﻿NUMMULINA. 



151 



original notice of Nummidina pristina concerning its distribution. The specimens were 

 almost all found in marly calcareous shale from three distinct bands in a limestone 

 quarry, (" la Carrier e du Fond d'Jrquet") near Namur, Belgium, pertaining geologically 

 to the Calcaire cle Namur. Doubtful specimens have been met with in a somewhat 

 higher bed at Flemalle, near Liege, belonging to the Calcaire de Vise group. 



POSTSCRIPT. 



Receptaculites as a Carboniferous Foraminifer. — Mr. Lebour has drawn my 

 attention to the fact that Prof. Suess has determined the existence of Receptaculites oceani, 

 d'Eichwald, in company with Productus fimbriatus, Sowerby, and Camarophoria Suessi, 

 Suess, in the middle member of the Dobschau beds (Hungary), a deposit generally 

 recognised as of Carboniferous age {vide Lodin, 'Ann. des Mines,' ser. 7, t. vii, p. 388). 



Mr. Carter's researches on Polytrema and its allies. — Whilst the present paper has 

 been in the printer's hands an elaborate contribution to the history of an interesting 

 group of parasitic Foraminifera has appeared in the ' Annals of Natural History ' (" On 

 the Polytremata [Foraminifera], especially with reference to their Mythical Hybrid 

 Nature," by H. J. Carter, F.R.S., &c, ' Ann. and Mag. Nat. Hist.,' ser. 4, vol. xvii, 

 p. 185, pi. xiii). The observations therein recorded concerning the cancellated structure 

 of Polytrema, as distinct from the labyrinthic developments of the test in the Lituolida, 

 have considerable bearing on many of the Carboniferous species, and they have the 

 important recommendation of being based upon the examination of recent specimens of 

 considerable size. It appears from Mr. Carter's investigations that the fact of large 

 sand grains being occasionally built into the test of Stacheia polytrematoides would not 

 necessarily separate it from the genus Polytrema, but rather would indicate an affinity to 

 that type. Space permits me to do no more than direct the attention of those interested 

 in the subject to Mr. Carter's memoir. The difficulty in the case of the Carboniferous 

 forms most affected by these researches depends, unfortunately, chiefly on the specimens 

 themselves, their comparatively small size, and the changes they have undergone in the 

 process of fossilization. 



