20 THE FOSSIL ECHINOIDEA OF WESTERN SIND. 



of the peripetalous fascicle, and the character of the ornamentation of the test. No 

 other form at present known appears to come suiRciently near to require a special com- 

 parison to be made. 



Dimensions. Length of the test 1 inch ; breadth 1 inch ; height over ^ inch. 



Locality. Below Jakhmari Peak, Laki range, west of Amri. Survey-number 



G aso 

 137- 



A large specimen of the same species (larger than the type) from the same locality, 

 but bearing the Survey-number G ff^. 



Illustrations of the Species in Plate IV. 



Fig. 1 . Abactinal aspect of the test : natural size. 



2. Longitudinal profile of the same : natural size. 



3. Transverse profile of the same, showing the posterior extremity : natural 



size. 



4. Outline of the transverse profile of the test : natural size. 

 6. Apical system : magnified. 



6. Apical extremity of the odd anterior ambulacrum: more highly magnified. 



7. Portion of the test, showing the passage of the peripetalous fasciole near 



the extremity of a petal : magnified. 



8. Portion of the test, showing the ornamentation near the lateral fasciole : 



magnified. 



9. One of the large tubercles on the actinal surface : magnified. 



10. Tubercles of the abactinal surface : magnified. 



11. Profile view of the same : magnified. 



V. ^Remarks on the Fawna of Echinoidea of the Beds beneath the Trap. 



The examination of the Echinoidea of the strata below the Trap, which, very 

 probably, is post-Cretaceous in age, and is certainly older than the age of Nummulites, 

 does not indicate any definite horizon. 



The facies of the collection is more Tertiary than Secondary. But this statement 

 must not be made use of in too definite a manner ; for in the Ranikot series of the 

 Nummulitic age above the Trap there are Cretaceous types, which give its fauna, in part, 

 an older appearance than that of the Cardita Beaumonti beds now under consideration. 



There are no characteristic genera in the fauna ; and the new genus has species in 

 the Ranikot group also. 



In fact, the Echinoidea, like the Corals*, do not define the age of this sub-Trap 

 horizon. The fauna is not Cretaceous in the European sense, nor are its genera and 

 species the same as those of the Cretaceous rocks of Southern India or of Bagh in the 

 Narbada area. On the other hand, the facies of the Echinanthus and Idnthia are rather 

 of a Lower-Eocene character ; but there does not appear to be any species common to 

 the Nummulitic series, even of Egypt, and the strata beneath the Trap in Sind. 

 * P. Martin Duncan, "Possil Corals of Sind," PaJseontologia Indica, ser. xiv. (1880). 



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