114 PROCEEDINGS OF THE ACADEMY OF [1887. 



10. The summit plates of Elaeacrinus Verneuili (after Eth. 

 and Carp., Blast. Catal. PI. XVIII, Fig. 16). 



11. The same of Elaeacrinus elegans (from Hall's type in the 

 National Museum of New York.) 



12-14. The same of Elaeacrinus obovatus, as seen in different speci- 

 mens. Fig. 12, all the sutures visible. Fig. 13. the suture 

 between central piece and smaller proximals obliterated. 

 Fig. 14, also those toward the small anal plate obliterated. 



