In Group D are two skulls characterised by their breadth of face, a greater development of the sagittal crest and a more massive structure generally. It is a matter of no difficulty to distinguish these two skulls from the others. From the prominence of the sagittal crest the skulls must have belonged to animals which were possessed of considerable muscular power of the jaws. The skull of the modern bull-terrier is very similar in form and size.

Group E is represented by only a portion of one skull; the right zygoma and the anterior part of the face have unfortunately been broken away. This skull is placed by itself because, though it has reached its full state of development, it is peculiarly small when compared with the others of the collection. Compared with skulls of the present-day domestic dog, its place is found near the fox-terrier or the English black-and-tan terrier. The cranium is characterised by a high degree of antero-posterior curvature. The skull is evidently that of a member of a small breed of dog and one which was possessed of a short, sharp and narrow face, not unlike that of a 'badly-bred' fox-terrier.