CARBONIFEROUS. 
51 
Fig 1 . 1 a , a natural fracture of a large specimen a foot 
across; 1 b, magnified tubes ; 1 c, magnified surface; f. 2, 
another specimen showing the base. 
Locality. —A.—-1770. 
HELIOLITES DEPAUPERATA. 
PI. 5, fig. 3. 
On the base of one of large specimens of Chcdetes is the 
impression of a species of Heliolites. It is only a fragment, 
shewing but three or four of the round cal ices, but enough is 
present to secure the genus, and assure us the rock in which 
these corals occur is Silurian — it lies below the more shelly 
limestones. 
The calices are shallow, but distinct at the edge, about a 
line apart, and rather more than a line in diameter. In two 
out of the three visible, there are not more than ten septa, 
which reach inwards fully one-third of the diameter of the 
diaphragm. This is uneven; at least in our single and badly- 
preserved impression it appears so. 
Locality .—With the above. 
Besides these, we have many fragments of millepore corals in 
masses of limestone (marked D, 1722.) And an obscure branch¬ 
ing cup-coral may as well be referred to Cyathophyllum as to any 
other srenus. It is from the same bluish shale which encloses 
the other forms. 
I have no more to say on the Silurian fossils of these cold 
regions. Everything in the collection tends to confirm the 
view above taken, viz., that there were Silurian Sea provinces 
tenanted by like but not identical forms at the same epoch . 
For, assuredly, if palaeontological evidence be worth anything, 
the Himalayan fossils, not one of which is a North European 
species, are of Caradoc age. 
While these pages are passing through the press, Prof. T. C. 
Oldham, the Director of the Indian Geological Survey, has 
brought over his collections from the Spiti Pass, 100 miles to 
the N. West. He finds there, in slates which lie at the has 
