M. K. A. Zittel on Fossil Hexactinellida. 509 



Cephalites, Toulmin Smith (pars)|. 

 Ann. & Mag. Nat. Hist. 1848, pp. 46, 279. 



Like Ventriculites J but with the upper margin of the funnel 

 truncated, somewhat thickened, and coated with finely porous 

 siliceous membrane. 



f Cepkah'tes longitudinaUs, T. Smith, I. c. pi. xiv. 1. 



fC. gitttatus^ id. ibid. 2. 



fC. paradoxus J id. ibid, 3. 



Lepidospongia, Eom. 



Spongit. p. 9. 



External form like Ventriculites] wall thin, meeandrically 

 folded, on the inside with longitudinal furrows. Outer sur- 

 face coated with a dense siliceous membrane, which is inter- 

 rupted by numerous transverse fissures running in a hori- 

 zontal direction. Skeletal structure as in Ventriculites. 



Lepidospongia rugosa^ Schliit. Spongitariensch. des Miin- 

 sterl. i. 1-4. 



Family 6. Staurodermidse. 



Cypellia, Pomel (emend. Zitt.). 

 Paleont. de TOran, p. 76. 



Top-shaped, basin-shaped, or branched, thick -walled, with- 

 out root. Lattice-tissue irregular ; crossing-nodes with aper- 

 tures or octahedrally perforated. Radial canals generally 

 curved, perforant, with roundish or elongated, irregularly dis- 

 tributed ostia on both sides. Outer surface with large cruci- 

 form sexradiates, of which the outwardly directed arms are 

 aborted. These larger spicules are irregularly cemented to one 

 another by either lamellar or filiform siliceous bridges, or they 

 lie in a perforated siliceous membrane which coats the whole 

 surface. 



ScypMa rugosa^ Goldf. iii. 6. 

 {Spongites dolosus, Quenst. p. 671.) 



Staueodeema, Zitt. 



Polyzoic. Funnel- or platter-shaped, spread out above, 

 with a shallow central cavity. Wall thick. On the inner 

 {i. e. upper) surface with numerous apertures of depressed 



X I am acquainted with this genus (which, moreover, is understood 

 here in a much narrower sense than by Toulmin Smith) only from the de- 

 scription and figures. 



