88 CATALOGUE OF THE RECENT FORAMINIFEEA OF 



striato-punctata, common, and Quinqueloculina agglutinans, rare ; 

 whilst in addition to these species we have Rotalia Beccarii and 

 Nonionina depressula hoth occurring in considerable numbers. 



Such a fauna as these two lists represent is the precise counter- 

 part of that of a portion of the Post-Tertiary clay of Northamp- 

 tonshire. Mr. "W. K. Parker, who has carefully studied the 

 semi-fossilized Khizopoda of the clays immediately underlying 

 the peat in the Fen Country, had set down the area around 

 Peterborough (30 miles from the sea) as a marginal, brackish 

 water deposit ; a view which is strongly confirmed by the facts 

 now adduced. Quinqueloculina agglutinans has not before been 

 found in a recent condition in a British locality, and forms an 

 important addition to our living fauna. It can scarcely be sup- 

 posed that these are the only species which have been carried on 

 to the ground by the rise of the sea ; but rather that they have 

 been able to accept the new conditions of life whilst others with 

 less power of adaptation have died out. The very thin shells 

 and green sarcode of many of the specimens of P. striato-punc- 

 tala and N. depressula, and the scarcely more than chitinous cara- 

 pace of some of the MiliolcB show an approximation to the 

 characters of the lower fresh- water Bhizopoda. 



The number of species and varieties of Poraminifera hitherto 

 discovered on the British coast may be set down at 113 — this 

 includes many which have been found since the publication of 

 Professor Williamson's monograph. Of these, 74, or about two- 

 thirds of the entire list, have been taken off the counties of North- 

 umberland and Durham. Eleven out of the 74 forms are not 

 given by "Williamson, and they will be found figured in Plate 

 XII of the present volume, with the exception of Quinqueloculina 

 agglutinans which has been found since the plate was engraved. 

 Two are now described for the first time, and appear in the Cata- 

 logue under the names of TJingefina irregularis and Textularia 

 complexa. Pive others have not before been recorded from a 

 British locality, viz., tSpiroloculina excavata, D'Orb. ; Quinquelo- 

 culina subrotunda, Montagu; Quinqueloculina agglutinans, D'Orb.; 

 Truncatulina refulgens, Montfort ; and Nonionina Scapha, P. & M. 



