RM2AJC39N–Bulletins of American paleontology . Height of fragment 24.5 mm, width 20 mm. Ex-terior and interior views of part of a connected ambulacrumand interambulacrum, X 1.7. 10. Specimen L600al. PRI27662. Spine recovered from specimen L600a. Length 5.1mm, diameter above neck 1.2 mm, X 5.4. 11-13. SpecimenL600C, PRI 27663. Height 10 mm, breadth of arch 7.5 mm.Views of half-epiphysis, X 3. All of the above specimensare from the Playa Grande Formation (Catia Member). 358 Bulletin 252 Explanation of Plate 16 Figure Page 1-7. Echinometra lucunter (Linnaeus) 302 1-4. Specimen A606a. PRI 27664. Length 45 m
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