoral arms commencing. 

 Fig. 15. — Pluteus. 21 days. X 55. From the dorsal aspect. Commencement of 



pinching oflP of anterior and posterior ciliated epaulettes. 

 Fig. 16.^ — Pluteus. 26 days. X 55. From the dorsal aspect, ^c^mws-rudiment 



appearing. Epaulettes further advanced. 

 Fig. 17. — Pluteus. 33 days. X 55. From the dorsal aspect. 

 Fig. 18. — Fully formed pluteus. 42 days. X 55. From the dorsal aspect. 



Posterior epaulettes complete. Posterior pedicellaria present. 



Figs. 19-25. — E. miUaris'^ xE. miliaris $ . 

 Fig. 19. — Prism larva. 45 hours. X 180. 

 Fig. 20. — Pluteus. 6 days. From the ventral aspect. Apical ends of body-rods 



club-shaped. 

 Fig. 21. — Pluteus. 7 days. From the left side, showing the preoral lobe. 

 Fig. 22. — Pluteus. 15 days. X 55. From the dorsal aspect. Development of the 



postero-dorsal and commencement of the preoral arms. Appearance of 



the Ecli i nus-vvid\ment and of the anterior ciliated epaulettes, with the 



green pigment patches typical of E. niiliaris. 



