to Micro-Palceontology. 123 
tubules altogether resemble the normal corallites in structure, 
except that they are provided with much more numerous 
tabulz. Moreover, in old examples the interstitial tubules 
become largely filled up with secondary deposit, so that their 
cavities become largely or wholly obliterated. 
I feel very doubtful as to whether or not I am correct in 
identifying the present species with the Monticulipora Fletcheri 
of Edwards and Haime. After an examination, however, of 
avery large number of specimens I have come to the conclusion 
that these observers probably founded the above-mentioned 
Species upon an example of the form which I have just de- 
scribed, in which the surface was not sufficiently well preserved 
to show more than a few of the larger interstitial tubes. At 
any rate, if this conclusion be incorrect, [ know of no other 
similarly shaped and sized coral in the Wenlock Limestone 
which would show the same circular calices separated by well- 
marked interspaces. 
In various structural features Callopora Fletchert shows a 
reseinblance to C. nana, Nich. ; but it is distinguished by its 
generally much larger dimensions, the circular shape and 
thick walls of the corallites, and the polygonal form and small 
size of the interstitial tubules. Internally the present species 
is at once distinguished by the thickening of the walls of the 
tubes, which in old specimens is sometimes carried so far as 
to almost entirely fill up and obliterate the interstitial tubes. 
Formation and Locality. Not uncommon in the Wenlock 
Limestone of Benthall Edge and Dormington. 
5. Callopora? glans, Nich. (Fig. land Pl. VII. fig. 6.) 
The corallum in this species is of small size, generally 
about four or five lines in greatest height and width, and 
mostly subspherical, hemispherical, or pyriform in shape. 
Sometimes a basal epitheca is developed; but at other times 
the corallum is apparently destitute of this structure, its under 
surface, except the peduncle of attachment, being covered by 
the calices. ‘The surface shows no monticules or macule, 
and is covered witn the large circular openings of the coral- 
lites, with the well-marked apertures of the minute interstitial 
tubes between them. As seen in tangential sections (fig. 1, 
A) the corallites are provided with very thin and delicate walls, 
and have a diameter of about =45 inch. ‘They are approxi- 
mately circular, but their wall is generally bent inwards at 
one or more points into a kind of pseudo-septal fold, giving 
the visceral chamber a heart-shaped form. In other cases 
there axe two of these infoldings of the wall, generally placed 
Qs 
