OF WESTERN SIND. . 97 



situated on mamelons, and the fact that the madreporic body passes backwards and 

 separates the ocular plates, make the form to look much more modern than the Num- 

 mulitic. 



There are two species of the genus Linthia in the Eanikot series. One is allied to 

 Linthia Arizensis, d'Archiac, sp., which is found in the Nummulitic of Egypt and 

 Europe ; but it is well separated from the Linthia found in the strata beneath the Trap, 

 in the Cardita-Beaumonti beds. The other Linthia is a large form not specifically 

 distinguishable, on account of the weathering of the specimen. Its nearest ally appears 

 to be Linthia Lelanouei, de Loriol, from Egypt. 



A Schizaster is found in the Eanikot series, the description and identification of 

 which have given much trouble. The specimen is solitary and is crushed ; but some 

 parts of the structure remain in great perfection. As it is a very striking form, we 

 have described it, more for the sake of field-geologists who may take up the study of 

 the Ranikot series in detail, than for the sake of the advanced palaeontologist. One 

 of our diflBlculties was produced by the wretched condition of the type of Schizaster 

 NeiUholdi, D'Archiac and Haime. It is really a worthless species. The form under 

 consideration has some resemblance to Schizaster Africanus, de Loriol, from Egypt. 



Finally, there is an ill-preserved specimen of the genus Metalia. It may be the 

 Brissopsis Sowerhyi, d'Archiac and Haime. 



There is no doubt that this fauna of Echinoidea is a remarkably isolated one. 

 It has no form that can be satisfactorily and decidedly stated to be identical with any 

 European or American species. The alliance with the Egyptian Nummulitic Echinoid 

 fauna is of the slightest description. There are no species common to this fauna and 

 that of the strata on the same area beneath the Trap which covers the Cardita- 

 Beaumonti beds, and there are no species common to the Eanikot series and the 

 Upper Cretaceous beds of Southern India. 



Making due allowance for errors in collecting specimens, the community of 

 species between the Eanikot and overlying Khirthar series is very small, and no form 

 passes up to the Nari group. 



The grouping of the genera of Echinoidea of the Eanikot series is interesting, and 

 it becomes all the more important in the attempt to define the geological horizon of 

 this great vertical mass of Nummulite-bearing beds, which, however, are clearly beneath 

 the main Nummulitic limestone of the superincumbent and unconformable Khirthar 

 series. In the Eanikot fauna there are 41 species and a variety ; and in the whole of 

 the Echinoidean fauna from the Nummulitic strata of Egypt de Loriol notices 42 

 species. In this corresponding number of species none are identical, and the affinities 

 (of two) are very slight. The generic assemblage of the Eanikot series differs, moreover, 

 from the Egyptian. It contains a greater number of regular Echini ; and only the 

 following genera are common to both areas — Porocidaris, Conoclypeus, Bhynchopygus, 

 Eemiaster, Linthia, and Schizaster. The great mass of the characteristic genera of the 

 Eanikot series are not found in the Egyptian area ; and, vice versa, the important genera 



