Quiting the more northern parts of the great Atlantic depression, we have next to consider an extensive water-space of a much shallower character. Here the volcanic masses of Iceland and the Fseroes with their submarine attachments have produced a marked effect on the depths of the ocean. The Norwegian Atlantic connects with the main Atlantic by three straits, whose central channels present the following depths at their shallowest:—

The subclass Dinosauria, as known to-day, I have divided into three orders: the Theropoda, or carnivorous forms; the Sauropoda, or herbivorous quadrupedal forms; and the Predentata, also herbivorous, and including several suborders, namely, the Stegosauria and Ceratopsia, both quadrupedal, and the Ornithopoda, containing bipedal bird-like reptiles.

In a paper published in this MagazineinMarch, 1895, Dr. J. W.Gregory, incidentally discussing the exact age of the base of the Gault Clay, wrote:“Hoplites interruptus seems restrictedin[Eastern] England to the Folkestone area and the Eed Chalk.” Although some of his conclusions on that point were modified later, the general statement quoted above, with the qualification indicated by the bracketed word ‘Eastern,’ does not seem to have been challenged. Having myself found H. interrnplus at the base of the Gault at several places in Eastern England, I have been led to look up previous records, with the result that I am convinced that the zone of H. interruptus is represented in the lowest beds of the Gault Clay over a large part of that area.