REPORT ON THE ECHINOIDEA. 297 



Fig. 8. Interior view of apical portion of test, showing the purse-like pouches under the 



large Lovenia-like primary spines. 

 „ 9. Magnified portion of the actinal surface of the posterior interambulacral area. 

 „ 10. Interior view of pouched rings corresponding to the primary tubercles of the 



actinal surface. 

 „ 11. Magnified view of actinostome. 

 „ 12. Magnified view of the apical system. 



PLATE XXV. 



Zdnopneustes (Paleopneustes) murrayi, A. Ag. (figs. 1-9), p. 168. 



Fig. 1. Test partly denuded, partly covered with spines, seen from the abactinal side ; 

 natural size. 



2. Same, seen from the actinal side. 



3. Same, seen in profile. 



4. Same, seen facing the anal system. 



5. Abactinal system, magnified. 



6. Magnified view of anal system, and of subanal fasciole. 



7. Magnified view of actinostome and of surrounding plates. 



8. Interior view of apical system, and of tubes leading to genital organs and to 

 limestone canal. 



9. Magnified view of part of one of the ambulacral tubes and plates adjoining the 

 actinostome. 



PLATE XXVI. 



Spatagocystis challenger i, A. Ag. (figs. 1-11), p. 141. 



Fig. 1. Seen in profile. 



„ 2. Same, seen from the actinal surface. 



„ 3. Same, seen from the abactinal side. 



„ 4. Same, seen facing the anterior extremity. 



„ 5. Same, seen facing the anal extremity. 



„ 6. Profile view, showing course of alimentary canal. 



„ 7. Profile view of smaller specimen. 



„ 8. Same, seen from the actinal side. 



„ 9. Same, seen from the abactinal side. 



„ 10. Same, seen facing the anal extremity. 



(ZOOL. CHALL. EXP. — FART IX. 1881.) I 38 



