Stelletta? sp. 
(Plate II fig. 9, 10.) 
Robust spicule with straight gradually tapering shaft and simple 
trifid head; the rays stout, short and recurved. In one example 
the shaft has a contracted neck; in others, the shaft is thickest 
immediately beneath the rays. The incomplete spicule (fig. 9) 
has a length of 4,04 mm; width of head rays 0,63 mm; thickness 
of shaft 0,382 mm. The smaller but complete spicule (fig. 10) 
is 2,76mm long; width of shaft 0,157mm. The interior 
canals are partly preserved. These spicules are extremely rare. 
Spicules similar in shape but much smaller are figured 
by O. Schmidt in Séelletta Grubi (Adriat. Spong. Taf. IV 
fig. 2 a, b) and Dr. Bowerbank represents the ‘zone’ spicule 
of Stelletta (E:cionemia) coactura (Mon. Brit. Spong. Vol. Tl 
p. 269 Pl. 82 fig. 16) with similar short curved head rays. 
This spicule occurs also in the Irish Chalk (Wright.: op. cit. 
Pl. Il figs. 8. 9) and is referred by Bowerbank to Tethea and 
Geodia. 
Stelletta? sp. 
(Plate II figs. 11, 11a.) 
Robust spicule with elongated gradually tapering shaft 
and head of simple conical, pointed, relatively very short rays, 
directed obliquely forwards. Length of specimen figured 
3,98mm., thickness of shaft 0,24mm.; width across the rays 
0,54mm. Rare. 
A spicule of similar form but only half the size is met 
with in Séelletta Boylict’, O. Schmidt (Sp. d. Adriat. Meeres 
p. 47 Taf. IV. fig. 4). The majority of the ‘zone’ spicules 
of Geodia, Stelletta, etc., have the head rays much more 
extended than is the case with this form of spicule. This 
form has also been met with in the North of Ireland (Wright: 
op. cit. Plate II fig. 9.) 
