292 THE VOYAGE OF H.M.S CHALLENGER. 



PLATE XIX^ 



Asthenosoma tessellatum, A. Ag. (fig. 1), p. 88. 

 Fig. 1. Seen from the actinal side; natural size. 



Phormosoma tenue, A. Ag. (fig. 1), p. 91. 

 „ 2, Seen from the actinal side ; natural size. 



PLATE XIXi\ 



Asthenosoma tessellatum, A. Ag. (figs. 1-4), p. 91. 

 Fig. 1. Seen in jDrofile. 

 ,, 2. Same, seen from the abactinal side ; natural size. 

 „ 3. Abactinal system of same, denuded (f ). 



,, 4. Magnified portion of ambulacral area, to show the pointed tentacles of the 

 abactinal system (f ). 



PLATE XX. 



Hemiaster zonatus, A. Ag. (figs. 1-4), p. 186. 



Fig. 1. Hemiaster zonatus, seen from the abactinal side ; natural size. 



2. Same, seen from the actinal side. 



3. Same, seen from the anal extremity. 



4. Same, seen in profile. 



Hemiaster gibhosus, A. Ag. (figs. 5-16, 22), p. 184. 



5. Hemiaster gibhosus, denuded, seen from the abactinal side (f ). 



6. Same, seen from the actinal side. 



7. Same, seen in profile. 



8. Sam e,seen from the anal extremity. 



9. Magnified view of half the petaloid ambulacra. 



10. Magnified view of portion of the side of the test adjoining lateral ambulacra. 



11. Magnified view of abactinal system. 



12. Group of spines and pediceUarite, from the actinal side. 



13. Granular tubcrculation of miliaries. 



14. 15. Club-shaped spines near actinostome. 

 16. Ambulacral sucker near the actinostome. 

 22. Suckers from the lateral petaloid ambulacra. 



'&• 



