PLATE X. 
Figs. 1, 1 a—Tremapictyon sparsum, Hinde, sp. nov. (Page 195.) 
Fig. 1.—The upper portion of a large cup-shaped example, showing the inner 
surface of the wall. Natural size. From the Inferior Oolite, Parkinsoni-zone, 
Burton Bradstock, Dorset. Walton Collection, Woodwardian Museum, Cam- 
bridge. 
Fig. 1 a.—Portion of a thin section of the same taken at right angles to the 
surface, showing the spicular structure, now replaced by calcite. Hnlarged 
50 diameters. 
Figs. 2, 4.—Tremapiotyon ncertuM, Hinde, sp. nov. (Page 196.) 
Fig. 2.—Portion of a thin section, showing the spicular structure. Enlarged 
50 diameters. 
Fig. 4.—A cup-shaped specimen. Natural size. From the Inferior Oolite, 
Parkinsoni-zone, Burton Bradstock. (Collection G. J. Hinde.) 
Fig. 3.—TReEMaDICTYON RETICULATUM, Goldfuss, sp. (Page 196.) 
A fragment of the spicular mesh of this species, retaining the original 
siliceous structure. Enlarged 50 diameters. From a specimen from the Upper 
Jura of Streitberg. 
Figs. 5, 5a.—S?aAURODERMA EXPLANATUM, Hinde, sp. nov. (Page 202.) 
Fig. 5.—A fragment of a platter-shaped specimen, showing the oscular 
apertures of the upper or inner surface of the wall. Natural size. From the 
Inferior Oolite, Parkinsoni-zone, Burton Bradstock. (Collection Rev. G. F. 
Whidborne). 
Fig. 5 a—Portion of a transverse section through the wall of the same, 
showing the spicular structure. Enlarged 50 diameters. 
Figs. 6—6 b.—CRaticuLaRiA FOLIATA, Quenstedt, sp. (Page 199.) 
Fig. 6.—A fragment of the plate-like wall, showing the outer surface. 
Natural size. From the Inferior Oolite, Parkinsoni-zone, at Burton Bradstock. 
(Collection Rev. G. F. Whidborne.) 
Fig. 6a¢.—Another fragment of the same, showing the thickness of the wall. 
Fig. 6b.—Portion of a transverse section of the wall, showing the spicular 
structure now replaced by calcite. Hnlarged 50 diameters. 
