277 
129 
Guppy Rkpkint 
J’age 171 
observe evidence of the fact that a gradual transition takes 
])lace from the Foraminifera beds to the Radiolarian marls — the 
junction beds occup3-ing a width of about 50 3’ards or so 
measured across the u])turned edges of the beds at right angles 
to the strike. From a diagram kind!}’ furni.shed 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, pa.s.sing to the north- 
west of Dunmore Hill. This of course is quite agreeable to all 
former ob.servations of the strike of the Xaparima beds. 
As regards phj'^sical characteristics it ma\' be noted that 
the junction beds contain a larger proportion of i)umice and 
felspathic material than any other of the rocks of the 
di.strict that I have examined. Silicons ca.sts of Globi- 
gerina are another feature worthy of notice in the.se beds. These 
ca.sts of the interior of the Foraminifer are of a brilliant white 
bri.stling with what look like small spines but which are ca.sts 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 evddence that the passage is conformable 
and gradual. Previously we have not been able to assert this 
fact which is one of verj- 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 examj^le 
Plevrrostomella subnodosa — small and attenuate forms 
“ brevis — a few 
Ellip-soidina subnodosa. Guppy 
Gaudryina pupoides — two fine examples 
Lagena — several species 
Polymorphina horrida 
Nodosaria abysorum and perhaps two other forms 
Pullenia sphseroides 
Pulvinulina pauperata 
Anomalina grosserugosa 
“ wuller.storfi (rare and small) 
The abundance of Lagena is remarkable. Nodo.saria 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. 
