344 Annals of the South African Museum. 



evolute part remains more uniform and is relatively less throughout ; 

 also the tubercles are near the outer margin. 



The ornamentation on the evolute part is somew^hat similar to 

 that of one of the specimens of S. similaris figured by Stoliczka," 

 but the ribs are fewer and stronger. 



THE AFFINITIES, DISTRIBUTION AND AGE OF 

 THE FAUNA. 



The resemblance between the Cretaceous faunas of Pondoland and 

 Southern India, to which attention has been called by previous 

 writers, consists to a larger extent in the occurrence of allied species, 

 and in almost the same assemblage of genera, than in the presence 

 of the same species in both regions. Thus, out of a total of 92 

 species which have now been found in Pondoland only 10 are known 

 to occur in Southern India. The proportion of the species common 

 to both is greater in the Cephalopoda than in other groups. 



The species found in both regions are : — 



Pecten (Neithea) (jninqucco)<tatHs, Sow. 

 Astarte {Eriphyla) lentic.uhirin (Goklf.). 

 Margarita radiatula (Forb.). 

 Turritella (Zaria) Bond, Baily. 

 Hauericeras Gardeni (Baily). 

 ,, Remhda (Forb.). 



Pseudophyllites Indra (Forb.). 

 Gaudryceras Kayei (Forb.). 

 Hamites (Anisoceraa) subcampressus, Forb. 

 ,, ( ,, ) indie us, Forb. 



It will be noticed that all of these, with the exception of the last 

 two, are widely distributed forms. In addition to these, Griesbach 

 identified 10 other species of Gasteropods with forms found in 

 Southern India ; but after examining Griesbach' s specimens I am 

 unable, as will be seen from the preceding account, to accept those 

 identifications. 



In addition to the species mentioned above as common to Pondo- 

 land and Southern India there are 11 species of Mollusca represented 

 by allied forms. 



If the Ammonites be taken as the sole guide in correlation, then it 

 is clear that the Cretaceous deposit of Pondoland is represented by 

 the Ariyalur Beds of Trichinopoli, and the Valudayur and Trigonoarca 

 Beds of Pondicherri, because all the species which are common to 



* Cret. Fauna S. India, vol. i. (18G6), p. 107, pi. Ixxxi., tig. 6. Eec. Geol. 

 Survey India, vol. i. (1868), p. 30. 



