4 NOETLING : MARINE FOSSILS FROM MIOCENE, UPPER BURMA. 



As regards the first species I have convinced myself by comparison 

 with a specimen from the Indian ocean that the tertiary specimen 

 from Burma must be considered identical with it ; on the other hand, 

 although I have no specimens of the typical Area burnesi) d* Arch., for 

 comparison, I am of the opinion that the specimens from Burma must 

 be identical with that species. Mr. Blanford states that Area burnesi, 

 d'Arch., has probably been found in the Khirthar group. At least I 

 interpret the query in the column of groups corresponding to this 

 species in this way ; we may therefore take it as granted that the 

 exact horizon of Area burnesi is not yet established, and that it may 

 as well be found in the Nari or Gaj group as not. In fact the latter 

 is more probable, but even if further investigations should prove that 

 Area burnesi, d' Arch.-Daphodernia caelata, Reeve, should reach as 

 far down as the Khirthar group, no great value could be attached to 

 this fact because it is still living in the Indian seas. 



There remain therefore only two species which have hitherto 

 been found in the Ranikot group only, viz., Corbula harpa, d'Arch. 

 and Fasciolaria nodosa. Sow. Of these two, Corbula harpa, Sow., 

 from Burma bears a great resemblance to the recent Corbula tunicata 

 from the Indian seas ; the latter only differs by the sculpture of the 

 umbonal part of the left valve which is similar to the sculpture of the 

 right valve, while the whole of the left valve is smooth in the species 

 from Burma. On the other hand I have drawn attention to the fact 

 that the similarity of Corbula harpa, d'Arch., from Sind and of Corbula 

 harpa, from Burma, is not quite absolute ; if d'Archiac's figure 

 represents a correct picture of his specimen, I cannot help thinking 

 that the Indian species has coarser horizontal ribs than the species 

 from Burma, and that perhaps this difference indicates an evolution- 

 ary character. However, even if Corbula harpa, from Burma is 

 fully identical with the Corbula harpa\ d'Archiac, from the JRanikot 

 group, I do not think that this single species, together with Fasciolaria 

 nodosa, could materially affect the views expressed in regard to the 

 Miocene character of this fauna. In fact one ought to be rather 

 surprised that there is not a larger percentage of older forms than 

 two, or at most three species, 

 ( 4 ) 



