LOWER AND UPPER GREENSAND OF THE SOUTH OF ENGLAND. 
437 
larger than those of any recent species of Reniera. The form is very common in 
fossil sponge-beds, and cylindrical spicules of different dimensions have been described 
from the carboniferous (Carter); Lias (Dunikowski) ; upper chalk of Norfolk 
(Hinde, Sole as) ; Westphalia (Zittel) ; Bohemia (Pocta). 
4. Reniera Zitteli, Pocta, (Plate 41, figs. 4-4 e ; op. cit., p. 6, taf. I., figs. 10-14). 
Acerate spicules, smooth, fusiform, acutely pointed. Length '3 to '45 mm., width 
•02 to '05 mm. 
L. G. S., Haslemere. U. G. S., Blackdown. 
5. Reniera truncata (Plate 41, figs. 5-5 f ).—Slender acerate fusiform spicules, very 
gradually tapering to the extremities, which are frequently truncate. Canals promi¬ 
nent, enlarging at the spicular ends. Length '33 to 1 mm., by '04 to '058 mm. in 
width. 
With these also may be associated small fusiform spicules in which the canals 
are open throughout their entire length. These forms are regarded by Zittel as 
immature spicules (Plate 41, figs. 5g, 5h). 
U. G. S., Warminster, Merstham. 
6. Axinella gracilis { Plate 41, figs. 7, 7a). —Smooth, slightly curved acuate spicules, 
with rounded but not inflated summits ; tapering from one-third to one-half their length 
to an acutely pointed extremity. Length from '55 to '66 mm., width '033 to '05 mm. 
L. G. S., Haslemere. U. G. S., Blackdown, Haldon, Warminster, Merstham. 
7. Axinella dispersa (Plate 41, figs. 6-6e). —Smooth, straight, or curved acuate 
spicules; summits rounded but not inflated. Some examples taper gradually from tfle 
summit, whilst others are of an uniform width to the centre or even below, and then 
commence to taper. Ends acute or slightly truncate. Length from '51 to 1 mm., by 
'05 to '075 mm. in width. 
L. G. S., Haslemere. U. G. S., Warminster, Blackdown, Merstham. 
8. Axinella stylus (Plate 41, figs. 8-8d). —Relatively large, smooth, straight or 
slightly curved acuate spicules. Summits truncate, rounded, and occasionally with 
a slight inflation. Rarely the spicules taper from the summit, but more generally 
they are of the same width to near the extremity, when they rapidly taper to an 
acute point. Length from l'o to 3'1 mm., width from '085 to 1 mm. 
L. G. S., Haslemere. U. G. S., Blackdown, Haldon, Yentnor. 
9. Spirastrella neocomiensis (Plate 41, rigs. 9, 9a). —-Smooth, fusiform, straight or 
slightly curved spinulate spicules. Length 95 mm., width '05 to '075 mm. 
L. G. S., Haslemere. 
10. Monilites Ilaldonensis, Carter (Plate 41, figs. 11-116; op. cit., p. 132, Plate 9, 
figs. 46, 47). —Cylindrical, slightly curved, moniliform spicules, with from five to eight 
rings. In some examples the inflations become depressed, giving an altogether different 
aspect to the spicule (fig. 116). Length '3 to '53 mm., by '09 mm. in thickness. 
L. G. S., Haslemere. U. G. S., Haldon, Blackdown, Warminster. 
11. Esperites Ilaldonensis Carter (Plate 41, fig. 12; op. cit., p. 131, PI. 9, fig. 43). — 
MDCCCLXXXV. 3 L 
