806 Dr. P.M. Duncan on some Fossil Corals from Sinde. 
cyathus sinuosus and Astrocenia Caillaudi are the most remark- 
able: the first is subject to some variation in its form, like all 
simple Corals, but the specimen from Sinde is, even in its mi- 
neralization, undistinguishable from others found in the Mari- 
time Alps of Europe; and the last is a gigantic specimen, with 
very remarkable, thick mner terminations to its principal septa. 
The specimen of Cyathoserts Valmondoisiaca is very like the 
drawing of the French form by Michelin. 
It must suffice to assert the strong probability of the new 
species being of more than one Tertiary age, until careful col- 
lectors transmit specimens with their localities marked on the 
geological maps. The new Eocene species would appear to be :— 
Phyllocenia conferta, Montlvaltia brevis, Hydnophora rudis, H. 
Dane, H. plana, H. hemispherica, Trochoseris aperta, Cyathoseris 
irregularis, and C. magnifica. The Miocene species are probably 
Dasyphyllia gemmans, Antillia dentata, A. plana, A. ponderosa, 
Mycedium costatum, Agaricia agaricites, and Porites incrustans ; 
and the Oculina Halensis, Cladocora Haimei, Pachyseris rugosa, 
and Corallium pallidum are either of a late Miocene age or of a 
still later geological epoch. 
EXPLANATION OF THE PLATES. 
Puate XVIII. 
Fig. 1. Oculina Halensis: a, terminal portion of a branch, natural size; 
b, side of calice, magnified 6 diameters. 
Fig. 2. Phyllocenia conferta: a, corallum, natural size; 6, calices, magni- 
fied 6 diameters. 
Fig. 3. Dasyphyllia gemmans: a, corallum, one-half the natural size; 
b, part of corallum, natural size, showing the aborted branches 
and the worn costz ; ¢, calice, natural size. 
Fig. 4. Montlivaltia brevis: a, corallum, natural size; 6, side views of — 
portion of the corallum, showing the epitheca and costs, magni- 
fied 2 diameters. 
Fig. 5. Antillia plana: corallum, showing the columella, natural size. 
Fig. 6. Cladocora Haimei: a, portions of a corallum, natural size; 0, ca- 
lice, magnified 6 diameters. 
PLATE XIX, 
Fig. 1. Hydnophora rudis: a, part of calicular surface, natural size ; 
6, monticules, magnified 2 diameters. 
Fig. 2. Hydnophora Dane: side view of corallum, one-third the natural 
size ; a, monticule, magnified 4 diameters. 
Fig. 3. Hydnophora plana: a, part of calicular surface, natural size ; 
b, monticules, magnified 4 diameters. 
Fig. 4. Hydnophora hemispherica: monticules magnified 4 diameters. 
Fig. 5. Trochoseris aperta: a, calicular surface ; b, side view of corallum ; 
both natural size. 
Fig. 6. Cyathoseris irregularis; corallum, natural size. 
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