PLATE XXVII. 
Macropneustes spatangoides A. Aq. 
Fig. 1. Seen in profile, natural size. 
Fig. 2. Another specimen, seen from the abaotinal side, natural size. 
Fig. 3. Enlarged view of actinostome of same. 
Fig. 4. Enlarged view of the reticular peripetaloiis fascicle of the specimen of Fig. 2. 
Fig. 5. Enlarged view of anal .system and subanal fasciule of the same. 
Fig. 6. Profile outline of a large specimen, with high posterior extremity, natural size. 
Fig. 7. The same, seen from tlie abactinal pole ; the apical part of the petaloid ambulacra has become 
atrophied, as is so frequently the case in allied genera. 
