624 



3827. The cranium and horns of the Long-horned variety of the Common Ox (Bos 

 Taurus). Hunterian. 



3828. The skull of a male or bull of the Short-horned or Guernsey variety of the 

 Bos Taurus. Presented by the Very Rev. Dr. Auckland, F.R.S. 



3829. The skull of the hornless variety of the Common Ox (Bos Taurus, var.). 



A rugged, slight protuberance at the posterior and outer angle of each of the elongated 

 frontal bones is the sole indication of the characteristic processes or horn-cores in this variety. 

 It may be remarked that, although the full size and mature dentition have been acquired, the 

 suture between the exoccipitals, and that between these and the superoccipital, remain distinct. 

 The whole of the upper surface of the cranium is formed by the frontals : the parietals, which, 

 at an earlier period, encroach upon the back part of the upper surface, are now pushed quite 

 to the posterior or occipital aspect. 



Presented by Henry Cline, Esq. 



3830. The cranium of the hornless variety of the Common Ox (Bos Taurus). 



Not any rudimentary tubercle has been developed at the outer angle of the frontal bone. 

 The left alveolar process of the upper jaw has been diseased. The parts of the occipital bone 

 have coalesced. 



Purchased. 



3831. The skull of a young heifer of the hornless variety of Bos Taurus. 



It has only acquired the first true molar of the permanent series of teeth in both jaws. 

 The second true molar was cutting the gum : none of the deciduous molars are shed. The 

 summits of the lobes of the last true molar are exposed on the right side of the upper jaw ; 

 two of the lobes of the right lower molar are similarly exposed. The rest of the matrix of 

 these teeth has remained uncalcified. Calcification of the matrices of the premolars had not 

 commenced. The length of the skull in a straight line is fourteen inches. 



Purchased. 



3832. The skull of a variety of the Common Ox (Bos Taurus), which is propagated 

 in the Pampas of South America. 



It is remarkable for the stunted development of the nasals, premaxillaries, and fore part of 

 the lower jaw, which is unusually curved upwards to come into contact with the premaxillaries. 

 The nasal bones are about one-third the ordinary length, but retain almost their normal breadth. 

 The triangular vacuity is left between them, the frontal, and the lacrymal, which latter bone 

 articulates with the premaxillary, and thus excludes the maxillary from any junction with the 

 nasal. The horns are developed from the frontal, where it forms the outer angles of the 

 superoccipital ridge. The mature dentition has been acquired in this specimen. 



Presented by Charles Darwin, Esq., F.R.S. 



