PLATE XVII. 
Figs. 1—1 c.—Ho.cosPonGIA GLOMERATA, Quenstedt, sp. (Page 228.) 
Fig. 1.—Three simple individuals, attached to the surface of a specimen of Corynella Chadwicki. Natural size. 
Fig. 1a.—An ovate specimen, natural size. This and the preceding are from the Coralline Oolite, Plicatilis-zone, at 
Langton Wold, Malton, Yorkshire. (Collection Mr. S, Chadwick.) 
Fig. 1 6.—Portion of a transverse section, enlarged 10 diameters, showing the disposition of the fibres. 
Fig. 1 c.—Part of the same section, enlarged 60 diameters, showing the spicular structure of the fibres. 
Fig. 2.—Honcosponeia FLORICEPS, Phillips, sp. (Page 226.) 
Portion of a transverse section, enlarged 10 diameters, showing the disposition of the fibres. 
Figs. 3—3 4.—HoLcospon@ia SULCATA, Hinde, sp. nov. (Page 229.) 
Figs. 3, 3a.—A specimen, enlarged 3 diameters, showing the upper (8 a) and under (8) surfaces. 
Figs. 3 —3 e.—Two specimens, natural size, showing the upper (8c, 3 e) and the under (3, 3d) surfaces. 
Fig. 3.—Another specimen, showing the upper surface. Natural size. 
Fig. 3 g.—Another specimen viewed laterally, showing the thickness and the curvature of the wall. Natural size. 
All the specimens are from the Inferior Ootite, Parkinsoni-zone, at Shipton Gorge, near Bridport. (Collection Mr, E. A. 
Walford.) 
Fig. 34.—A portion of a transverse section of the fibres, enlarged 60 diameters. 
Figs. 4—4 d.—HoLcosponeia conTortA, Hinde, sp.nov. (Page 230.) 
Fig. 4.—A club-shaped specimen, enlarged 2 diameters, showing the grooved surface. 
Fig. 4@.— A small specimen, attached to a fragment of shell. Enlarged 4 diameters. 
Figs. 4.6, 4¢e.—Small pisiform specimens. Natural size. All the specimens are from the Inferior Oolite, Parkinsoni- 
zone, at Shipton Gorge. (Collection Mr. E. A. Walford.) 
Fig. 4.d.—A portion of the surface of the dermal layer, showing large three-rayed spicules and traces of smaller ones 
beneath. Enlarged 60 diameters. 
Figs. 5—5 c.—HOLcosPponaia LIASICA, Quenstedt, sp. (Page 231.) 
Figs. 5, 5 a.—The upper and under surface of the same specimen. Natural size. 
Fig. 54.—A compound specimen, in which one individual is partially overgrowing another. Natural size. The 
specimens are from the Inferior Oolite, Parkinsoni-zone, at Shipton Gorge. (Collection Mr. E. A. Walford.) 
Fig. 5 c.—Portion of a transverse section, showing the spicular fibres. Enlarged 60 diameters. 
Figs. 6-—6 e.—HoLcosPoNnGiA BELLA, Hinde, sp. nov. (Page 232.) 
Fig. 6.—A specimen showing the upper surface. Enlarged 3 diameters. 
Figs. 6 a—6 c.—The upper, lower, and side views of the same specimen. Natural size. 
Fig. 6d.—A specimen showing the upper surface. All the specimens are from the Inferior Oolite, Parkinsoni-zone, 
at Shipton Gorge, Dorset. (Collection Mr. E. A. Walford.) 
Fig. 6 e.—Portion of a transverse section, showing the spicular fibres surrounded by crystalline calcite. Enlarged 60 
diameters. 
Figs. 7—7 d.—HoLcospon@tia MITRATA, Hinde, sp. nov. (Page 232.) 
Figs. 7—7 6.—Three different specimens. Enlarged 4 diameters. From the Inferior Oolite, Parkinsoni-zone, at 
Shipton Gorge. (Collection Mr. E. A. Walford.) 
Fig. 7 c.—A portion of the outer surface, showing the ostia. Enlarged 10 diameters. 
Fig. 7d.—A portion of the dermal layer, showing some of the component three-rayed spicules. Enlarged 60 
diameters. 
Fig. 8.—MyYyRMECIUM BIRETIFORME, Sollas. (Page 233.) 
The type-specimen referred to this species, showing the summit. Natural size. From the Inferior Oolite, Parkinsoni- 
zone, at Burton Bradstock. (Collection Rey. G. F. Whidborne.) 
Figs. J—9 c.—HLASMOSTOMA PALMATUM, Hinde, sp.nov. (Page 243.) 
Figs. 9, 9 a.—Two small fan-shaped specimens. Natural size. In Fig. 9 the dermal layer has been removed; in 9 @ 
the under or non-oscular surface is shown. 
Fig. 96.—A lobate specimen, the surface partially covered with the dermal layer. Natural size. All the specimens 
are from the Great Oolite, Hampton Cliffs, near Bath. Woodwardian Museum, Cambridge (Walton Collection). 
Fig. 9c.—A portion of a transverse section, showing the spicular structure of the fibres. Enlarged 60 diameters. 
