418 Frederick ChapriKiti : Pijrltized IS'poiKjes. 



Z. var. cylindrica, Court. The last-named author recorded his 

 variety from the Cenomanian (Lower Chalk) of Sauuiur. Maine- 

 et-Loire, France. 3 



It is worth noting, as further stratigraphical evidence of the 

 homotaxy of the Desert Sandstone with the Upper Cretaceous 

 elsewhere, that both Siplionia tulipa and its variety n/Uudrica 

 occur in Europe in the latter series. 



Explanation of Plate LXXXII. 



Fig. 1. — Pyritized sponge, cf. Siphonia tulipa, Zittel. a, 



Lateral aspect ; h, apical aspect. 

 Fig. 2. — Ditto, cf. S. tulipa, Zittel, var. rylindrica, Courtillier. 



a, lateral aspect ; h, apical aspect. 



Figures slightly less than natural size.. 



1 Courtillier, A. " Epoiiffes fossiles des sables du terrain Crotacf superieur des envi- 

 rons de Saumur, etage Senonien de D'Orbigny " (Extrait des Aniiales de la Societe 

 Linneene de Maine-et-Loire), 1861. 



