FOREIGN JURASSIC MAGNOTIAS. 195 



stome slightly notched into ten nearly equal-sized lobes. This species is less granular 

 than the preceding, from which it likewise differs in having smaller tubercles at the base. 



Formation. — Inferior beds of " l'etage Corallien" at Chatel-Censoir(Yonne), d'Eccomoy 

 (Sarthe). 



Collection. — M. Cotteau : very rare. 



Magnotia decorata, Agassiz. Syn. Eucosmus decoratas, Agassiz. Cat. raisonne, Ann. 



Sc. Nat., 3 me serie, tome vi, p. 356, pi. 15, figs. 12, 13. 



Test small, hemispherical, depressed ; ambulacra so extremely narrow that there is 



o 



o 



only space for a single row of tubercles, arranged in a zigzag line, thus o ; inter- 



ambulacra wide, with eighteen rows of tubercles, which do not form vertical and horizontal 

 series, but are arranged in oblique lines ; the zigzag row of tubercles in the ambulacra 

 results from the alternate plates in the area carrying only one tubercle on each. 



Formation. — Argovien (Formation y of Quenstedt), Lsegern, Baden near Zurich, Lochen 

 (Wurttemberg). 



Collections. — Museums Zurich, Neuchatel, Bale. 



26 



