124 M. K. A. Zittel on Fossil Calcispongice. 



1. Myrmecium hemisphcericum, Goldf. Taf. vi. fig. 12. 



Cnemidium rotula, Goldf. Taf. vi. fig. 6. 



Spongites rotula, Quenst. Petr. Taf. cxxvi. figs. 1-41. 



a. var. biretiformis, Querist. I. c. figs. 2-4, 6, 7. 



b. var. foliata, Querist. 1. c. fig. 5. 



c. var. cylindrata, Querist. I. c. figs. 8-10. 



d. var. coniformiSj Quenst. I. c. figs. 11—13. 



e. var. pedicnculata, Quenst. I. c. figs. 14-18, 30, 31. 



f. var. longiceps, Quenst. I. c. figs. 21-26. 



2. Spongites indutus, Quenst. Petr. Taf. cxxvi. figs. 42-46. 



3. Spongites circumsejrtus, Quenst. ib. Taf. cxxvi. figs. 55- 

 57. 



? Hippalimus, Lamx. 

 Hippalimeuclea, From, (non Hippalimus, D'Orb., Rorn. &c). 



Sponge mushroom- or umbrella-shaped, pedunculate ; ver- 

 tex with a wide funnel-shaped central cavity. The sloping- 

 sides of the conical umbrella set with oscula. Lower surface 

 of the umbrella, stem, and wall of the central cavity smooth, 

 without oscula. 



I know this genus only from figures, and am consequently 

 uncertain about its systematic position. Possibly it belongs 

 to the order Lithistidse. 



The single species, //. lobatus, Lamx., Exp. Moth. pi. lxxix. 

 fig. 1, is from the Cenonianian of Villers in Calvados. 



Lymnoeea, Lamx. 



Mamittipora, Bronu. 

 Lijmnoreotheles, From. 

 Lymnorea, Flacorea, Pom. 



Sponge nodular, consisting of verruciform, mamilliform, or 

 globular individuals, which are grown together and covered 

 by a common, thick, and wrinkled basal epidermis. At the 

 vertex of each individual there is a simple, sometimes radiate, 

 and not very deep osculum. 



Of the typical species of this genus I possess only insuffi- 

 cient material, which gives me no certain information as to 

 the nature of the oscula and the depth of the stomachal cavity. 

 In a specimen from Ranville [ have made sections of several 

 of the round heads : the shallow oscula, into which a number 

 of radial canals opened, then soon disappeared ; but there re- 

 mained, instead of them, upon the cut surface, some scattered 

 round sections of fine vertical canals; and that these traversed 

 the whole sponge-body appears from the fact that on cutting 

 through the base of the common peduncle a bundle of fine 

 canal-sections Avas visible in the centre. The oscula conse- 



