PLATE XXVIII. 



1-7. Scliizaster orbignyanus A. Ag. 



Denuded specimen, natural size, seen in profile. 



The same, seen from the abactinal pole. 



The same, seen from the actinal side. 



Anal system of subanal fasciole of same. 



Specimen covered with spines, natural size, seen from the abactinal side. 

 Fig. 6. Profile (natural size) of posterior extremity of a specimen intermediate between Figs. 1 and 5. 

 Fig. 7. Anal system of same, with subanal fasciole, somewhat enlarged. 



8-14. Scliizaster fragilis Agass. 



Fig. 8. Young Schizaster, seen in profile, 23 mm. long, diameter. 



Fig. 9. Anal system of same, enlarged. 



Fig. 10. Somewhat younger Schizaster than Fig. 8, 10 mm. long, diameter, seen in profile. 



Fig. 11. Anal system of same, with its subanal fasciole. 



Fig. 12. Still younger specimen, only 6 mm. long, diameter, seen in profile. 



Fig. 13. Anal system and adjoining part of test of same. 



Fig. 14. Extremity of the petaloid right anterior ambulacra] petal, with its adjoining fasciole, of a speci- 

 men about 55 mm. long, diameter. 



15, Mi. Schizaster canaliferus Agass. 



Fig 15. The extremity of the left petaloid ambulacrum of a specimen measuring 70 mm. long, diam- 

 eter. 

 Fig. 16. The anal system and fasciole of same. 



