802 Dr. P. M. Duncan on some Fossil Corals from Sinde. 
and flat. The monticules are very small, and are much less 
than the corallites; they resemble small insects, are compressed 
laterally, very slightly elevated, and are wide apart. The septa 
are numerous, and the longest arise from the middle of the. 
monticule; they are alternately very short and long, and are 
often enlarged at the free extremity, but otherwise are straight 
and thin. Height of corallum 34 inches. Length of monticules 
=!; inch, breadth 1, inch; width of series 25--2; inch. 
Locality, Sinde Tertiaries. Coll. Geol. Soe. 
The minute monticules, their compressed form, and septal 
arrangement distinguish this species. 
15. Hydnophora plana, nu. sp. Pl. XIX. fig. 3. 
Corallum foliaceous ; its upper surface level, and marked by 
numerous conical monticules rather inclined and often im parallel 
series, whilst the lower is indistinctly marked by faint costz. 
The monticules are irregular in size, rarely thin above, often 
compressed in the direction of the series, and varying in height. 
The septa are distinct, and a large one is usually succeeded by 
a smaller. Width of the valleys + inch, depth 4 inch; ten 
large and ten small septa in } inch. 
Locality, Sinde Tertiaries. Coll. Geol. Soc. 
This species is allied to two recent species, but has only a 
generic affinity with the Eocene Hydnophora Bronni and with 
the next form described. The alliance with H. Demidoffi and 
H. exesa is close: they are both from the Indian Ocean. 
16. Hydnophora hemispherica, n. sp. Pl. XIX. fig. 4. 
Corallum irregularly hemispherical, concave below, and very | 
convex above. Monticules very irregular in size and shape: the 
majority very small, and conical ; the rest either larger and conical, 
or large and very long in the direction of the series, and all ap- 
pearing to have been sharp at the summit, and rarely compressed. 
The septa are numerous, delicate, alternately large and small, 
and crowded. Width of valleys .2;--%; inch. Height of monti- 
cules inch. Height of corallum, 1,8, inch. 
Locality, Sinde Tertiaries. Coll. Geol. Soe. 
This species belongs to the same section as the Hocene H. 
Bronni, but is readily distinguished from it: however, this is 
the closest alliance it has. 
17. Solenastrea, sp. 
A rolled specimen of a new species of this genus in the British 
Museum is too much worn for a correct diagnosis to be-made. It 
is easily distinguishable from S, Verhelsti. Locality, Sinde 
Tertiaries, 
7 a 
