231 
small but complete pygidium of Asaphus raniceps Dalm. (Length 74 
mm, breadth 11 mm) and numerous other indeterminable fragments 
of Asaphids; i.a. a fragment of an hypostome. 
In the description of the previous boulder I have already com- 
municated something about the occurrence of Asaphus raniceps Dalm. in 
the Lower Silurian deposits in Scandinavia and Russia, so that I 
now merely refer to it. 
From the above it appears, therefore that this block is to be 
classed under the older strata of the Lower-Silurian, specifically under 
one of the divisions equivalent to the Swedish Orthoceras-limestone. 
However in Scandinavia or in Bornholm no solid roek is known 
resembling this rock in any way. Starting from Reval, Bui, of 
LaMANsKky has developed itself as a calcareous limestone in the 
Western part of Estland. Fragments of this rock also occur on the 
beach of Odensholm, so that up to that locality at least this division 
retains the same petrographical character. There it has sunk already 
below the sea-level. Having no control-material of this rock I am 
unable to ascertain its similarity to this boulder. 
Moreover some boulders have been discovered, which, being 
composed of limestone, contain a variable amount of rounded quartz- 
granules and agree in age with yz, as may be gathered from the 
description of the previous species of erratics. 
I therefore believe that this piece is to be considered as a quartz- 
rich variety of the limestone with Strophomena Jentzschi Gag. and 
of the Strophomena-Jentzschi-conglomerate, especially because in the 
previous block also occurs a pygidium that belongs to the same 
Asaphus-species. 
When examining the fragment more closely with regard to a 
possible phosphorus-content, both the rock itself and the foreign 
enclosures distinctly proved to contain at least some phosphorus. The 
latter, however, did not give off any smell of bitumen when particles 
were knocked off with the hammer. Furthermore, because they are 
not fossiliferous, we cannot determine whether these fragments of 
limestone, as is the case with the erratics of the Strophomena-Jentzschi- 
conglomerate examined by ANDERSSON, are to be included ander the 
Cambrian. 
Most likely the original locality of this erratic block is that slip 
of the Baltic which covers the prolongation of the calcareous sand- 
stone in Estland and continues along the North side of Gotska 
Sandön as far as West of Gotland, thus comprising the region, 
from which the Strophomena-Jentzschi-conglomerate originates. 
