PLATE XIV. 
Figs. 1—1 d.—PERONIDELLA PISTILLIFORMIS, Lamouroux, sp. (Page 218.) 
Figs. 1—1 }.—Three separate colonies, showing variations in the mode of growth, and in the size 
and disposition of the individual spongites. Natural size. All from the Great Oolite at Hampton 
Cliffs, near Bath. Woodwardian Museum, Cambridge (Walton Collection). 
Fig. 1 c.—Part of a transverse section of the sponge-wall, showing the spicular structure of the 
fibres. Enlarged 60 diameters. 
_ Fig. 1 d.—Two tuning-fork spicules, imperfect, seen in the fibres of the same section. Enlarged 
200 diameters. 
Figs. 2, 2a.—PERONIDELLA TENUIS, Hinde. (Page 215.) 
Fig. 2.—The type of the species. Natural size. Inferior Oolite, Pea-grit, zone of Ammonites 
Murchisonx, near Cheltenham. British Natural History Museum. 
Fig. 2a.—Part of a transverse section; only traces of three-rayed spicules surrounded by 
crystalline fibres are shown. Enlarged 60 diameters. 
Figs. 3—3 c.—PrronipeLta Waxtont, Hinde, sp. nov. (Page 216.) 
Fig. 3.—An imperfect specimen, in which a lateral branch grows parallel with the main stem. 
Natural size. 
Fig. 3a.—An imperfect specimen, in which four divergent stems grow from a common centre. 
Natural size. 
Fig. 30.—An imperfect specimen in which several stumpy branches grow from the main stems. 
The surface in this specimen is partly smooth, with small perforations. Natural size. All these 
specimens are from the Great Oolite, Hampton Cliffs, near Bath, and they belong to the Walton 
Collection in the Woodwardian Museum, Cambridge. 
Fig. 3 ¢c.—A transverse section of the sponge-wall from the exterior to the cloacal tube, showing 
the disposition of the fibres. Enlarged 10 diameters. 
Figs. 4—4,f-—Prrontperta Mutasronntit, Sollas. (Page 215.) 
Figs. 4—4 6.—Three specimens, showing variations in form and mode of growth. Natural size. 
In fig. 4 a young specimen of the same species has attached itself to the surface of the larger, and in 
46a smali specimen of Holcospongia bella has fixed itself for support. The forms are all from the 
Inferior Oolite, Parkinsoni-zone, at Shipton Gorge, near Bridport, Dorset. Collection E. A. Walford. 
Fig. 4¢.—A vertical median section, showing the thickness of the wall, the form of the cloaca, the 
lower portion of which is filled by matrix, and the pores in its walls. Natural size. 
Fig. 4 d.—A portion of the outer surface of the sponge showing the disposition of the fibres. 
Enlarged 10 diameters. 
Fig. 4.e.—A portion of the wall of the cloaca showing the regular oval perforations. Enlarged 10 
diameters. 
Fig. 4f—A portion of a transverse section of the wall showing the fibres. Enlarged 60 diameters. 
The spicular structure is nearly wholly obliterated. 
