66 



COELENTERATA— PORIFERA 



PHYLUM II 



or less regulär; outer layer thickened ; roots present. Common in Middle 

 and Upper Cretaceous. 



Fia. 74. 



PachyteicMsma carteri Zittel. Upper 

 Jurassic ; Hohenpölz, Franconia. a, 

 Sponge, 1/2 natural size ; b, Skeleton, 12/j. 



Fig. 75. 



VentricuUtes striatvs Smith. Qnadratenkreide ; Linden, 

 near Hanover. a, Sponge, 1/2 natural size ; b, Transverse 

 section, 1/1 ; c, Skeleton, 12/j. 



Fio. 76. 



CoeloptycTinim agaricoides Goldf. Upper Cretaceous ; Vordorf, near Brunswick. A, Top view. li, Profile. 



C, Under surface, 2/3 natural size. D, Skeleton, 60/j, 



Schizorhabdus, Bhizopoterion, PolyllasUdium Zittel ; Sporadoscinia Pomel ; 



