4 PLIOCENE MOLLUSCA. 



being recorded in the synoptical list of Mollusca given on pj). 203 et seq. of the 

 first Supplement to his Monograph. 



By the work of the brothers Bell and Prof. Kendall at Walton,^ and especially 

 by my own at Little Oakley, our knowledge of the Waltonian fauna has been much 

 enlarged, between six and seven hundred species and well-marked varieties of 

 mollusca being known now from this division of the Crag, obtained, however, 

 during many years' labour, and by the sifting and examination of something like 

 200 tons of material.^ 



As a result of these investigations, it is possible to form a more correct 

 opinion as to the true relation of the Walton bed to the rest of the Crag. Not only 

 has the view held by Wood that it Avas decidedly older than any other part of 

 the Red Crag been confirmed, but it has been shown to be much more nearly allied 

 to the Coralline Crag than has been hitherto suspected. Indeed there is less differ- 

 ence between the fauna of the latter and that of the Red Cras: of Walton than 

 there is between the Walton Crag and the later deposits of Butley or Bawdsey. 



With the exception of a few species, very rare in the Coralline Crag, and of 

 some minute and fragile forms, nearly all the more characteristic ]\Iollusca and most 

 of the Polyzoa of the Coralline Crag have now been found in the Waltonian. A 

 few specimens only of some of the smaller species have been met with at Walton, 

 principally in a bed of stratified silt at the base of the section, apparently deposited 

 under different conditions to the rest of the Red Crag; this bed has been hidden 

 by talus for many years. Such minute forms are not everywhere present even in 

 the Coralline Crag. In the Red Crag they are nowhere plentiful, owing to the 

 littoral and shallow water character of that formation. Speaking generally, a large 

 proportion of the Red Crag shells are worn and rolled, as are many of those found 

 on our beaches at present. 



In a paper recently published/^ Mr. A. Bell has given his reasons for an 

 opinion he has long held that a portion of the Crag of Boyton which contains, with a 

 fauna characteristically Coralline, certain Red Crag species such as Nassa reticosa, 

 almost unknown from the earlier deposit, is of Coralline age ; I adopt this view, 

 and now regard that part of the Boyton Crag as intermediate between those of 

 Gedgrave and Walton. 



It does not seem to me therefore that there is sufficient reason for such a 



^ Prof. Kendall has very kindly placed in my hands the results of his researches for 

 publication. 



2 To prevent disappointment to any persons who might wish to visit this prolific locality, I ought 

 to mention that by arrangement with A. M. Garland, Esq., of Michaelston Hall, near Doveicourt, the 

 owner of the Oakley estate, the excavations made by me from year to year were filled up and levelled 

 down as the work [iroceeded. I can hardly thank Mr. Garland enough for his kindness in allowing 

 me to carry on my investigations on such an extended scale. I i)ropose to oifer my collections from 

 this spot to the Sedgwick Museum at Cambridge. 



3 Journ. Ipswich Field Club, vol. iii, p. 5, 1911. 



