Tlie Invertebrate Fauna of the Uitenhagc Series. 43 



from these beds is still in course of preparation ; but I am indebted 

 to the Director of the Geological Survey of India for permission to 

 utilise the Indian specimens at present in my keeping for the purpose 

 of this correlation. Several Oomia types at once suggest most 

 strongly their affinity to Uitenhage forms, and these are the 

 following. An Exogyra occurring in Oomia beds at the Trummo 

 Eiver is certainly not distinguishable from individuals of E. imbricata 

 Krauss, and may at any rate be thus provisionally named ; an 

 Astarte found in association with Trigonia ventricosa and other 

 characteristic Oomia forms very closely resembles Astarte Jierzogi 

 Krauss, though it is not identical with it ; there are fragments of a 

 large, coarsely-ribbed Cuciillaa which, so far as can be seen, shares 

 all the distinguishing features of the strongly characterised Gucullcea 

 Jcraussi Tate ; a large Gervillia very closely resembles G. dentata 

 Krauss, and is probably identical with it ; * and lastly, the Oomia 

 beds have yielded specimens referable to the genus Seebachia, other- 

 wise only known by Seebackia bronni (Krauss), from the Uitenhage 

 Series. Two of these individuals from Cutch very closely resemble 

 S. bronni, and it is not improbable that they are identical with it. 



The closely similar character of these lamellibranch-faunas is 

 clearly shown when we place side by side the identical, proximate, 

 and analogous types, as follows : 



Qitenhage Beds. Oomia Beds. 



Exogyra imbricata Exogyra imbricata 



Cucullcsa kraussi Cucidlcsa kraussi 



Gervillia dentata Gervillia dentata ? 



Astarte herzogi Astarte sp., near herzogi 



Trigonia ventricosa Trigonia ventricosa 



Trigonia holubi } 



Trigonia herzogi } (Pseudo-quadrat*) Trigonia mamillata 



Trigonia of the vau Trigonia of the v-scripta 



group group 



Seebachia bronni Seebachia bronni ? 



A more critical and detailed study of the Oomia lamellibranchs 

 may possibly reveal further connecting links, but two inferences may 

 already safely be drawn from the general agreement observed to 

 exist between these geographically widely separated faunas. Firstly, 

 despite the absence of clues to correlation derivable from the Cepha- 

 lopoda, we may conclude that the faunas were approximately con- 



* See also W. T. Blanford (1), p. 118. 



