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PLATE XXVIII. 
1-7. ScUizaster 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 subaual fascicle of same. 
Specimen covered with spines, natural size, seen from the abactinal side. 
Profile (natural size) of posterior extremity of a specimen intermediate between Figs. 1 and 5. 
7. Anal system of same, with subanal fasciole, somewhat enlarged. 
8-14. Schizaster 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. If. 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 ambulacral petal, with its adjoining fasciole, of a speci- 
men about 55 mm. long, diameter. 
15, 16. Schizaster canaliferus Agass. 
Fig. 15. The extremity of the left petaloid ambulacrum of a specimen measuring 70 ram. long, diam- 
eter. 
Fig. 16. The anal system and fasciole of same. 
