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PLATE IX. 
Aspidodiadema antillarum A. Ag. 
Specimen witli spines, test 11 .mm. in diameter, seen in profile. 
Same with the spines cut off, seen facing an ambulacral area, showing the sheathed pedicellariaB. 
Portion of test of a specimen 11 mm. in diameter, seen from the actinal side ; denuded. 
Portion of test of same as Fig. .3, seen from the ahactinal pole ; denuded. 
Fig. 5. Actinostome, with termination of the adjoining ambulacral areas, showing the suckers, the gills, 
and the large buccal tentacles of Fig. 2. 
Fig. 6. Portion of denuded test of specimen 11 mm. in diameter, seen facing one of the ambulacral 
areas. 
The same as Fig. 6, seen facing one of the interambulacral areas. 
Denuded test of specimen 9 mm. in diameter, seen from the actinal side. 
Genital ring of same, somewhat more magnified. 
One of the sheathed ambulacral pedicellariae, greatly magnified. 
Long-stemmed, long-headed trifid flexible pedicellaria, placed above ambitus. 
Magnified view of a piece of the basal part of a primary radicle. 
Large hyaline, globular, short-stemmed ambulacral sphieridia, found near the abactinal system ; 
magnified. 
Smaller, long-stemmed actinal ambulacral spha;ridia ; magnified. 
Young sheathed pedicellaria. 
Small, short-headed, short-stemmed trifid ambulacral pedicellaria. 
Actinostome of J'oung Aspidodiadema measuring 5 mm. in diameter. 
Genital ring and anal system of same specimen : neither the ocular nor the genital pores are as 
yet formed in this specimen. 
Fig. 19. Young Aspidodiadema 6 mm. in diameter, seen from the actinal side : the primary spines are 
cut off. 
Fig. 20. The same as Fig. 19, seen from the abactinal pole, sliomng the anal proboscis. 
Fig. 21. Genital ring of small Aspidodiadema 3.5 nun. in diameter : the genital pores are already 
formed. 
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