STEEPHINIA. — VEREUCOCCELIA. 97 



apart ; on the inner surface of the wall the canal-apertures, in some instances at 

 least, have a vertically linear disposition, and are somewhat larger than those of the 

 outer surface. 



The mesh-spaces are quadrate ; the distance from one nodal centre to another is 

 •16 mm. ; the spicular arms are apparently even, and •032 mm. in thickness. 



There is only a single fragmentary specimen in the collection, which distinctly 

 shows the canal and spicular structures of this species ; but from the same bed near 

 Dover there are large spreading masses of a sponge which has a similar mode of 

 growth, and probably belongs to this species, but the structural characters are 

 obliterated, so that it is impracticable to determine with certainty. 



Distribution. Grey Chalk : Dover. 



Strephinia reteformis, Hinde, n. sp. (Plate XXIII. figs. 4, 4 a.) 



Sponges either cup-shaped or growing in curved expansions. The wall is from 

 5^5 mm. to 7 mm. in thickness ; the outer surface is reticulate, with oval or sub- 

 polygonal canal-apertures, from 2 to 3 mm. in width. The walls between these 

 apertures are from -lb to 1 mm. in width. The interior surface is not exposed. 

 The spicular characters resemble those of the previous species. 



This species differs from S. convoluta by its thicker walls and the more open 

 characters of the reticulations of the outer surface. 



Distribution. Grey Chalk : Dover. 



Genus VEREUCOCCELIA, Etallon, 1860. 



Verrucoc(elia verrucosa. Gold/, sp. 



1833. Scyphia verrucosa, Goldf. Petref. 1 Th. p. 91, t. 33. f. 8, a, b, c, e. 

 1820. Spongus botryoides ?, Konig, Icones fossiles, p. 4, t. 7. f. 82. 

 1858. Scyphia verrucosa, Quenst. Der Jura, p. 668, t. 81. f. 86. 



1877. Verrucocoelia verrucosa, Zittel, Studien, I Ab. p. 47 ; Neues Jahrbuch, p. 356. 



1878. Mastospongia verrucosa, Quenst. Petref. Bd. 5, p. 146, t. 122. f. 3-6. 



Distribution. Upper Jura : Eanden ; Heuberg, Streitberg. 



Verrucoccelia gregaria, Quenst. sp. 



1858. Scyphia gregaria, Quenst. Der Jura, p. 668, t. 81. f. 85. 



1877. Verrucoccelia gregaria, Zittel, Studien, I Ab. p. 47 ; Neues Jahrbuch, p. 356, t. 2. f. 5. 



1878. Mastospongia gregaria, Quenst. Petref. Bd. 5, p. 148, t. 122. i. 8-10. 



Distribution. Upper Jura : Randen. 



Verrucoccelia tubulata, Toulmin Smith, sp. 



1848. Brachiolites tubulatus, T. Smith, Ann. & Mag. Nat. Hist. vol. i. p. 366, t. 15. f. 7. 

 Sponges growing in the form of a hollow cone, which is studded on all sides by 







