148 



INVERTEBRATA. 



or projecting as prominent craters or tubes (var. tuhifera, Kpng.)] 

 Two specimens in the Woodwardian Museum have a well-marke( 

 expanded, flattened, and everted margin, and these specimen^ 

 further agree in being of stouter build than is usual in the ordinal 

 forms thus agreeing with the type of E. marginata. 



The vermiculate structure of the sponge is well seen over th< 

 outer surface, but on the oscular face the tissue is denser, forming 

 an * epitheca ' which is however less developed than in the Farring^ 

 don sponges. 



Localities. Upware, Brickhill, Farringdon. 



iV. Europe. Schoppenstedt (Hils conglom.), Dresdei 

 (Planer) ? 



S. Europe. Ardennes, Arzier (Vaud). 



Elasmostoma pezisa, Goldfuss. 



Manon pezisa, Goldfuss, Petr. Germ,, I., pi. I., figs. 7, 8 (not th.< 



other figures). 



Elasmostoma consobrinum, d'Orb., Geinitz, and others. 

 Localities. Brickhill, Upware, Farringdon. 



CORYNELLA NODOSA, sp. nov, 



(Plate VIII., fig. 4.) 



Description. Sponges more or less pyramidal, rarely cylin- 

 drical ; attached by a broad base ; sessile, or mounted upon a shoi 

 neck. 



Walls very thick, composed of an uniform, coarse vermiculat 

 tissue, leaving only a narrow cylindrical central cloaca. 



The system of canals opening into the central cloaca is bui 

 imperfectly developed. 



Osculum terminal, central. 



A simple smooth area forms the terminal cone around th( 

 osculum, but below this the surface is raised into prominent, coars( 

 knobs and foldings. 



Locality. Brickhill. 



