58 



COELENTERATA— PORIFEEA 



PHYLUM II 



Spongitenkalk of South Germany, the skeletons being almost invariably 

 replaced by calcite. C. rinmlosum Goldf. According to Hinde also present 

 in the Carboniferous Limestone of Ireland. 





Fig. 60. 



Cnemidiastrum, stellatum (Goldfiiss). Upper Jurassic Spongiten- 

 kalk ; Hossingen, Wiirttemberg. a, Sponge, V2 natural size ; b, 

 Vertical tangential section, showing radial canals In vertical clefts ; 

 c, Skeletal elements, 6"/^. 



Fig. 61. 



Skeleton of Jercica polystovia 

 (Roem.). Upper Cretaceous ; Alilten, 

 Hanover. BO/j, 



Hyalotragos Zittel. Bowl-, plate- or funnel-shaped, with short peduncle. 

 Depression in summit perforated by the ostia of numerous short canals. ■ Ex- 

 ternal surface finely perforate, or covered by a smooth or wrinkled dermal 

 layer. Skeletal elements irregular, Avith numerous branches beset with points, 

 but with few spines. Very abundant in Upper Jurassic Spongitenkalk. H. 

 patella (Goldfuss). 





Fig. 02. 



Cheiic)idoponifungiformisLa,mx. Senonian ; 

 Chatellerault, Touraine. ^/j natural size. 



Fig. 63. 



Verruculina auriformis (Roemer). Quadratenkreiiie; 

 Linden, near Hanover. 2/3 natural size. 



Flatychonia Zittel. Leaf- or ear-shaped, irregularly undulating, covered on 

 both surfaces with fine pores. Skeletal elements resembling those of Hyalo- 

 tragos. Upper Jurassic. P. vagans (Quenstedt). 



Jereica Zittel (Fig. 61). Sponge cylindrical, turbinate,"pyriform or club- 



