452 
DR. G. J. HINDE ON BEDS OF SPONGE-REMAINS IN THE 
Figs. 15, 15a. Discodermia sinuosa, Carter. Spicules of the dermal layer of this 
existing species, for comparison with those of the fossil lithistids. From 
the Gulf of Manaar. Drawn from examples of the typical species, kindly 
presented to the Author by Mr. H. J. Carter, F.R.S. X 60 diameters. 
PLATE 45. 
Figs. 1—1c. Carterella, sp. Skeletal spicules.—From near Warminster. X 40 dia¬ 
meters. 
Figs. 2-2k. Mastosia neocomiensis. Various forms of skeletal spicules.—From Hasle- 
mere, Flaldon ; near Warminster, X 40 diameters. 
Figs. 3, 4-4 d. Chenendopora, sp. Skeletal spicules probably of more than one 
species.—Blackdown, Tilburstow Hill, near Warminster. X 60 diameters. 
Figs. 5, 5a, b. Rciyadinia, sp, Skeletal spicules.—Haslemere, near Warminster. X60 
diameters. 
Figs. 6, 6a-/. Siphonia, sp. Skeletal spicules probably of different species.—Black- 
down, near Warminster. X 60 diameters. 
Figs. 7, 7a, b. Fragments of the skeletal mesh of a species of Hexactinellid.—Hasle¬ 
mere. X 60 diameters. 
Fig. 8. Fragment of the skeletal mesh of another species.—Sevenoaks. X 60 dia¬ 
meters. 
Fig. 9. Fragment of the skeletal mesh of another species in which the spicular nodes 
are octahedral.—Merstham. X 60 diameters. 
Figs. 10, 10c. iStauractinella, sp.—Blackdown, Merstham. X 60 diameters. 
Figs. 11, 11a. Gompliites Parfitti, Carter. —Blackdown, Haldon. X 60 diameters. 
Fig. 12. Acerate spicule. —From near Warminster. X 560 diameters. 
Fig. 13. An imperfect spicule, the walls of which have been partially dissolved away, 
whilst the inhlled interior canal has remained intact.—From Blackdown. 
X 40 diameters. 
Figs. 14, 14a. The infilled canals of a spicule of Geodites and one of Pachastrella, 
which have remained after the walls of the spicule have been entirely 
dissolved away.—From Chert, Penzlewoocl. X 40 diameters. 
Figs. 15, 15c. Residuary spicules, in which the colloidal silica has been removed, and 
the form of the spicule is retained in glauconite or allied silicate. These 
spicules are frequently contracted and distorted in a peculiar manner.— 
From Ventnor, and near Warminster. 
Fig. 16. A spicule of Geodites, in which the outer walls have been removed, and the 
infilled canal is surrounded by discs or globules of colloid silica.—From 
siliceous material in cavities in chert, near Warminster. X 150 diameters. 
