112 



BRITISH CRETACEOUS BRACHIOPODA. 



10. Rhynclwnella latissima, Sow. (abundant). A well-known Upper Green Sand shell, 



plentiful at Warminster and at Chardstock, also in the 

 Tourtia, &c. R. antidichotoma, Buv., of Mr. Sharpe's list, 

 is nothing more than a variety or accident in the plication 

 of Sowerby's shell. 

 11- „ depressa, Sow This species has been likewise obtained from the Upper 



Green Sand near Warminster, Chardstock, the Isle of 



Wight, &c, and varies greatly in shape and number of 



the plaits. 



It may, perhaps, be Rh. triangularis of Wahlenberg, but I feel unable to concur 



in the opinion expressed by Mr. Sharpe that both Wahlenberg's and Sowerby's species 



occur at Farringdon, if they be distinct. 



12. Rhynchunella nuciformis, Sow. (not quite so common as R. depressa), is a well-known 



Upper Green Sand shell, and is found both at Chardstock 

 and in the Isle of Wight, &c. 

 I have not, therefore, been able to recognise positively more than twelve out of Mr. 

 Sharpe's nineteen species, but admit, at the same time, that there did exist among the 

 specimens obtained some few valves which might admit of doubt ; but the material in our 

 possession was not sufficiently perfect to warrant a positive identification. No locality 

 seems (palaeontologically speaking) more anomalous than Farringdon, and from the 

 problematic condition of its sands and gravel, is worthy of still further investigation. 



The only well authenticated British Lower Green Sand species I have been able to 



examine, are : 



1. Linffula truncata, Sowerby (p. 6). 



2. Terebratula oblonga, Sowerby (p. 51). 



3. „ prcelonga, Sowerby (p. 58). 



4. ,, tamarindus, Sowerby (p. 74). 



5. Terebratula celtica, Morris (p. 73). 



6. „ sella, Sowerby (p. 59). 



7. Rhynchonella Gibbsiana, Sowerby (p. 98). 



8. „ parvirostris, Sowerby (p. 97). 



But, besides these eight, imperfect examples of one or two doubtful shells were placed into 

 my hands, which I was unable to identify. 



In the Catalogue of Lower Green Sand fossils, published by Professor Forbes, 1 mention 

 is not made of other species, if we except those quoted from Farringdon, and which have 

 been found in no authenticated Lower Green Sand locality with which I am acquainted. 

 Mr. S. H. Saxby, who has minutely explored the Cretaceous strata of the Isle of Wight, 

 informs me (while placing his whole collection at my disposal for examination) that 

 " Brachiopoda are by no means prominent in Lower Green Sand catalogues ; indeed there 

 are only two species that can be termed common, viz., T. sella and R. parvirostris, and 

 these, especially the former, in such profusion as only Brachiopoda know how to lavish. 

 It is, moreover, not a little remarkable that the Cracker bed, which furnishes the most 



1 'Quarterly Journal of the Geol. Soc.,' vol. i, p. 345, 1845. 



