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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



9 



A « 



% 



10 





12 



13 



Figs. 8-13. — 8, 9, Clypeus rostrahis Agassiz : 8, Apical system X 8, and 9, phyllode of ambuh 

 crum III, X 8, of specimen in the Naturhistorisches Museum, Basel, Switzerland, from i\ 

 Middle Jurassic (Bathonian) Variansschichten, Aargauer, Jura, Switzerland. 10, Clypei 

 alius M'Coy: Phyllode of ambulacrum III of specimen in Ecole National Superieure df 

 Mines in Paris, from Dorsetshire, England, X 10. 11-13, Clypeus agassizi (Wright) : 11, Phy 

 lode of ambulacrum V of specimen in Museum of Comparative Zoology, Harvard, from Midd' 

 Jurassic (Bathonian), Upper Inferior Oolite, Broad Windsor, Dorset, England, X 4; 12, adapicc 

 view of interambulacrum 5, showing lack of catenal plates in same specimen, X8; 13, adapicc 

 view of interambulacrum 5 showing catenal plates in USNM Springer Collection S4984, froi 

 same locality, X 8. 



