CAMEEOSPONGIA. 141 



This species has a great resemblance in outer form to G. {Scyphia) fimgiformis, 

 Goldf.* ; but the summit is less elevated, and the margins do not project over the 

 sides as in Goldfuss's form. The spicular structure of the mesh is also much larger 

 than in C. fimgiformis. The description and figures of C. {Manon) vionastoma, 

 F. A, Eoemerf, are too indefinite to permit of a comparison with the present species. 

 The specimen figured by Roemer cannot be distinguished from C. fimgiformis, Goldf. 



T. Smith's figure is not an altogether accurate representation of the original, which 

 has a slender stem, and the lateral walls are much closer arranged than represented. 



Distribution. Upper Chalk: South of England (coll. Mantell, T. Smith). 



Cameeospongia fungifoemis, Goldf. sp. 



1826-1833. Scyphia fungiformis, Goldf. Petref. 1 Th. p. 218, t. 65. f. 4. 



1877. Camerospongia fungiformis , Zitt. Studien, I Ab. p. 57; Neues Jahrbuch, p. 368. 



1878. Camerospongia fungiformis, Zitt. Handb. der Pal. p. 182, f. 97. 



The Museum only possesses microscopic fragments of the spicular mesh of this 

 species. The disposition of the mesh appears to be regular ; the octahedral nodes 

 are '35 mm. apart: thus the mesh-interspaces are smaller than in C. capitata. 



Distribution. Upper Chalk : Vordorf, Brunswick. 



Camerospongia turbinata, Giebel, sp. 



1851. Ptychotrochus turbinatus, Giebel, Jahresbericht des naturhist. Vereins in Halle, p. 53, 

 t. 2. f. 5. 



Microscopic fragments of the spicular mesh. 



Distribution. Upper Chalk : Galgcnburg, Goslar [coll. Zitt.). 



Cameeospongia campanulata, T. Smith, sp. 



1848. Cephalites campanulatus , T. Smith, pars, Ann. & Mag. Nat. Hist. vol. i. p. 289, t. 14. 

 £. 12, nouf. ]3. 



1877. Camerospongia campanulata, Zitt. Studien, I Ab. p. 57; Neues Jahrbuch, p. 368. 



1878. Cephalites campanulatus , Quenst. Petref. Bd. 5, p. 498. 



Sponges subgiobate in form, supported on a short cylindrical stem with divergent 

 rootlets. The summit is dome-shaped, with slight elevations and depressions ; the 

 central aperture is circular, and about 22 mm. in width. A typical specimen is 

 42 mm. in height and 54 in width, whilst the stem is only 8 mm. in length. 



A wide subcylindrical cloacal cavity, apparently destitute of a boundary wall, 

 extends from the summit to the base. The smooth membrane covers the summit 

 and the sides to nearly two-thirds the height of the sponge. The under surface 

 exhibits the reticulations of the wall-plaits with irregular interspaces. The convolute 



* Petrefaoten, 1 Th. p. 218, t. Go. f. 4. t Nordd. Kreido, p. 2, t. 1. f. 8. 



