374 Mr. Rose's Sketch of the Geology of West N 01 folk. 



these Echinites and Testacea, which are distributed through 

 all the beds of the chalk, a very large proportion are the ex- 

 uviae of young animals : full-grown animals are, in the lower 

 beds, comparatively rare; I may particularize the Gryphcea 

 globosa, Ostrea canaliculata, also the oyster so commonly at- 

 tached to Echini, and Ananchyies hemisphcericus : thus in the 

 adult shells of the upper beds we possess " natural chrono- 

 meters," affording a measure of the period during which the 

 chalk deposition was in progress. 



Name. Reference. Locality. 



Agamia. 

 Confervites* undetermined. Swaffham. 



Polypi. 



Flustra utricularis , 



retiformis 



Lunulites urceolatus ., 

 Millepora truncataf ., 

 polymorpha . 



globularis 



Caryophyllia centralis... 



Madrepora 



Spongia bifida 



X 



Townsendi... 



Polypothecia palmata.. 

 clavellata 



Paramoudra 



Choanites subrotundus 



Ventriculites radiatus§ 

 Benettiae ? 



Geol. Norf., t. iv. f. 7. 



Ibid. t. iv. f. 6. 



Ibid. t. iv. f. 9. 



Ibid. t.iv. f. 13. 



Ibid. t.iv. f. 13. 



Geol. York., p. 1. f. 12. 



Geol.Suss.,t.l6.f.2.4. 



undetermined. 



MS. catalogue. 



Radiaria. 

 Asterias semilunatus . 

 Apiocrinites ellipticusj 



Cidaris cretosa 



Echinus saxatilis 



Konigi 



Spine3, acicularH 



Galerites albogalerus 

 Ananchytes scutatus 



hemisphaericus** 



Spatangus cordiformis. . 



rostratus 



excentricusft*" 



Geol. Suss., t. 15. f. 9. 

 MissBenett'sCaM.ll.f.1 



Ibid. 1. 12. 

 Geol.Trans.,vol.iv. t.24. 

 Geol. Suss., 1. 15. f. 2. 



Ibid. t.lO.f.13. 



Ibid. t.l5.f.3. 



detached ossicular. 

 Miller, Hist. Crin., p. 34. 

 / Park. Org. Rem., \ 

 \ vol.iii. pi. 4. f. 3. J 



Ibid. pl.3. f.l. 



Ibid. pi. l.f. 10. 

 cucumerine & clavated. 

 Geol. Suss., t. 17. f. 8. 

 Org.Rem.,vol iii.pl.2.f.4. 

 Smith's ChalkPlate,f.lO. 

 Geol. Norf., t. 5. f. 6. 

 Geol.Suss.,t.l7.f.l0,17. 

 Geol. Norf., t. l.f. 5. 



Ditto, Litcham, &c. 



Ditto. 



Ditto, ditto. 

 Litcham. 



Ditto. 



Ditto. 

 Swaffham, Litcham, &c. 



Ditto. 



Ditto. 



Ditto, Litcham. 



Ditto. 



Ditto. 

 Saham. 

 Swaffham, Thornham. 



Ditto. 

 f Do. Saham, Thetford, 

 1 Litcham. 

 Swaffham. 



Ditto, 

 Saham, 



Litcham. 

 Ditto. 



Swaffham, Litcham. 



Litcham. 

 Thetford. 

 Swaffham, Litcham. 



Ditto, ditto. 



Ditto, ditto. 



Ditto, ditto. [&c. 

 Do., Thetford, Saham, 

 1 Do., Litcham. 

 I Ditto. 



* On the chalk and flints. 



t Two or three species or varieties, undetermined. 



X Tubular, allied to Siphonia. 



§ Vide my paper in Magazine of Natural History, vol. ii. p. 332. 



|| Bottle Encrinite; Park. Orcyt. pi. 9. f. 13. 



i Measuring 4£ inches long. ** Young of. -\f Unique. 



