442 
DR. G. J. HINDE OX BEDS OF SPONGE-REMAINS IN THE 
greensand at Warminster and Merstham, and it has been figured from the upper chalk 
of Westphalia (Zittel). 
Another globostellate (figs. 2 e,f) has a spherical body with stout, conical spines 
projecting from its surface. Entire diameter ’2 mm.; length of spines ’075 mm. 
Lower greensand, Haslemere. 
31. Stellettites ? sp. (Plate 42, figs. 14-14e).—-Zone spicules, in which the shafts 
are greatly reduced, whilst the head-rays are, as a rule, widely extended in a nearly 
horizontal direction and symmetrically bifurcate. The great variety of size of these 
spicules indicates that they may belong to more than a single species. It is possible 
that some may belong to the dermal layer of lithistid sponges. It is a very common 
form, and occurs also in the lower lias of Schafburg (Dunikowski), in the upper chalk 
of Norfolk and Westphalia (Zittel), and in the eocene of Brussels (Rutot). 
L. G. S., Folkestone. U. G. S., Blackdown, near Warminster,.Penzlewood, Merstham. 
32. Stellettites callodiscus, Carter sp. (Plate 43, fig. 3 ; op. cit., p. 123; Plate 9, fig. 
40).— Delicate flattened discs, circular or slightly elliptical in outline, with a well- 
defined smooth margin. Radially disposed at equal intervals near the margins are 
from twelve to fourteen flask-shaped apertures ; between each of these there are two 
and occasionally three smaller sub-oval apertures. A series of canals radiating from 
the common centre of the disc extends to near its periphery. One of these canals is 
present between each of the larger flask-shaped apertures. A fairly large spicule is 
•313 by ‘263 mm. In spicules which are in process of breaking up, the smooth 
margin disappears, the flask-shaped apertures open on the outer border, and the canals 
are greatly widened, so that the spicule has an altogether different appearance. 
U. G. S., Blackdown, Warminster. This form is also present in the upper chalk of 
Norfolk (Hinde) and Westphalia (Zittel). 
33. Tethyopsis Haldonensis, Carter, pars. (Plate 44, figs. 15, 15a ; Plate 43, figs 1-ld; 
op. cit., Plate 10, fig. 70, non fig. 69). —Trifid spicules, with straight, elongate shafts 
and rays, usually inequal in length, and simple, which extend at a wide angle, and 
generally exhibit a slight recurvature. Frequently only two rays are developed. 
Length of shaft (incomplete) 1’9 mm.; thickness ‘075 to - 13 mm. Rays '3 to 
‘62 mm. in length, by •075 to T25 mm. in thickness. 
L. G. S., Haslemere, Folkestone. U. G. S., Blackdown, Llaldon. 
34. Small trifid spicules of different species (Plate 42, figs. I 7-1 7k). —The affinities 
of these small spicules are doubtful; figs. 17, 17 a, b may be either young spicules of 
Geodites, or the dermal spicules of a lithistid sponge ; the clavate spicules, 17c, d, e, 
approximate to the four-rayed spicules of Pachastrella ; the obtuse spicules, 17 g, h, i, 
are now in the condition of glauconite, and, though apparently perfect, may vary con¬ 
siderably from their original forms in silica; and the small spicule with much branched 
rays (1 7k) is very probably the dermal spicule of a lithistid sponge. 
U. G. S., Blackdown, near Warminster, Merstham, Yentnor. 
35. Pachastrella ( Dercitus ) Haldonensis, Carter (Plate 43, figs. 4-4 i; op. cit., p. 130; 
