212 



(c)3. Trigonia clavellatta, Park. b, Astarte politula, Bean, MS. 



c. " varietymuclilessproduced I. Unicardium depressum, Phil. 



posteriorly, and with the b. " sulcatum, Bean, MS. 



tubercles crowded on the c. Isocardia tumida, Phil. 

 anterior margin. b. " minima ? Soiv. 



Ostrea undosa, Bean, MS. b. « nitida, Phil, 



Ostrea archetypa, Phil. » ? clarissima. Bean, MS. 



c. " Marshii, Soiv. c. Anatiua undulata, Soiu. 



b. Cardium cognatiom, Phil. « versicostata, Buvig. 



b, " citrinoideum, Phil. b. Pholadomya acuticosta, Soiu. 



II subdissimile (?) of Orb. b. " ovalis, Smv. 



a. II Crawfordii, (ns.) » carinata ? Goldf. 



Lucina lirata, Phil. b. Myacites calceiformis, Phil. 



h. II crassa, Sow. b. " decussatus, Phil, 



Corhis ovalis, Phil. b. » secuiit'ormis, Phil. 



II Isevis, Sow. a. n recru-vus, Phil. 



b. Astarte lurida, Sma. c. Goniomya, v. scripta, Sow. 



b. II minima, Phil. c, Gresslya peregriiia, Phil. 



Crustacea, Annelida, &c. 



c. Glyphsea rostrata, Phil. Cidaris, imperfect fragments, 



c. Serptda intestinalis, P/w?. Enciinilal siems. 



Note. — The species marked a, in tbe above list, occur also in the bed above, 

 or the Oxford clay; the letter 6 indicates thitl the species is found in the bed 

 below, or the Cornbrashj c, that it is common to all the thi'ce deposits. 



The Zone of Ammonites Jason. — Dark-colom-ecl slaty sliales 

 of the Oxford Claj, in paits Tinctuous and bi'Luminous, and 

 emitting a gas wliich burns with, brilliancy wLeu liglited. It 

 contains many Belemnites and compressed Ammonites, with 

 their white calcareous shell well preserved ; here, likewise, was 

 found AcantJioteuihis aniiqvAis, Sepia, and Loligo, with ink-bags 

 attached. This is the division of the Oxford Clay which was 

 so long successfully worked by the late Mr. William But, at 

 Christian Malford, and from whence all the fine specimens 

 that he distributed throughout the country were obtained. 



(c) 3 Trigonia clavellata should not be inserted, as I have lately added three 

 new species of clavellated Tiigonia, iucludini^' the form thus noted, whicb wiU 

 be described and figured by Dr. Ltcett in his forthcoming work on tbe genua 

 Trigonia. One of these is from a seam only quite lately explored and which has 

 yielded Tancredia curtansaia, Mya modria, (dwarfs,) Gervillia acuta, not hitherto 

 found in the Kelloway rock. Note by J. Leckenbt, Esq. 



