NO. 3 



CASSIDULOID ECHINOIDS — KIER 



49 



28 



27 



29 



26 



'iGS. 25-29. — Pygunis (Mepygunis) depressiis Agassiz : 25, Apical system of Cotteau's (1869, 

 31, figs. 1-3) figured specimen from Ranville, France, in the Ecole National Superieure des 

 les, Paris, X 15. 26, 27, Astrolampas productits (Agassiz) : 26, Apical system of specimen 

 he Museum of Comparative Zoology, Harvard, Lower Cretaceous (Neocomian), Mormont 

 5 Lasarraz, Switzerland, X 8 ; 27, phyllode of ambulacrum I of specimen in the Lambert 

 lection (No. 467), Sorbonne, Paris, from the Lower Cretaceous (Neocomian) at Morteau 

 Dubs), France, X 8. 28, Pseudopygurus letteroni Lambert: Apical system of specimen from 

 Jurassic (Sequanian) at Bailly, Yonne, France, in the Lambert Collection, Sorbonne, Paris, 

 5. 29, Nitcleolites orbicularis (Phillips) : Adoral interambulacral plates in specimen in the 

 gwick Museum, Cambridge, England, from the Cornbrash at Scarborough, Yorkshire, Eng- 

 1, X II- 



