Notices respecting New Books. 135 



are buried beneath beds of blue clay, earth and sand, from 

 80 to 100 feet m thickness. Some of the indurated and flat^ 

 tened stones belonging to or immediately in contact with this 

 stratum, contain well-preserved specimens of Astarte, Pccten, 

 Cardium, Terebratula plicata, large Serpula, Trochus, Nucula? 

 and a small pyritous ammonite with foliated septa. 



In the clay substratum are boulders of strong dark blue 

 clav, in which the fossils assimilate to those of the clay in the 

 envii'ons of London. Sharks' teeth, Teilina, Cardia, and Am- 

 monites conmiunis, have been figured in Smith's " Strata 

 identified by organized Fossils," collected from the indurated 

 clay nodules of Happisburgh cliff! From clay boulders at 

 Overstrand cliff" I have obtained Gryphaea with unusually thick 

 and gibbous valves. A species of Ostrea or Gryphjea is also 

 found here remarkable for having its valves chalcedonized, 

 and the internal cavity filled with dark-coloured silex. These 

 shells are perfectly white, very thick and tumid, and from four 

 to five inches long. Although I have seen many specimens, all 

 have been considerably rounded by attrition upon the beach, 

 and I do not know of any that have been discovered in situ 

 and uninjured. 



As these memoranda are the result of a single examination 

 of a portion of our strata which is little known, they will, I 

 trust, be received as such. Subsequent inquiry will doubtless 

 add much to the geologic information here collected, and will 

 probably occasion another communication, in some future 

 Number of the Philosophical Magazine, from 



Norwich, Aug. 14, 1822. RiCHARD Taylor. 



XXIII. Notices respecting New Books. 



Jtart I. of The Philosophical Transactions of the Royal So- 

 ciety of London, for 1822, has just appeared: the following are 

 its contents : 



I. The Bakerian Lecture. An Account of Experiments to 

 determine tlie Amount of the Dip of the Magnetic Needle in 

 London, in August 1821 ; with Remarks on the Instruments 

 which are usually employed in such Determinations. By 

 Captain Edward Sabine of the Royal Regiment of Artillery, 

 F.R.S. — II. Some Positions respecting the Influence of the 

 Voltaic Battery in obviating the Effects of the Division of the 

 Eighth Pair of Nerves. Drawn up by A. P. Wilson Philip, 

 M.D. F. U.S. Edin. C'-onununicated by B. C. lirodie, Esq. 

 F.R.S. — III. ()ji some alviuc Concretions found in the Colon 

 of a young Man ui Lancashire, ul'tcr Death, liy J. G. Chil- 



th-pu. 



