384 
VINE; NOTES ON FOSSIL TOLYZOA. 
probability some functional character may be indicated by them, but 
whatever it may be I am also unable to sug-gest. 
III. Monticules. — The structure of the corallites at this particu- 
lar part of the Corallum is peculiar. The Monticules, as I have already 
explained, is an area more or less elevated above the general surface, 
and at places where this occurs I find a double set of corallites, each 
set of which have different characters. In Fig. 2, 2* I have given 
a drawing of several of the calices of the Monticule ; while 2*^ are 
the calices of the normal Corallum which are somewhat connected 
with the axial region of the Corallum ; but the true structure of the 
walls of all these are laminar, as in 2^ In plate III., fig. 1 of the 
Genus Monticulipora, Nicholson has figured a single corallite x 50 
♦ times, which show at once the general character of the coraUite walls 
which is indicative of successive stages of growth. 
None of the walls of my Yorkshire specimen show the " spini 
form corallite " as shown in Nicholson's fig. (pi. III., fig. 1^), but in 
a section of my Redesdale species I have the same structure as 
figured by the author. In this the Yorkshire differs from the 
Redesdale and Haltwhistle specimens. 
IV. Axial region. — In the axial — that is to say the central part 
of (the Corallum — the tubes lie almost parallel as partly indicate 
(Fig. 2, 2**, lower part) in the sketch. Here the tubes are compressed, 
but the walls of the separate tubes are distinct, and an interval is 
clearly defined between wall and wall. At varying intervals there 
are tabulae, and these are complete. They are not numerous, and 
they do not differ greatly from the tabula shown in Fig. i. e. pi. III. 
of Monticulipora. The axial tubes, however, are far more regular 
than indicated in Nicholson's figure. 
With these special details of the structure of Phillip's Calam- 
opora before us, it will be easy to point out the differences between 
it and the Genus Tahulipora^ founded by Mr. John Young ; though 
I have a specimen of another fossil in my Hurst collection which 
very closely resembles, superficially, T. Urii, Young. It is rare, 
and I do not like to section it without other specimens were at hand 
to replace it. 
In the Scotch Tabulipora Urii, the slightly inner portion of the 
