Vol. 56.] 



MR. P. W. HARMER ON THE CRAG OF ESS} X. 



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common in the northern part of the Crag area ; and the varying 

 proportion between the two at different localities coincides every- 

 where with that between the southern and northern, and the extinct 

 and recent species of mollusca. 



The most important and best-known exposure of Crag in the 



county of Essex is that of the 

 long cliff-section at Walton- 

 on-the-Naze (marked 1 on 

 the map, fig. 1, p. 710) J 

 There is also a large pit 

 near that town at the spot 

 marked 2, which is now 

 overgrown, but it could be 

 easily opened if permission 

 were obtained. 1 



In his First Supplement 

 to the 4 Monograph of the 

 Crag Mollusca' 2 Searles V. 

 Wood gave a list of 148 

 species of mollusca known 

 to him from Walton, a large 

 proportion of them being 

 extinct or southern forms ; 

 and in his Second and Third 

 Supplements 3 about 50 more 

 were added, principally on 

 the authority of the late 

 Robert Bell. Some years 

 later, Mr. P. F. Kendall 

 worked at Walton for a 

 considerable time, increasing 

 the list of shells to about 

 320. 4 His researches, with 

 those of other observers, 

 have, however, confirmed 

 Wood's view of the southern 

 as well as the older character 

 of the Walton fauna. 



Unfortunately, at present 

 and for some years past the 

 cliff-section has been ob- 

 £ scured by talus, and visible 



only at a few isolated spots ; 



1 It would be more useful, and more interesting also, if collectors would 

 devote their efforts to these less-known Crag localities, rather than to the few 

 pits to which continuous attention has been paid during so many years. 



2 Monogr. Pal. Soc. (1872) pp. 203-19. 3 Monogr. Pal. Soc. (1879 & 1882). 

 4 Mr. Kendall has very generously offered to allow me to incorporate this 



list with that of the species obtained by me from Beaumont and Little Oakley, 

 which will very much increase the value of the latter to students of the Crag. 



