PLATE XXVr. 
1-3. UrechinuB naresianus A. Aa. 
Fig. 1. Actinostome of specimen 33 mm. long, diameter. 
Fig. 2. Abactinal system and adjoining part of test of same. 
Fig. 3. Anal system and adjoining part of test of same. 
4. Rhinobri33U3 micrasteroides A. Aa. 
Fi". 4. Specimen 32 mm. long, diameter, seen from the abactinal side. 
5, 6. Schizaster (Periaster) limicola A. Aq. 
Fig. 5. Anal system of specimen (i8 mm. long, diameter. 
Fig. 6. Apical system, witli surrounding part of test of same. 
7-13. Brissopsis lyrifera Agass. 
Elongated type, seen from the abactinal side, natural size. 
The same, seen in profile. 
Enlarged view of posterior extremity of test, showing the anal .system and fasciole, with the 
subanal fasciole. 
Portion of lateral interamlnilacral part of test near the ambitus. 
Portion of posterior lateral ambulacral zone. 
Portion of anterior lateral amljulacral zone. 
Globular type of the species, seen from the abactinal pole, natural size. 
The same, seen in profile. 
Posterior part of test of same, enlarged, corresponding to Fig. 9 in the elongated type. 
Corresponds to Fig. 10 of the elongated type. 
Corresponds to Fig. 11 of the elongated type. 
Corresponds to Fig. 12 of the elongated type. 
Fig. 
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Fig. 11. 
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12. 
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