334 M. K. A. Zittel on Fossil Lithistidce. 



All the species are from the Middle and Upper Creta- 

 ceous. 



1. Spongia plana, Phill. Geol. Yorksh. pi. i. fig. 1. Upper 

 Chalk. 



2. Spongia capitata, Phill. ib. pi. i. fig. 2. Upper Chalk. 

 *3. Ghenendopora explanata, Rum. Spongit. xvi. 3. Seno- 



nian. 

 *4. Scyphia Mantelli, Goldf. Ixv. 5. Senonian. 



5. Seltscotkon Roemeri, Pom. sp. Senonian. 

 Cupulosponffia Mantelli, Rom. Spongit. xvii. 6 (non Goldf.). 



6. Cupuhspongia gigantea, Rom. Spongit. xviii. 1. Seno- 

 nian. 



7. Ctipulosjwngia marginattty Rom. Kr. ii. 7. Senonian. 

 *8. Ocellaria suhtilis, Rom. Spongit. vii. 5. Senonian 



(Quenstedt's pl. cxxxiii. figs. 4-7 represent species of Selis- 

 cothon) . 



Chenendopora, Lamx. 



(Expos. M.5tb. p. 77, pl. Ixxv. figs. 9, 10.) 



Ghenendopora p. p., auct. 



Jerea p. p., Mich. 



Bicnpula, Platispongia, Cupulospongia, Oom't. 



Sponge cup-, funnel-, or basin-shaped, thick-walled, gene- 

 rally more or less long-stalked, with a root-like branching 

 base, rarely without stalk- Upper margin truncate or rounded, 

 broad. Inner surface with depressed, irregularly distributed 

 oscula, from which simple, straight or bent canals penetrate 

 the thick wall, and terminate close to the opposite surface. 

 Below, the canals become more and more oblique, and finally 

 vertical tubes, which traverse the whole stalk and are con- 

 tiimed into the roots. Outer surface sometimes with a finely 

 porous, dense, wrinkled covering-layer. 



The skeleton consists of branching corpuscles of consi- 

 derable size, almost entirely covered with wart-like tubercles. 

 The root-like ends of the neighbouring elements are interlaced, 

 and form at the surface the above-mentioned covering-layer. 

 In the stalk, the surface of which is usually furrowed longitu- 

 dinally, tlie skeletal corpuscles are much elongated. Large 

 baciilar spicules are tolerably numerous. 



Lamouroux's genus has been made to include sponges of 

 very different structure. The type species [C. fungiformis, 

 Lamx.), as has been proved by Michelin, is not from the 

 Jurassic of Caen, but from the Upper Cretaceous deposits of 

 Normandy. It occurs with allied forms, roughly silicified, in 

 Touraine, whence Courtiller has described a great number of 



