42 



REPORT upon the FORAMINIFERA of the L. M. B. C. 



DISTRICT.* 



By John D. Siddall, Chester. 



For the preparation of the following Report very little new 

 material has been examined ; but a careful revision has been 

 made of work done previously, more particularly that for the 

 compilation of a list of the Foraminifera of the River Dee.f 

 This river is included within the district, therefore the forms 

 found there are also included in the list given below. With 

 his usual great kindness, Mr. H. B. Brady revised the Dee 

 list, and carefully examined the whole of the examples referred 

 to therein. As might be expected, the naming of a large 

 series of organisms obtained in brackish-water, but whose 

 natural habitat is the sea, was a matter of very considerable 

 difficulty. Under such altered conditions the various forms 

 do not always attain to their full development, either in size, 

 or substance, or characteristic form. Further, also, the ex- 

 amination of the River Dee was most carefully and thoroughly , 

 done. Several years were given to the work, and conse- 

 quently single examples of many interesting species were 

 found. Several of these were new to British seas ; a few 

 had only been known previously as fossil forms — one was 

 altogether new to science. Some few were so much modified 

 in form that their nomenclature was a matter of considerable 

 uncertainty. In such cases, the name given could, of course, 

 only be considered as possibly right, but not beyond doubt. 

 I have, therefore, very carefully re-examined the examples 

 then obtained, and have compared them with the figures 



* The limits of this district are— first, a line from the Isle of Man to 

 the opposite coast of Lancashire ; second, a line from the Isle of Man to 

 Holyhead (see Chart, PI. XI). 



+ Proceedings Chester Society of Nat. Science, part II, 1878, Chester. 



