CRATICULARIA FOLIATA. 199 
subquadrate meshes are about ‘3 mm. in length. The original skeleton has been 
wholly replaced by calcite. 
Distribution.—Inferior Oolite. Parkinsoni-zone in the Cliff-section at Burton 
Bradstock, Dorset. (Walton Coll., Woodwardian Museum.) It also occurs in 
the White, or Upper, Jura of Wiirtemberg, and at Randen, near Schaffhausen. 
5, CRATICULARIA FOLIATA, Quenstedt, sp. Plate X, fig. 6—6 b. 
1878. Trxrrsponeia FoLtata, Quenstedt. Petref. Deutschl., vol. v, p. 64, p. exvil, 
figs. 7 a, 7, x. 
1883. LrproPHRAGMA FRAGILE, Sollas. Quart. Journ. Geol. Soc., vol. xxxix, 
p- 545, pl. xx, figs. 10, 11, lla. 
Entire form of sponge unknown, probably platter-shaped; the specimens 
consist of irregular broken fragments of a delicate plate-like wall, from 30 mm. to 
50 mm. across, and from 2 mm. to 3 mm. in thickness. Both surfaces of the wall 
exhibit small, nearly circular ostia, about ‘4 mm. wide, separated by interspaces 
of nearly equal width. The ostia are very regularly disposed so as to give an 
appearance of a minute quadrate reticulation to the surface. The canals extend 
at right angles nearly through the wall, and terminate blindly. The skeletal 
meshwork is very regular (Pl. X, fig. 6); the distance between the nodes is 
about *125 mm., measured in thin sections of the wall. 
These fragments agree so closely with those described and figured by 
Quenstedt, from the Upper Jura, below Miihlheim on the Danube, that there can 
be no doubt they belong to the same species. ‘This author mentions that flattened 
fragments of the wall, a foot in width, occur in the shaly strata of this locality, 
so that the sponge must have reached considerable dimensions. Prof. Sollas did 
not adopt Quenstedt’s name for this species, because, as he states, no magnified 
representation of the skeletal network was given; but, as a matter of fact, this 
has been figured by Quenstedt (1. ¢., fig. 7 ~) and it corresponds closely with that 
of the British specimens. 
Prof. v. Zittel has called attention to the fact that the spicular structure of the 
sponges with small ostia, which Quenstedt has ranged under Textispongia, is of a 
precisely similar character to that of the sponges with large ostia, placed by the 
same author under Clathrispongia, and that, consequently, both these divisions 
can be well included under Craticularia (‘ Neues Jahrbuch,’ 1877, p. 708). 
Distribution.—Inferior Oolite. Parkinsoni-zone in the Cliff-section at Burton 
Bradstock (Coll. Rev. G. F. Whidborne) ; and at Shipton Gorge (Coll. Mr. EH. A. 
