^70 G. W. Butler — A Chalk Fauna near Reigate. 



except in the case of Cephalopod septa, seems always to break so 

 as to show the outside only of these casts, which, if not smudged, 

 are all right for species easily identified by the external form and 

 markings, but are not so good for the small Lamellibranchs. 



Some of the best and most interesting specimens were foimd by 

 my son, while the most interesting of all, the Lingida, was found 

 by Miss E. C. Herdman, of Newnham College, Cambridge. 



This little Lingula is but 'IS in., or 3| mm. in length, but by 

 comparison of the pointed end (X 45) with that of the living 

 L. anatina, it can, I think, be identified as a dorsal valve. Of course, 

 we know that Lingula was living, somewhere, in Chalk times, but 

 its remains seem usually to be found in deposits rich in terrigenous 

 material, such as clays or sands, and so far as I can learn there are 

 only two previous records of Lingula from the Chalk of the British 

 Isles, (1) from the very bottom of the Lower Chalk, within 3 feet 

 of the Upper Greensand, from the " Chloritic Marl " at Eye Hill 

 Farm, 3 miles east of Maiden Bradley,' and (2) the beautiful small 

 specimen in the Jermyn Street Museum, presented by Clement 

 Reid, from the topmost {Ostrea lunata) zone of the Upper Chalk 

 of Britain, from Trimingham.- 



So anyone finding Lingula, however small, in the Chalk should 

 carefully preserve and record it. We may thus perhaps learn 

 something at once about lAngula and about the Chalk. 



The salient feature of the collection made at this spot is the large 

 number of BacuUtes haculoicles. Some pieces of Chalk Marl, weighing 

 as cleaned up only 2 oz., contain nine separate Baculite fragments ! 

 Some specimens of the later formed, obliquely ribbed, portion of the 

 shell, show the slight curve that occurs near the aperture of the full 

 grown shell ; and other specimens of the earlier, smooth portion 

 break across at the position of the septa. 



MantelP says that this Baculite occurs in the South Downs 

 "in every marl pit of the S.E. part of Sussex". In the North 

 DoAvns it is recorded '' from this zone in the Medway cut ; but 

 otherwise I know of no previous record of it from this zone in the 

 North Downs of Kent or Surrey, and making a special search myself 

 from Betchworth to Reigate inclusive, the only place where I found 

 BacuUtes in the A. varians zone is the small lower pit of the " Buck- 

 land Limeworks", and there comparatively few and poor specimens. 

 I have, however, found BacuUtes haculoicles in the " Melbourn 

 Rock " both at Betchworth Pit and also at one of the small pits 

 north-east of the exposure here described. 



I failed to fix the onus of naming my " casts " on someone else, 

 so the blame for the list must rest on me ; but I should thank 



1 Jukes-Browne and Scanes, Quart. Journ. Geol. Soc. vol. Ivii, 1901, p. 117. 



2 Mom. Geol. Surv., Cretaceous, vol. iii, 1904, p. 482. [A small specimen 

 from the H. suljglobosus zone of Cherry Hinton has been found recently and 

 is now in the Sedgwick Museum, Cambridge.- — Ed. Geol. Mag.] 



3 Fossils of the South Downs . . . 1822, p. 123. 

 * Mem. Geol. Surv., Cretaceous, vol. ii, p. 50. 



