OP SOPTnEPN INDIA. 
31 
A glance at the preceding list will sIioay the geological distribution of the 
species. Of the 21 species 9 have been identified with those from European creta- 
ceous deposits elsewhere, giving a percentage of 13, this being much larger than that 
recorded in any of the three other classes of Mollusca. In the Cephalopoda the 
jiercentage of European species was about 21, and in the Gastropoda and Pelecy- 
poda between 12 and 15. The larger number in the case of the Brachiopoda is 
perhaps principally due to the better and more detailed knowledge we possess of 
this class. 
As regards the distribution of the species in the different groups of Southern 
India, the table will show, that eight of them are peculiar to the lowest division, 
the Ootatoor group (zone of Am. llotomarjensis and roslro.lus). Of those three 
species arc identical with European ones, T. de2)i'cssa, obesa and capillaia, all occur- 
ring in the Cenomanien, and partly also in the Chalk. 
To the middle, or Trichinopoly, group two species are peculiar; of these Rhyn. 
depressa occurs in Europe in Cenomanien and Turonien beds. 
To the highest, or Arrialoor, group eight species are peculiar, of which again 
three arc Eiu’opcan, Crania lynaberyensis. Ter. Carteri, and Kingena lima ; the first 
and second occur in Turonien and Senonicn beds ; the last makes its appearance ah’cady 
in the Cenomanien, if not in the upper Gault, and continues into the uppermost 
beds of the cretaceous deposits. The lower and middle divisions have no species 
common, hut the middle and upper have three common, and of these T. hiplicata 
and suh-rotimda are two of the most common and most widely spread species in 
European cretaceous rocks. The former certainly begins already in the lower Ceno- 
manien, possibly in the upper Gault, and disai:)pcars in the ripper beds of the 
Senonicn, A\ hilo the latter occurs first sparingly in the upper Cenomanien, and is 
common in Turonien and lorvcr Senonicn beds. 
Thus, the examination of the Brachiopoda, though comparatively ferv in num- 
ber, entirely confirms the results obtained from the other classes of the IMollusca, 
namely, that our lowest, or Ootatoor, bods very closely correspond to the upper Green- 
sand of English-, Cenomanien of Erench-, Tourtia and Lower Plsencr of German- 
Geologists, while the Trichmopoly beds answer closely to the Turonien, and the Arria- 
loor beds to the Senonien. I am com'inced that a still more close parallel of the 
Indian with the European middle and upper cretaceous dmsions might be obtained, 
if the different horizons of the former were better studied on the basis of correctly 
determined fossils. 
