PLATE XV. 
Figs. 1—1c.—PrronIpELta rEcTA, Hinde, sp. nov. (Page 217.) 
Figs. 1, 1 a—Two of the compound forms, natural size. The transverse groove in fig. 1 is the 
impress of an Echinoderm spine to which the sponge has been attached. From the Lower Calea- 
reous Grit at Suffield, near Scarborough. (Coll. Mr. 8S. Chadwick.) 
Fig. 14.—A portion of the outer surface, showing the interspaces between the fibres. Enlarged 
10 diameters. 
Fig. 1¢.—A portion of a transverse section showing the fibres and traces of three-rayed spicules. 
Enlarged 60 diameters. 
Figs. 2—2 g.—PERONIDELLA NANA, Hinde. (Page 218.) 
Figs. 2, 2a.—A specimen, natural size, and enlarged 4 diameters. 
Figs. 24—2e.—Different specimens, showing variations in form and size. Inferior Oolite, 
Parkinsoni-zone, at Shipton Gorge, Dorset. (Coll. Mr. E. A. Walford.) 
Fig. 2f—A portion of the outer surface showing the irregular interspaces between the fibres. 
Enlarged 10 diameters. 
Fig. 2g.—A portion of a section showing the fibres; the spicular structure has been obliterated. 
Enlarged 60 diameters. 
Figs. 83—8 h.—CoRYNELLA LYCOPERDIOIDES, Lamz., sp. (Page 220.) 
Figs. 83—8c.—Four specimens of the sponge. Natural size. Fig. 3a is partially lobate, and 
the stem is wanting; in fig. 34 the stem has also been partially broken off. All the specimens are 
from the Cornbrash at Langton Herring near Weymouth, and they belong to the Woodwardian 
Museum at Cambridge. 
Figs. 3 d, 3 e.—Portions of transverse and longitudinal sections, showing the disposition and the 
spicular structure of the fibres. Enlarged 60 diameters. 
Figs. 3f, 8g.—Tuning-fork spicules; in fig. 3fas seen in their natural position in the fibres. 
Fig. 8g is a single spicule, imperfect, from the same microscopic section. Enlarged 200 diameters. 
Fig. 3 h.—A sagittate four-rayed spicule from the same sponge. Enlarged 100 diameters. 
Figs. 4—4 6.—CorynEtia ELEGANS, Hinde, sp. nov. (Page 221.) 
Figs. 4,4a.—A simple individual and a compound specimen. Natural size. From the Great 
Oolite at Hampton Cliffs, near Bath. Woodwardian Museum, Cambridge, Walton Collection. 
Fig. 46.—A portion of a transverse section, showing the spicular structure of the fibres. Enlarged 
60 diameters. 
Figs. 5, 5 a.—HustpHonELLA PROLIFERA, Hinde, sp. nov. (Page 219.) 
Fig. 5.—An end view of the type-specimen, showing the mode of growth. Natural size. Great 
Oolite, near Bath. British Natural History Museum. 
Fig. 5 a.—Portion of a transverse section of one of the spongites, showing the spicular structure 
of the fibres. Enlarged 60 diameters. 
Figs. 6, 6 a— CoryNenia CuapwicKt, Hinde, sp. nov. (Page 228.) 
Two small examples of this species. Natural size. From the Coralline Oolite, zone of Ammonites 
plicatilis, at Langton Wold, near Malton, Yorkshire. (Coll. Mr. 8. Chadwick.) 
