Q allery 
VIII. 
Table-ease 
7. 
13‘2 GUIDE TO THE FOSSIL INVERTEBRATE ANIMALS.. 
four-ribbed Ndlhca quadricostata, and Sijmydunertia \Pectai\ 
orhicularis. Among the Grey Cbalk fossils from Folkesloiie, 
liOstcUana Pncn and Aim'rhais Manidli are remarkable. 
Fig. 70. — A Lamollibranch shell, Spo7idi/bis sj>inos7ts, common in the 
Senonian Chalk of England. Natural size. 
A beauliful series of silicified shells from lllackdovn and 
Haldon in Devonshire, a set from the lied Chalk of 
Fig. 71. — Cretaceous Lamellihranchs. a, Ncithea quinquecostata, common 
in Senonian Chalk ; 6, 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 tlie 
shells from the Gault clay of Folkestone, of F>lack Ven, 
