Seeley— Section of the Lower Chalk near Ely. 153 
Chalk is probably to a great extent due to the interstitial atoms 
having been dissolved and removed by the solvent action of 
water passing through its mass. 
If it be granted that this Chalk has been formed in a compara- 
tively shallow sea, it must be a matter of some interest to com- 
pare its fauna with that of Chalk in other localities, presumed to 
have had deeper water. 
Subjoined is such a list, from materials 
in the Woodwardian Museum :— 
Ventriculites radiatus; Swaffham. |} P. Beaveri ; 
V. quincuncialis (?); Cherry-Hin- 
ton. 
Cephalites; Swaffham. 
Micrabacia coronula; Burwell. 
Pentacrinus Fittoni; Burwell. 
Cidaris Bowerbankii; Cherry- 
Hinton. 
C. sulcata; Cherry- Hinton. 
Discoidea cylindrica; Cherry- 
Hinton, Hunstanton. 
D. subuculus; Hunstanton. 
Hemiaster; Burwell. 
Holaster subglobosus ; 
Hinton. 
H. Trecensis; Cherry-Hinton. 
Serpula rustica; Burwell. 
Enoploclytia Imagei; Burwell, 
Cherry-Hinton. 
E. brevimana; Isleham, Burwell. 
Glypheza cretacea ; Cherry-Hin- 
ton. 
Two unnamed Brachyura; Bur- 
well, Cherry-Hinton. 
Rhynchonella Mantelliana; Cher- 
ry-Hinton, Burwell. 
Terebratulina striata; 
Cherry-Hinton. 
Terebratula squamosa; Burwell, 
Tsleham. 
T. biplicata; © Cherry-Hinton, 
Burwell, Hunstanton. 
Ostrea curvirostris; Burwell. 
O. frons; Burwell. 
Pecten orbicularis; Burwell. 
P. Marrotianus (?) ;* Burwell. 
Cherry- 
Reach, 
Burwell, Cherry- 
Hinton. 
Lima globosa; Burwell, Cherry- 
Hinton. 
L. parallela ; Burwell. 
L. aspera; Burwell. 
Plicatula inflata; Burwell. 
Avicula grypheoides; Burwell, 
Reach, Fen-Ditton. 
Perna Crispii, var.; Ely. 
Pholadomya decussata; Burwell. 
Teredo amphisbena; Burwell. 
Cerithium ornatissimum; Bur- 
well. 
C. Gallicum, var.; Burwell. 
Sealaria striato-costata; Bur- 
well. 
Scaphites equalis; Burwell. 
Turrilites Scheuchzerianus; Bur- 
well, Cherry-Hinton. 
T. tuberculatus; Reach. 
Ammonites Sussexiensis; Reach. 
A. Rothomagensis; Reach, Isle- 
ham. 
A. varians; Reach. 
A. Ieenicus; Burwell. 
A. planulatus; Burwell. 
A. Mantelli; Reach. 
A. navicularis; Burwell. 
Nautilus elegans; Isleham. 
Belemnitella plena; Burwell. 
Ichthyosaurus campylodon; Bur- 
well. 
Rhaphiosaurus ; Cherry- Hinton. 
Pterodactylus ; Cherry-Hinton. 
Besides these, there are a few new species, especially some 
Gasteropods. 
Perhaps the most striking feature in the list is 
the number of Encephala and Crustacea; and I notice nothing 
that would suggest conclusions as to the depth they lived in, 
