CORALS FROM THE MOUNTAIN LIMESTONE. 169 
The British specimens of this species that we have seen in the Museum of Bristol and 
of Practical Geology, were all younger than some of our Belgian specimens, and that 
circumstance accounts for their not having so many septa, (twenty-six mstead of thirty-two,) 
their calice was also more or less broken down, the upper tabula appeared also more 
extensive than in the well-preserved adult individuals; but not having discovered any 
important difference between all these fossils we are confident in their specific identity. 
As the position and the form of the septal fossula appear to furnish very good characters 
for the different species of this genus, Z. Phillipsi may at first sight be distinguished from 
all the species in which that fossula’is placed on the ventral or inverted side of the 
corallum, and from those in which the fossula, although placed, as in this, on the dorsal 
side, is quite near to the wall of the calice, and extends but little towards the centre of the 
visceral chamber. The species in which the fossula so far resembles that of 7. Phillips: 
differ from it by the following peculiarities: in Z. cornucopie’ the fossula is long and 
narrow; in Z. Koninchki’ the septa are thicker towards their upper end and have a 
prominent lobe at their inner edge; in Z. Grifithi* there are two small septal fossulee, and 
in Z. Michelini* the general form of the corallum is less elongate and less regular, and the 
septa are stronger and more equal in size. 
3. Zapurentis Grirritui. Tab. XXXIV, figs. 3, 3a. 
ZaPurentis Grirritat, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzeoz., 
p- 333, 1851. 
Corallum short, turbinate, and slightly curved. pitheca thin, and forming small 
circular ridges. Calice circular, not very deep, and having a thin edge. Septal fossula 
large, deep, extending to the centre of the calice, and placed on the dorsal side of the 
corallum, (that is to say, towards the convex curve.) Some appearance of two other small 
septal fossule placed at right angles with the former one. ‘Thirty-six principal septa, 
somewhat unequally developed alternately, not closely set, and uniting two by two at 
their inner edge, where they are slightly bent; those situated near the fossula are some- 
what deviated from the normal radiate direction, and unite at their imer edge so as to 
constitute the lateral margins of the fossula; an equal number of small septa alternating 
with those above described. 'T'abulee well developed. Height of the corallum 12 or 138 
Imes ; diameter of the calice somewhat more. 
The only specimen that we have seen belongs to the collection of Mr. Stokes, and was 
found at Clifton. 
This species differs from all the other known Zaphrentes im having its septal fossula 
centro-dorsal, two small lateral fossula, and a short and broad form. 
1 Caninia cornucopia, Michelin, Icon., tab. lix, fig. 5; Milne Edwards and Jules Haime, Polyp. 
Paleoz., tab. v, fig. 4. 2 Milne Edwards and Jules Haime, op. cit., tab. v, fig. 5. 
5 See tab. xxxiv, fig. 3. * Tbid., op. cit., tab. iii, fig. 8. 
