REPORT ON THE ECIIINOIDEA. 287 



Phormosoma hoplaca7itha, Wy. Thorn, (figs. 10-13), p. 101 

 Fig. 1 0. Segment of actinal surface near ambitus ; natural size. 

 „ 11. Same jjlates, seen from the interior of the test. 

 „ 12. Plates from the abactinal surface near ambitus seen from the interior, slightly 



enlarged. 

 „ 13. Same plates, seen from the abactinal surface. 



Asthenosoma tessellatum, A. Ag. (figs. 14, 1.5), p. 88. 

 „ 14 Coronal plates of actinal surface near ambitus (^*-^). 

 ,, ] 5. Coronal plates of abactinal surface near ambitus (i^). 



PLATE XIII. 



Phormosmna tenue, A. Ag. (figs. 1, 2), p. 91. 

 Fig. 1. Seen from the abactinal side with spines. 

 „ 2. Same, seen in profile. 



Both figures natural size. 



PLATE XIV. 



Phormosoma tenue, A. Ag. (figs. 1-4), p. 91. 

 Fig. 1. Interior of the abactinal part of the test to show the ovaries, the large ambu- 



lacral tubes, and the indistinct division into secondary plates of the large 



primary plates of both areas ; natural size. 

 „ 2. Interior view of the actinal part of the test, showing the course of the alimentary 



canal, the mesenteric loops m, m arching over the ambulacral system, and 



the large ambulacral tubes a with the tubes extending at right angles from 



it to the ambulacral vesicles a'. 

 ,, 3. Magnified view of the abactinal system. 

 „ 4. Magnified view of the actinal system. 



PLATE XV. 



Asthenosoma gruhii, A. Ag. (figs. 1, 2), p. 82 



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

 ,, 2. Same, seen in profile. 



