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Show 1890.] ON THE DOMESTIC DOG. 29 W e have already mentioned the fact that in the highly artificial broad-headed dogs, elongation of skull and palate is a sign of impure breeding, an evidence of admixture with the broad-headed strain of that of some other and narrower-headed dog. Examples of this may be seen almost any day in the streets in the shape of the half-bred Pugs, in which the elongated muzzles present so great a contrast with the short square faces of their pure-bred cousins. W e have no facts before us to prove whether the long-headed dogs such as Greyhounds tend to become broader when impurely bred, but it is highly probable that they would do so, and consequently that the dogs at both ends of the scale would, under the influence of promiscuous interbreeding, tend to approximate to the average head. We have thought that it might be useful to terminate this paper by giving a list of accessory molars noticed amongst the specimens examined, being 176 in all. In concluding we may say that the figures and calculations have been checked with care; nevertheless, in° dealing with so many figures it may be that errors may have crept in. Should such be the case we much regret it with other shortcomings of this paper. Table XXXVII.-Additional upper Molars. Variety of Dog. Eight. Left. Sheep-dog Pointer Bull-dog Bull-dog Bull-dog Esquimaux Pug Spaniel Black-and-tan Terrier (cross-bred) ... Black-and-tan Terrier (cross-bred) ... Lurcher West-Indian Dog In several of these specimens the additional molars had never been cut but lay in crypts. 1 1 1 1 1 1 ... ... 1 1 1 |
