102 ECHINODERMATA. 



PLATE XVI. continued. 



FIG. 5. Fig. 3 four months later than the preceding delineation, now con- 

 verted to purple. 



6. Lobes of the Ovarium in May. 



7. Ova, enlarged. 



PLATE XVII. 



FIG. 1. Asterias rubens. 



2. Ova, enlarged. 



3. Ray of a mutilated specimen, upper surface, 10th June. 



4. The same, under surface. 



5. Fig. 3 as on July 15. 



6. The same, as on July 25. 



7. Ray of a mutilated specimen, upper surface as on July 12. 



8. The same, as on July 30. 



9. Small specimen regenerating the fifth ray. 



PLATE XVIII. 



FIG. 1. Asterias rubens. 



2. Appearance of the skin, enlarged. 



PLATE XIX. 



FIG. 1. Asterias rubens. 







2. Young in an early stage. 



3. Young farther advanced, upper surface. 



4. Under surface. 



5. Group of young in greater perfection. 



6. One of the group enlarged. 

 Figs. 2, 3, 4, 6, enlarged. 



3. ASTERIAS (CBIBELLA) OCULATA. Plate XX. 



This animal is readily recognised. It is provided with five rays, 

 expanding four inches or more between the opposite tips, though seldom 

 occurring as large. The rays are of a different character from those of 

 the preceding species, being stout, round, comparatively short, and taper- 



