308 THE VOYAGE OF H.M.S. CHALLENGER. 



PLATE XXXV'^ 



Periaster Umicola, A. Ag. (figs. 1-4), p, 204. 



Fig. 1. Seen from the abactinal side, half test denuded. 



„ 2. Same, seen from the actinal side. 



„ 3. Same, seen in profile. 



,, 4. Same, seen facing the posterior extremity. 



Lovenia subcarinata, Gray (figs. 5-7), p. 175. 



„ 5. Seen in profile. 



,, 6. Same, seen from the abactinal side, partly denuded 



,, 7. Same, seen from the actinal side. 



Linojmeustes (Paleopneustes) murrayi, A. Ag. (figs. 8-9"), p. 168. 



,, 8. Young specimen, seen from the actinal side. 

 „ 9. Same, seen from the abactinal side. 

 „ 9 a. Same, seen facing the anal extremity. 



Cystechinus clypeatus, A. Ag. (figs. 10, 11), p. 149. 



„ 10. Apical system of large specimen. 

 „ 11. Anal system of same. 



Rhinobrissus hemiasteroides, A. Ag. (figs. 12-15), p. 186. 



„ 12. Seen from the abactinal side, half test denuded. 



,, 13. Same, seen in profile. 



,, 14. Same, seen from the actinal side. 



,, 15. Same, seen facing the anal extremity. 



Pourtalesia ceratopyga, A. Ag. (fig. 17), p. 134. 



„ 17. Anterior extremity of test, to show arrangements of plates, from the abactinal 

 side. 



Cionobrissus revinctus, A. Ag. (fig. 18), p. 188. 



„ 18. Anterior portion of test, seen from the actinal side (f). 

 All figures natural size except fig. 18. 



