OF SOUTHERN INDIA. 
13 
Tlio Tjiocn:ofiMiLW.£, as defined by Froinontel, form a natural group of simple 
coralla, -with entire edges to the septa. The simple growth with the great develop- 
ment of the septa separates them from tlie Stylixidje and allied families, and the 
presence of dissepiments from the TuitniyoLiDJE and CjsrorjiYi.uihii. 
Species of the family are probably more numerous in the cretaceous than in 
any other formation. Only a comparatively small numhc'r is found recent. In 
Southern India we have four genera represented; Trochosmilia witli four, Loplios- 
milia, Epismilia, and Psammosmilia, each with one species. Of the first-named 
genus two species arc identical with European ones, T. injlexa, Rcuss, from the 
Turon beds of the Gosau (Lower Austria) and of France, and T. tuba, Fr omen tel, 
from the beds of the same age at Sougraigno in France. 
IV. Genus. — TROCIIOSHILIA, IFdne-Edwards and Eaime, 1848. 
Comp. Fromentel, Pal. Fraiu;. terr. cret., tome vlii, p. 253. 
Corallum simple, ohversely conoid, sub-cylindrical or compressed, sub-pedi- 
cellate, or sessile with a broad base ; calyx sometimes round, more commonly 
elliptical, very slightly concave ; septa numerous in six systems, dissepiments abund- 
ant; no columella; wall naked or with a partial rudimentary epitheca; costm 
simple, generally granulated and distinct in the entire length of the corallum. 
This genus includes a large number of fossil species from cretaceous and 
tertiary deposits. Ehur species arc found in the cretaceous beds of South India. 
Dr. Duncan, in bis supplement to the British Fossil Corals (Pakcontograpb. 
Soc., vol. xxii, p. 5,) regards Coelosmilia as a sub-genus of Trochosmilia, the former 
ditfering from the latter only by the very small portion of an endotheca and scarce 
dissepiments. Still it cannot be denied that the Cwlosmilicc form a natimal group, 
and the genus is retained as distinct by most authors who have written on fossil and 
recent Corals. Indeed in general character the Cailosmilice much more resemble 
the TuRBixoLiDM than the Tuochosmilidm. 
1. Trochosmilia ereviclla, Sloliczka. PL I, Fig. 21. 
Troch. corallum hremter cylindraceum, hasi latissima affixtim, theca murali temd 
tectum, costis a, cutis, granulatis, crassiorihns cum tenuiorihus odternantibus ; seclione 
rotunda; spatio columellari centrali, minimo ; septis in quinque cyclis perfeclis 
disposilis, primariis ad terminationes internas pxmlo incrassatis. 
A remarkably short, cylindrical species, sessile by a very broad base; the 
mural theca is thin, and the costae rather sharp, granulated, stronger and thinner 
ones alternating with each other ; in some places three unequal ones, of which the 
median is the thickest, appear to be situated between two somewhat stronger ones. 
The calyx was very shallow, almost flat, with slightly projecting septa near the 
margin; it had to be filed off, in order to show clearly the distribution of the septa. 
D ( 145 ) 
