88 
Wright — List of Irish Cretaceous Microzoa. 
and Planorbulince with less regular holes. M. Vanden Broeck, of Brussels, 
has lately discovered a Lageniform * porcellanous’ Foraminifer with a regu- 
larly cribrate or latticed shell. Thus in both divisions of the Foraminifera 
we have open-chambered shells, analogous to the basket-like structure of 
the siliceous Polycystina ( Radiolaria ). How far these may be taken as 
indications of another, or other divisions of the Rhizopods, further research 
will show.” 
122. Fragments of tubular branched forms more or less aculeate near to the 
so called Dentalina (?) aculeata of D’Orbigny. My friend Professor T. 
Rupert Jones proposes to distinguish this simple, calcareous, subsegmented, 
branching, Nodosarian form by the “generic” name Ram u LINA (from 
“ ramulus,” a little branch) ; the “species” above mentioned, which is 
common in the French and British chalk standing as Ramulina aculeata 
{D' Orb.), and our Irish form, which differs from D’Orbigny’s in being 
smooth, as Ramulina l^evis, gen. et sp. nov. Jones , see PI. III. fig. 19. 
Rather rare. 
123. Ramulina brachiata, sp. nov. Jones , see PI. III. fig. 20. Very rare. 
Professor T. Rupert Jones says of this form that its nearest known analogue 
in external form among Protozoa is perhaps Dr. Wyville Thomson’s 
Coelosphoera tub if ex, a peculiar Sponge from the North Atlantic. Still the 
fixed position of the tubes and the general aspect of the organism are 
against the probability of these Microzoa being closely allied. 
SPONGE SPICULA.* 
SKELETON-SPICULA. 
124. Acerate spiculum, PI. II. figs. 1 and 2. This form is found abundantly . 
in the Halichondroid sponges both recent and fossil, but it is generally very 
minute. The same form also prevails to a great extent in the skeletons of 
many species of Tethea and Geodia , in both of which these spicula are of 
about the same size and form as those found in the Chalk, and I have no 
doubt that they are from fossil species of one or the other of these genera. 
F requent. 
125. Attenuato-acuate spiculum ; an abnormal form, PI. II. fig. 3. Very rare. 
126. Moniliform attenuato-acuate spiculum, PI. II. fig. 4. Rather frequent. 
* I am indebted to J. S. Bowerbank, LL.D., F.R.S., for the following report on the 
Sponge spicula. 
