664 
DE. CAEPEXTEE’S EESEAECHES OX THE FOEAHIXTFEEA, 
223. With reference to the relationship between Tinoporus and the fossil genus 
Orbitoides, to which allusion has already been made, I shall here content myself with 
stating briefly that if the chambers of the equatorial plane of T. loevis were distinctly 
diflerentiated from those of the layers springing from it on either side, it would come 
to resemble in general conformation the simpler t}'pe of Orhitoides kno-rni as the 
0. Mantelli ; and further that if, with this modification, there were also introduced 
the solid pillar-system of T. haculatus, we should have a corresponding resemblance to 
0. dispansus*. The metamorphic condition of the shell of the fossil Orhitoides has 
hitherto prevented me from determining with certainty whether its elementary structiu-e 
bears most resemblance to the inferior type presented by Tinoporus, or to the more 
elaborate structure of that of Cycloclypeus, to which type also it seems to be relatedf. 
On these points, however, I shall enlarge more fully elsewhere. 
Genus Caepenteeia. 
224. Of all the Foraminifera collected by Mr. Cumixg in the Eastern Seas, the last 
which I have to describe is perhaps the most interesting ; since the G-pe of stincture 
which it presents is not only altogether new, but seem to furnish the connecting link 
(which had been previously rather suggested than supplied by ThalassicoUa and its 
allies) between Sponges and Foeaminifeea, — two groups which accord most remarkably 
in their grade of organization, whilst they differ no less remarkably in plan of structure. 
226. The larger number of the specimens of this type in the collection of Mr. Cuming 
are attached to the surface of a piece of Porites (coral) ; other specimens, however, are 
adherent to the shells of Pecten and Cardita ; and the attention of Mr. M*. K. Paekee 
having been directed to these curious* organisms, he has met with them on the surface 
of other bivalves, especially Chania gigas. It is not a little remarkable that the strong 
external resemblance which they present to the shells of certain sessile Cirripedes should 
have led not only Mr. Cuming, but other experienced conchologists, to regard them as 
belonging to that group. Their true nature was first suspected by Dr. J. E. Geay. who 
was led by his study of them to consider them as the testaceous envelopes of a Ixhizopod 
intermediate between Sponges and Foraminifera ; the grounds on which he came to this 
conclusion being, that he found the shell to be multilocular and minutely foraminated 
* I should take this opportunity of stating that in my former description of Orhitoides (Jomm.ol of the 
Geological Society, Feb. 1850) I fell into the same mistake in regard to these pillars, that I did in regard 
to tlie analogous structure in Xummulites ; regarding them as having been passages filled with solid calca- 
reous matter in the process of fossUization, — an error which was pointed out to me by Professor 
W 11 .LIAMSON at the time, and of which I ha^'e since come to be fully satisfied by the examination of the 
recent analogues. 
t The figure given by Professor EnBEWBEKO, in his remarkable memoir .oli'eady referred to, “ liber den 
Griinsand und seine Erliiuterung des organischen Lebens,” plate iv. fig. S, and by him designated as the 
internal cast of Orhitoides javanicus, will be seen on compai'isou to present a most remarkable correspondence 
with figs. 10, 11, 12 of Plate XXIX. (Phil. Trans. 1856) illustrating my description of Cycloclypeus. 
