A MONOGRAPH -' 



FORAMINIFERA OF THE CEAG. 



INTRODUCTION. 



In May, 1835, Mr. Edward Charlesworth read before the Geological Society of 

 London a paper " On the Crag of part of Essex and Suffolk" (' Proceed. Geol. Soc.,' vol. ii, 

 pp. 195-6), in which he mentioned that, " for his general information respecting the 

 organic remains in the two beds" of the Crag, he was indebted to Mr. Searles Wood (then 

 of Hasketon, near Woodbridge), whose collection of Crag fossils included " 50 species of 

 minute Cephalopoda. " These are the Foraniinifera (at that time regarded generally as 

 microscopic Nautili, &c.) which are brought forward in the present Monograph, to be 

 illustrated, described, and put in comparison with other known Rhizopodal faunas, fossil as 

 well as recent ; the whole series having been liberally placed at our disposal. 



Mr. Wood's original collection has been enlarged by the accumulation of specimens 

 since 1835 ; but very few additional species of Foraminifera have occurred to him in his 

 continued examination of the Crag of Sutton and elsewhere. Many of the forms met 

 with by Mr. Wood have also been found by us in miscellaneous hand-specimens of Crag ; 

 and we have also some additional ones from these sources. We have taken about twenty 

 forms (mostly common) from hand-specimens of Crag in which the Cardita senilis abounds, 

 and nearly as many (mostly the same) from Crag with Cypma Islandica; the iorm&x [Cardita] 

 is very abundant at Sudbourne, as Mr. Wood informs us, and is not wanting at Ramsholt ; 

 the latter {Cyprind) prevails at both places in company with the Cardita. Some half 

 dozen varieties we met with in a piece of Crag with Ostrea ; but none of these are uncom- 

 mon. Specimens of Polyzoan Crag have afibrded thirty forms, mostly common in other 

 varieties of the Crag. Specimens of Shelly Crag from Sudbourne, Aldborough, and Ged- 



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