Norivich Geological Society. 91 



ment of Mr. John Evans and Mr. Flower, that the whole district 

 abounds with fragments of flint implements, which shows that the 

 country was occupied at the time when crannoges were constructed. 

 The President then read the following paper: — ^"On the Discovery 

 of new Beds of Crag." Much credit was gained by the Norwich 

 Geological Society through the labours of Mr. Taylor in ascertaining 

 the distinction between the fluvio-marine, and the upper marine 

 portion of the Norwich Crag. The position of these crags is 

 beneath the Chillesford clay, which appears above them in the 

 Bramerton section. Since that discovery, the Tellina Balthica Crag 

 has been observed at Belaugh, Coltishall, Wrosham, Horstead, 

 Sherringham, and Weybourne, above the Chillesford Clay, of a 

 more Arctic character, and approaching nearer to the Glacial period, 

 which is evidenced by the Lower Boulder-clay or Till. As this 

 crag will be descrided by Mr. Harmer, Mr. Gunn said he would 

 leave it in his hands, and proceed to mention another bed of crag at 

 Sherringham, which occurs far above the Tellina Balthica bed — it 

 rests on the Upper Boulder-clay. The deposit is 15 feet in thick- 

 ness, and is composed of sand with shells, which are so abundant as 

 to justify the term " Crag" being applied to it. Most of the shells 

 are in a very fragmentary state, so much so, that only one species 

 could be determined — it is, according to Mr. Searles Wood, a 

 thickened form of Tellina Balthica. — Norioich Mercury, Jan. 16, 1869. 



coi2,E,:Es:poisrr)En5ro:E, 



THE PLEISTOCENE FRESH-WATER DEPOSIT AT HACKNEY 



DOWNS. 

 Sir, — I must again trespass on your valuable space for a few final lines with 

 reference to the above subject. Since my letter appeared in your journal I have 

 seen Mr. Grugeon, and understand that some shells which he gave me early in the 

 year 1866 were collected by Mr. Skertchly ; I was not aware of this before. The 

 facts of the case are as follows. I called at Mr. Grugeon's house ; a few of 

 the Hackney Down shells were lying there ; he told me I could have them, and 

 then gave me to understand that they were collected by his son, but he now tells 

 me they came from Mr. Skertchly. They were of the commoner species, unsorted 

 and vmnamed, and it is upon this only that the charge contained in GEOLOGICAL 

 Magazine, No. 50, is brought against me, and which in effect is, that Mr. 



Skertchly sent me "a set" of the Hackney Down shells, and that I afterwards 

 published a list of them as my own. I leave your readers to judge how far such 

 an accusation was justified by the facts of the case, and will only add, in conclusion, 

 that the species enumerated in the Geological Repertory were my own collecting, 

 the result of many visits to the spot, and of much time spent at home in examining 

 the sand, etc., with a magnifyer, for the rarer and more minute species. 



Islington, 1868. George J. Smith. 



COEBICULA {CYRENA) FLUMINALIS IN CAPE COLONY. 



Sir, — This species, which is extinct — though very abundant in a 

 fossil state in various parts of Europe — I found living in the 

 Vaal river, in South Africa, in July last. I found it rather 

 abundant about three miles from the junction of the Vaal and 

 Great Orange rivers, about 29° south latitude. I procured 

 about twenty specimens. The river here is rather rapid, though 



