368 CHARLES R. STOCKARD AND A. L. JOHNSON 



as figure 4 in plate 76. The jaws are long and slender and 

 decidedly narrowed in their anterior thirds, which can be 

 clearly seen in the ventral view (fig. 1). Two views of the 

 bassethonnd skull are shown in figures 3 and 6. This skull 

 is shorter than that of the Saluki and has a curved depression 

 in the region of the nasion; the jaws are also shorter and 

 somewhat heavier. The skull of a second generation hybrid 

 at 3 months of age is shown in figures 2 and 5. Careful in- 

 spection of these two figures shows the upper jaw of the 

 F 2 hybrid, 1908 $ , to be very Saluki-like in both lateral and 

 ventral aspects; the maxilla is long and slender and projects 

 some distance in front of the mandible. The lateral and 

 ventral views of the mandible show it to be quite distinctly 

 of the bassethound type, allowing, of course, for the puppy 

 proportions and deciduous dentition. The angle of divergence 

 between the rami and the general shape of the mandible 

 approach the bassethound. But of most importance is the fact 

 that this mandible is of proper length to function with the 

 bassethound upper jaw, and falls far short of fitting the 

 maxilla with which it is associated. Very clearly this puppy, 

 1908 $ , inherited an upper face and maxilla from the Saluki 

 in association with a mandible from the bassethound. The 

 lower canine teeth fit behind the upper canines instead of 

 in front as is normal for both the parent skulls. 



Such a case shows conclusively that the genetic bases for 

 breed quality in the two jaws of the dog's head are not one 

 and the same. It further shows that the complex of genes 

 for breed quality of the upper jaw is without linkage to the 

 factors influencing the breed type of lower jaw. In other 

 words, the hybrid individual descending from two stocks 

 with different lengths or types of jaws may inherit the upper 

 jaw from one stock in association with the different typed 

 lower jaw from the other stock. In all probability this is 

 equally as true for the race hybrids of man and other mam- 

 mals as for dogs. 



