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observe evidence of the fact that a gradual transition takes 

 place from the Foraminifera beds to the Radiolarian marls— the 

 junction beds occupying a width of about 50 yards or so 

 measured across the upturned edges of the beds at right angles 

 to the strike. From a diagram kindly furnished to me by Mr. 

 de Verteuil it appears that the line of strike of the junction beds 

 extends so far as known from Beausejour and Plaisance through 

 Cedar Grove, La Resource and Philipine, passing to the north- 

 west of Dunmore Hill. This of course is quite agreeable to all 

 former observations of the strike of the Naparima beds. 



As regards physical characteristics it may be noted that 

 the junction beds contain a larger proportion of pumice and 

 felspathic material than any other of the rocks of the 

 district that I have examined. Silicous casts of Globi- 

 gerina are another feature worthy of notice in these beds. These 

 casts of the interior of the Foraminifer are of a brilliant white 

 bristling with what look like small spines but which are casts of 

 the pores in the Globigerina Shell. In character generally as 

 well as in position the junction beds are intermediate between 

 the Foraminifera and Radiolarian beds. It is now I think 

 proved by indisputable evidence that the passage is conformable 

 and gradual. Previously we have not been able to assert this 

 fact which is one of very great importance and interest from a 

 geological point of view, and has been the source of much inquiry 

 and discussion. 



I regret not having been able to make so exhaustive an 

 examination as I could have wished. — Among the Foraminifera 

 I have identified the following. 



Globigerina bulloides. 



Biloculina depressa — one moderate example 

 Pleurostomella subnodosa — small and attenuate forms 



" brevis — a few 



Ellipsoidina subnodosa, Guppy 

 Gaudryina pupoides — two fine examples 

 Lagena — several species 

 Polymorphina horrida 



Nodosaria abysorum and perhaps two other forms 



Pullenia sphaeroides 



Pulvinulina pauperata 



Anomalina grosserugosa 



" wullerstorfi (rare and small) 



The abundance of Lagena is remarkable. Nodosaria is 

 poorly exhibited and small forms only occur. Globigerina is 

 fine and large — Pullenia is nowhere common to my knowledge, 

 but it is quite as abundant here as I have ever found it. 



