64 M. K. A. Zittel on Fossil Caldspongice. 



9. Eudea corallina, Etal. Actes Soc. Jur. d'Emul. 1860, 

 p. 147, %. 13. 



10. Ependea elongata, From, et Pill. Coll. cle Lcm. pi. xii. 

 figs. 5, 6. Titlionian. 



11. Stegendea Ptlleti, From, et Pill. ib. pi. xiii. fig. 8. 

 Titlionian. 



Colospongia, Laube. 



(Fauna von St. Cassian, p. 17, Taf. i. fig. 10.) 



Manon p. p., Miinst., Klipst. 

 A?norphospongia p. p., D'Orb. 



Sponge cylindrical, clavate, sometimes branched, built up 

 of globular or annular segments, which are indicated exter- 

 nally by deep constrictions. Surface coarsely porous, the 

 lower segments sometimes clothed with a smooth, dense 

 dermal layer. Vertex convex, with the small circular osculum 

 of a narrow central cavity, which passes through the whole 

 sponge-body. 



The segments internally are occupied by an extremely 

 loose anastomosing fibrous tissue, which is somewhat con- 

 densed at the walls. Canal-system wanting. 



I have modified Laube's diagnosis in accordance with a 

 well-preserved branching specimen from the Seeland Alp, 

 which in transverse section shows a central cavity, and no- 

 where exhibits an epitheca. Colospongia unites Eudea with 

 Verticillites. From the latter the present genus differs by 

 possessing imperfectly developed transverse floors, and also 

 bv the circumstance that the segments are not hollow inter- 

 nally, but filled with loose tissue. The only species is from 

 the Alpine Trias : — 



Colospongia dubia, Laube, I. c. Taf. i. fig. 16. 



Manon dubium, Miinst. Beitr. iv. Taf. i. fig. 11. 

 Manon perfusion, Klipst. CEstl. Alp. Taf. xix. fig. 14. 



Verticillites, Defrance. 



Verticillites (Ellis), Defr., D'Orb. 



Sci/phia, Goldf. 



Verticillopora, Blainv., Sharpe (non M'Coy). 



Verticillocceliu, From. 



Verticillites, Cystopora, Pom. 



Verrucospongia p. p., Laube. 



Sponge simple or bushy. Isolated individuals cylindrical 

 or clavate, frequently with horizontal constrictions at the 

 surface. Vertex with a circular osculum. The whole sponge- 

 body built up of thin-walled hollow rings, each of which fits 

 upon the preceding one in such a manner that the horizontal 

 or arched cover of the first forms at the same time the floor of 



