neighbourhood of Cirencester. 2G5 



up ; for if we are to found specific names upon typical specimens, 

 the question is, where are we to stop ? certainly in the case before 

 us, not with five species. And again, if we admit the specific 

 identity of the five types under discussion, is it not probable that 

 even these are but derivative forms that may, in like manner, 

 be identified with others ? Our own materials certainly tend to 

 this conclusion. 



In this district the five forms quoted, though not altogether, 

 yet for the most part, affect distinct localities ; hence the T. la- 

 genalis and sublagenalis will be found congregated in masses in 

 the Fairford quarries, while the T. obovata, from being a rare 

 exception with them, becomes the rule between Cirencester and 

 Cricklade. All these, however, are at Malmsbury replaced by 

 the T. digona, which, as yet, is the only instance in this district 

 in which I have observed the latter shell straying from the 

 Bradford Clay, of which I have been used to consider it charac- 

 teristic. 



The only remaining Brachiopod I shall here mention will l»c 

 the T. intermedia, ' Min. Conch.' 1. 15. f. 8 : this is undoubtedly, 

 to say the least, a form of T. perovalis. This opinion again is 

 borne out by Mr. Davidson, as he says in his Memoir, p. 53, 

 " Ter. intermedia bears some resemblance to T. perovalis ; some 

 specimens are undistinguishable." Now as this latter is an 

 abundant fossil of the Inferior Oolite as well as Cornbrash, the 

 sequel will show its recurrence to be of great interest. 



Our next remarks will be upon the Conchifera, the chief in- 

 terest of which will be found in the fact, that in our summary of 

 thirty species, twenty-one or two-thirds can be identified with 

 Inferior Oolite shells, and those for the most part of individuals 

 which have always been held as highly characteristic of the Lower 

 Oolite beds ; this will become apparent from the following 



List of Fossils common to the Inferior Oolite and Cornbrash of 

 Gloucestershire. 



1. Amphidesma securiforrae, Phill. 12. Modiola gibbosa, M. C. 



York. (Gresslya.) 13. plicata, M. C. 



2. decurtatum. Phill. York. 14. Mya hterata, M. C. 



3. recurvum, Phill. York. 15. Ostrea, undetermined (perhaps 



4. Astarte excavata. several species). 



5. Avicula ineequivalvis, M. C. 16. Pholadomya Murehisonar, M.C. 



6. Cardium citronoideum, Phill. t. 545. 



York. 17. gibboaa. 



7. diasimile, M. C. 18. Plagiostoma duplicatum. 



8. , undetermined. 19. Pecten. 



9. Isocardia concentrica. (Ceromya.) 20. Trigonia costata. 



Id iniuima. 21. elavellata. 



11. Lima gibbosa, M. C. 491. 



Here then we have evidence of an older fauna reappearing in 



