90 
Wright— List of Irish Cretaceous Microzoa. 
136. Furcated attenuato-patento-ternate spiculum, PI. II. fig. 18 ; same as the 
last, but probably from a different species of Sponge. Frequent. 
117 Recurvo-temate spiculum, PI. II. fig- >9 5 similar spicula occur in the 
intermarginal cavities of Tdhea and Geodia, and these are probably from 
similar positions in the fossil species of these genera. Very rare. 
138. Spiculum, PI. HI. fig. 1. This form is quite new to me. It is most 
probably from the expansile dermal system of a siliceo-fibrous Sponge. 
Rather rare. 
139. Spiculum, PI. HI. figs. 2 and 3. Singular and probably abnormal form 
of dermal spiculum of a siliceo-fibrous Sponge. Rather rare. 
140 Porrecto-ternate spiculum, PI. II. fig. 20. This form of spiculum occurs 
’in some species of Tdhea ( Tethea cranium , British). An external defen- 
sive spiculum. Frequent. 
141. Porrecto-ternate spiculum, PI. II. fig. 21. Very rare. 
142. Porrecto-ternate spiculum, PI. II. fig. 22 1 same as the last, but probably 
indicating a different species. Rather rare. 
H3- 
Attenuated rectangulate hexradiate spiculum, PI. III. figs. 4 and 5, from 
a siliceo-fibrous Sponge (see “Mon. Brit. Spongiadae,” Vol. I. PI. VII. 
fig. 174). In great profusion. 
SKELETON-FIBRES. 
144. Fragments of skeleton-fibres of a siliceo-fibrous Sponge, PI. III. figs. 
6 and 7. Very rare. 
145. Apparently fragments of skeleton fibre of a siliceo-fibrous Sponge, PI. III. 
figs. 8 and 9. Abundant. 
146. Fragments of skeleton fibre of a siliceo-fibrous Sponge, PI. HI. fig. 10. 
Rare. 
