The foregoing paper was sent to me by Dr. Linnarsson, along with a fine collection of Swedish Graptolites; and I am happy to be the medium through which his interesting observations appear before the English public. With singular acumen, the distinguished Swedish geologist has unravelled the intricacies which beset the study of the distribution of the Graptolites in past time; and his results are of peculiar importance and value. Some of these results, in so far as they especially bear upon British Geology, may just be indicated here.