228 BRITISH JURASSIC SPONGES. 
35. Hotcosronera pouita, Hinde, sp. nov. Plate XVI, figs. 5—6 e. 
1883. STELLISPONGIA coRALLINA (in part), Hinde. Brit. Foss. Sponges, p. 186, 
pl. xxxv, fig. 3a. 
Sponges simple or compound. ‘The simple forms are subspherical, attached 
either by a small pedicle or directly by the basal surface ; they range from 8 mm. 
to 15 mm. in diameter. The compound specimens grow in irregular compact 
masses of from three to five individuals, which are usually amalgamated together. 
The dermal layer is very slightly developed, and when present is limited to the 
basal portion. The summits have a slight central depression, from which 
numerous open shallow furrows about °75 mm. in width radiate down the sides. 
The radial canals have a similar width to the surface furrows. The fibres have a 
very open disposition; they vary from ‘05 mm. to ‘15 mm. in thickness. The 
rays of the axial spicules range from ‘16 mm. to ‘43 mm. in length: the marginal 
filiform spicules are few comparatively, hence the fibres are much more delicate 
than in the preceding species. 
From Holcospongia floriceps this species is distinguished by its smaller size, 
different form, and the more delicate fibres. It more nearly resembles H. 
glomerata, Quenstedt sp., but the fibres are finer. 
This species is abundant in the Lower Coral Rag of Suffield and Hackness, in 
the same beds with H. floriceps. The simple spherical forms are more common 
than the compound ones. Simple forms also occur rarely in the Great Oolite of 
Hampton Cliffs, near Bath. 
Distribution.—Great Oolite, Hampton Cliffs, near Bath (Woodwardian Museum, 
Cambridge) ; Lower Coral Rag, Perarmatus-zone at Hackness and Suffield, near 
Scarborough, Yorkshire (Coll. Mr. J. F. Walker, Mr. 8. Chadwick); Coral Rag, 
Lyneham, Wiltshire. 
36. Hotcosponeaia GLomERATA, Quenstedt, sp. Plate XVII, figs. 1—1lc. 
1858. SPoNGITES GLOMERATUS, Quenstedt. Der Jura, p. 695, pl. Ixxxiv, figs. 
i), at. 
1840-47, CnNrEMIDIUM sTELLATUM, Michelin (non Goldfuss). Icon. Zooph., p. 115, 
pl. xxvi, fig. 8. 
1878. Sponarres GLoMERATUS, Quenstedt. Petref. Deutschl., vol. v, p. 228, 
pl. exxv, figs. 26—36, 38, 40—54. 
1878. SrELLISPONGIA GLOMERATA, Zittel. Studien, Abth. 3, p. 130. 
1878. — — Hinde. Cat. Foss. Sponges, p. 187. 
