REPORT ON THE ECHESTOIDEA. 307 



Fig. 10. Interior view of anal system, with termination of intestine. 



11. Interior view of actinostome and plates surrounding it. 



12. Exterior view of actinal system and surrounding plates. 



13. Interior view of actinal system, with the actinal termination of the ambulacral 

 tubes and vesicles. 



14. Primary spine from the abactinal surface. 



15. Club-shaped spine from the edge of the test. 



16. Large triangular-headed pedicellaria from the actinal surface. 



17. Large club-shaped pedicellaria. 



18. Same, seen facing the line of division of the jaws. 



19. Young club-shaped pedicellaria. 



20. Gill-like ambulacral suckers, near the actinostome. 



PLATE XXXV\ 



Genicopatagus affinis, A. Ag. (figs. 1-4), p. 162. 



Fig. 1. Actinostome and surrounding plates of specimen measuring 37 mm. in diameter; 



greatly enlarged. 

 „ 2. Apical system and surrounding plates of same, with large tentacles issuing from 



double pores. 

 „ 3. Anal system of same, covered with spines. 

 „ 4. Ambulacral plates, and adjoining interambulacral plates from the median part of 



the test ; magnified. 



Cystechinus vesica, A. Ag. (figs. 5-8), p. 150. 



„ 5. Abactinal system and adjoining plates. 



„ 6. Same, seen from the interior, genital organs removed. 



„ 7. Portion of ambulacrum and adjoining interambulacral plates, to show the tuber- 



culation of the sides of the test. 

 „ 8. Interior view of lateral ambulacrum and adjoining interambulacral plates. 



Echinocrepis cuneata, A. Ag. (figs 9-13), p. 145. 



,, 9. Seen from the abactinal side ; natural size. 



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



,, 11. Same, seen in profile. 



„ 12. Smaller specimen, seen facing the anterior extremity. 



„ 13. Interior view, showing course of alimentary canal, seen from the actinal side. 



