132 GUIDE TO THE FOSSIL INVERTEBRATE ANIMALS. 



Gallery four-ribbed Neithca quadricostata, and Syncyclonewia [Pecten] 

 VIII. orUmlaris. Among the Grey Chalk fossils from Folkestone, 

 Rostcllaria Fried and Aioorrhais Mantelli are remarkable. 



Fig, 70. — A Lamellibranch shell, Spondyltts spinosics, common ;in the 

 Senonian Chalk of England. Natural size. 



Table-case A beautiful series of silicified shells from Blackdown and 

 Haldon in Devonshire, a set from the Eed Chalk of 



Fig. 71. — Cretaceous Lamellibranchs. a, Neithea quinquecostata, common 

 in Senonian Chalk ; b, Actinoceramus sulcatus, from the Gault. 

 Natural size. 



Hunstanton in Norfolk, and another from the Cambridge 

 Greensand, are all of Albian age. Of the same age are the 



