WETHERELL — ON NOUULAB CONCRETIONS IN FLINTS. 
193 
NOTICE OF THE OCCURRENCE IN FLINTS OF SMALL 
SILICEOUS NODULAR CONCRETIONS, CONTAINING 
DIFFERENT SPECIES OF FORAMINIFERA. 
By N. T. Wetherell, Esq., M.R.C.S. 
I HAVE often observed in flints from the gravel-pits in the vicinity 
of Highgate, and at Finchley, Whetstone, and Muswell-hill, small 
rounded bodies, about the size of a pea. When the flints are fractured, 
these bodies are generally broken across, and in some instances I have 
found them to contain Foraminifera.* 
Figs. 1 
A: " . 
'•►In*!*' 
Explanation of Figures. 
Y\g. I.— Section of ?L dint vith Cristellaria rolut/iia. a. Specimen not surrounded by a pea-like 
concretion. 6. Specimen surrounded by a nodular body. — Whetstone gravel-pit. 
2. Portion of a flint with two nodular bodies having hollow centres; the fossils forming the 
nuclei having disappeared. — Muswell-hill. 
_ 3, Portion of a flint having externally nodular bodies with Foraminifera in their centres. — 
.Finchley. 
4. Portion of a flint with a smooth surface, on which is visible a water-worn nodular body 
exposing a Foraminifer in the middle. 
5. Portion of broken flint with numerous sections of minute nodular bodies. — Whetstone. 
As yet, I have only seen one fossil in 
the centre of each of these small nodules, 
, and I think it is probable that the major 
, part, if not all, of them have an organic 
centre, although many, when broken, do not 
exhibit the nucleus. This, I consider, can 
be explained as follows : — The nodule may 
be fractured above the centre, as along the line a a', fig. 6 ; or below, 
as at b h'. In either of these cases, the fossil, c, in the centre, which 
Fig. 6. 
* Mr. T. Rupert Jones has, with his usual kindness, given me the names of 
several of the species — Cristellaria rolulata, Nodosaria zippei, Lituola nautiloidea, 
L. irregularis, &c. N. T. W. 
