336 PROFESSOR P. M. DUNCAN ON THE 
Pourtales, dredged up in 324 fathoms off the Florida reef, is well worthy of study, and 
has formed part of a late memoir by me to the Royal Society’. 
The following species is remarkable, but I cannot place it in any satisfactory 
position :— 
Genus incerte sedis. 
—— ——. (Plate XLVIL. figs. 1-8.) 
The corallum is simple and flat; the calice is very open, shallow, and irregular, and 
unsymmetrical in shape, and its margin is broad. 
‘The coste are large, and irregular in their course and arrangement; they are in some 
places straight and subequal, in others curved and unequal; but all are finely granular 
and rounded. 
There is no epitheca, no dissepimental tissue; but there are synapticule. 
The septa are irregular, rather exsert, in places are thin, alternately large and small, 
and granular; they pass towards different parts of the centre of the calice. The 
columella is rudimentary in one portion of the calicular axis, and exists along what 
appears to be an old line of fracture, which forms a ridge at the base also. There are 
no pali. 
The specimens appear to have been injured during life and repaired. A smaller 
specimen, which appears to have been fractured, has grown at the fractured end and 
developed small septa. 
It is impossible to place these specimens satisfactorily in any genus: they may belong 
to Diaseris; but the resemblance of their bases to those of Hemicyathus crassicostatus, 
Seguenza, Older Pliocene, is most remarkable. The absence of pali, however, prevents 
the inclusion of the forms in that genus. 
Genus Piioporurus, Pourtales. 
PLIOBOTHRUS SYMMETRICUS, Pourtales. (Plate XLIX. fig. 7.) 
A specimen of this form was dredged up in the cold area of the North Atlantic, in 
500 to 600 fathoms. 
I doubt much whether it is one of the Tabulata; but I introduce it here, and refer to 
Count Pourtales’s description in his ‘Deep-Sea Corals,’ No. 4 (Illustr. Cat. Museum 
Harvard Coll. 1871, p. 57)—a most remarkable and interesting work, which, unfor- 
tunately for me, came to hand many months after the completion of this essay. 
» Phil. Trans. Royal Society, 1872. 
