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Page 798 



18. Prenasler loveni, Cotteau. 



Cotteau, Echinid. tert., p. 34, pi. vi., f. 11 — 15. 



It seems to be straining generic distinctions rather 

 tightly to separate Prenaster from Agassizia ; but it is 

 to be feared that many authors carry subdivision to an 

 excessive length among echinoderms. 



Eocene, S. Barts. 



19. Brissus exiguus, Cotteau. 



Cotteau, Echinid. tert., p. 35, pi. vi., f. 16, 17. 



The examples of this species recorded b}^ me in 1 866 

 Journ. Geol. Soc, vol. xxii., p. 301) as Br. dimidiatus 

 Ag. (—unicolor Klein) were much larger and in better 

 preservation than the single specimen of Cleve's collec- 

 tion. I leave the species under the name given to it 

 by Cotteau, though I have doubts as to the possibility 

 of finding grounds for a clear specific distinction between 

 it and the recent form. 



20. Brissopsis antillarum, Cotteau. 



Cotteau, Echinid. tert., p. 37, pi. vi., f. 19 — 25. 

 Miocene, Anguilla. 



21. Macropneustes antillarum, Cotteau. \ 



Cotteau, Echinid. tert., p. 39, pi. vii., f. 1 — 3. 

 Eocene, S. Barts (also Cuba). 



22. Macropneustes clevei, Cotteau. 



Cotteau, Echinid. tert., p. 40, pi. vii., f. 4 — 7. 

 Miocene, Anguilla. 



For these two species, and for another one found in the 

 Pyrenees, Cotteau has created a new genus, Peripneustes, 



23. Plagionotus loveni, Cotteau. 



Cotteau, Echinid. tert., p. 41, pi. viii., f. 7, 8. 



