242 BRITISH JURASSIC SPONGES. 
circular to oval in form, ‘6 to 1 mm. in width, with slightly elevated margins ; they 
are irregularly placed, and vary in number in different specimens. In some 
specimens the skeletal fibres are nearly even with the apertures. 
The skeletal fibres are stout; they range from ‘08 mm. to ‘17 mm. in 
thickness ; the surface layer, and that round the cloacal tube, is specially thick- 
ened, and reaches ‘25 mm. in transverse section. The spicular structure is 
very obscurely shown; there are traces of three-rayed spicules and of rod-like 
forms, which may be portions of tuning-fork spicules, but they are too frag- 
mentary and indefinite to be measured or figured. The specimens range from 
3°5 mm. to 6°5 mm. in height, and from 3 mm. to 45 mm. in diameter. They 
are fairly common. 
In form this species is nearest allied to Hudea perforata, Quenstedt, sp. (‘ Der 
Jura,’ p. 698, pl. lxxxiv, figs. 26, 27; and ‘ Petref. Deutschl.,’ vol. v, p. 192, 
pl. exxiv, figs. 22—28), but it is much smaller, and the skeletal fibres are more 
delicate. I have named it after Mr. EK. A. Walford, F.G.S., who discovered this 
and the numerous other forms of Calcisponges herein described from Shipton 
Gorge. 
Distribution.—Inferior Oolite. Parkinsoni-zone at Shipton Gorge, near 
Bridport. (Coll. Mr. EH. A. Walford.) 
50. Hupra Pisum, Quenstedt, sp. Plate XIX, figs. 2—2b. 
1878. Orisponeata pisuM, Quenstedt. Petref. Deutschl., vol. v, p. 196, pl. exxiv, 
figs. 35, 36. 
1878. Evpra pisum, Zittel. Studien, Abth. 3, p. 117. 
Sponges small, simple, conical or subspherical, sometimes with constrictions 
of growth, attached either by a narrow or an expanded base, summits conical, 
with oscule about ‘7 mm. wide. Outer surface nearly entirely covered with 
dermal layer, in which there are circular apertures, about °5 mm. wide, at the end 
of short tubular extensions. The specimens range from 5 mm. to 9 mm. in 
height, and from 3 mm. to 5 mm. in width. The fibres appear to be finer than in 
H. Walfordi, but owing to scarcity of material I have not been able to make 
sections. This species differs further from H. Walfordi in form, in the smaller size 
of the apertures, and in their tubular extensions. 
Distribution.—Inferior Oolite. Parkinsoni-zone at Shipton Gorge, Dorset. 
(Coll. Mr. E. A. Walford.) Also from the Upper or White Jura at Bollert, 
Balingen, Germany (Quenstedt). 
