OF SOrTIIEllN INDIA. 
57 
IVo see from tFis table that, although the majority of the families of the 
Eehinoidea are represented by one or a fcAv species only, the genera are such as are 
mostly characteristic of the cretaceous formation. The total number of all knomr 
Echinodermata is 42, somewhat larger than that of the Brachiopoda and Ciliopoda, 
but much less than that of the throe other classes of the Mollusca. For the reason 
already stated, five of the species must bo omitted from the list upon which any 
geological conclusions can be based. The remaining thirty-six are seen to be 
exclusively* restricted to the lowest and the uppermost of the three groups distin- 
guished, the Ootatoor and Amaloor groups, namely, ten species occiu’ring in the 
former and twenty-six in the latter group. 
Out of the ten species from the Ootatoor group four appear to be identical with 
European species from Cenomanien beds, but only one of the identifications has 
been considered as certain, namely, that of Ciclaris hirudo, while the materials for 
the recognition of Cklaris vesicidosa, snb-vesiculosa and Faring donensis arc not 
sufficient. There can be, however, little doubt that not only these, but also the 
other species, considered as new, exhibit a markedly close affinity to Upper Green- 
sand forms, and that, therefore, the Cenomanien age of the Ootatoor group is con- 
firmed by tbe examination of the few Echinoderms known from it. 
The twenty species from the Arrialoor group arc, with three or possibly four 
exceptions, peculiar to that group in India. The exceptions refer to Fehino- 
conus conicus ( — Galerites alhogalerus) , Cidaris soeptrfera, Marsiipites Milleri and 
possibly M. ornatiis ; all these occur in the Upper Chalk or Senonicn beds, thus 
adding to the former proofs regarding the age of this group, which corresponds to 
d’Orbigny’s Senonicn and Danicn. Taking now the entire number of Ecbinodcr- 
mata from South India, I consider EcMnoconus conicus, Cidaris hirudo, vesicidosa, 
and sceptrifera, and Marsupites Milleri, as sufficiently certainly identical with the 
same species in Europe, and this would give twelve per cent, which the South Indian 
upper cretaceous deposits have in common with those of Europe. 
* Hemiaster tuherosus is the only species which occurs in the Arrialoor and possibly in the Triohinopoly group, 
but the latter is far from certain. 
( 127 ) 
