374 Walter Keeping — Neocomian Sands at Brickhill, Beds. 



Those marked U, are known to occur at Upware, near Cambridge ; 

 F, at Farringdon. 



Terebratula prcelonga (Sow.), U, F. 



,, depressa (Lam.), TJ, F. 



„ Moutoniana (d'Orb.), TJ, F, small and striated variety. 



,, microtrema ("Walker), U. 



,, sella, var. Tornasensis (d'Arch.), TJ, F. 



,, externa (Meyer), TJ. 



„ Seeleyi ("Walker), TJ. 

 Waldheimia Wanklyni (Walker), Tar. elliptiea, TJ. 



,, pseudojurensis ' (Leym.), TJ, F. 

 Terebratella oblonga (Sow.), F. 



Terebratulina striata (Wahl.), var. elongata (Dav.). 2 

 Rhynchonella Cantabridgiensis (Dav.), TJ. 



„ Upwarensis (Dav.), TJ. 



„ antedichotoma (Buv.), TJ, F. 



.„ depressa (Sow.), TJ. F. 



„ latissima (Sow.)., F. 



Ostrea macroptera (Sow.), TJ, F. 

 Lima Farringdonensis (Sharpe), F. 



„ Dupiniana (d' Orb.), (?). 

 Cidaris Farringdonensis (Wright), ? F. 



This list is extremely interesting, as being intermediate between 

 the two remarkable and isolated faunas of Upware and Farringdon f 

 for of the twenty species enumerated, no less than fourteen are 

 common to Upware, twelve occur at Farringdon. and seven are found 

 in all three localities. Terebratula microtrema, T. Seeleyi, Waldheimia 

 Wanklyni, Rhynchonella Cantabridgiensis, and M. Upwarensis were 

 hitherto unknown out of the Upware deposit. 



It may be found necessary to separate the specimens which I have 

 named T. Moutoniana as a variety of that species, differing as it 

 does from the type in being smaller and distinctly striated. 4 We 

 may call it Terebratida Moutoniana, var. Briclchillensis. 



It is conspicuous that the sponges so remarkably developed at 

 Upware and Farringdon are absent from this list ; this is, I think, 

 accounted for by the want of calcium carbonate, such as might have 

 been supplied by the Coral-rag of Farringdon and the Coral-reef of 

 Upware. In the sands of both these localities fragments of the Coral 

 Limestone are abundant ; and I observed, when the fine series from 

 Upware was being collected for the Woodwardian Museum, that 

 nearly all the sponges were found close to the Coral-reef. Lately, 

 since the workings have been removed only 200 or 300 yards 

 further off, where the bed rests on the Kimmeridge-clay, sponges 

 occur but rarely. 5 



The coprolites at Brickhill are of the same type as those of 



1 Mr. Walker informs me tliat this species has lately been also met with at 

 Folkestone. 



2 I am indebted to Mr. Davidson for this identification. He informs me that " the 

 same variety occurs in the Bargate stone (Upper Neocomian) of Guildford and 

 Godalming in Sussex." 



3 I hope to be able to add to this list as the workings go on, the result of which 

 may prove worthy of another communication to this Magazine. 



4 Faint striae have been observed on some of the Upware specimens. See Mr. J. 

 F. Walker's article in Geol. Mag. 1868, Vol. V. p. 403, Plates XVIII. and XIX. 



5 My father has since obtained for the Woodwardian Museum a few sponges from 

 Brickhill. 



