A Living Double-Headed Calf 



239 



THE UPPER JAWS AND MOUTH 



The upper jaw-bones of each mouth 

 seem quite normal except for the ab- 

 sence of the front teeth. The molars 

 in both mouths articulate in the usual 

 manner. The median double set, 

 however, are crowded against the 

 median muscular partition. The par- 

 tition protrudes slightly out of the 

 mouth (see Fig. 23) and is characterized 

 by its numerous papillae, many of 

 which are fully one- fourth 'of an inch 

 long (Fig. 23). Both tongues are normal 

 in appearance except that they are 

 attached more to the median par- 

 tition than to the outer sides. This 

 gives them an awkward inward move- 

 ment. The two tongues and the fused 

 jaws have a unified movement. The 

 movements of the parts of the mouth 

 containing no food is identical (except 

 for the slightly loose third jaw) with 

 those of the one feeding. In fact, the 

 two muscles of the tongues seem to 

 converge to a median region. 



Although the four nostrils (Fig. 23) 

 are normal, the internal structures 

 surrounding the respiratory passages 

 are very irregular. The most notice- 

 able abnormality in this region is the 

 unusually large cleft in the upper 

 palate of the right mouth, while on the 

 left side the palate is over-developed, 

 almost closing the air passage. 



Since it was not possible to study the 

 internal structure of the throat and 

 neck, further analysis was impossible. 

 It would be exceedingly interesting to 

 make a minute anatomical study of the 

 specimen under consideration so that a 

 comparison could be made with some- 

 what similar abnormalities which have 

 been described.^ 



' Albert M. Reese, "The Anatomy of a Two- 

 headed Lamb" Anat. Rec. V. 13, No. 4. 

 "The Anatomy of a Double-Cat" Anat. Rec. 

 V. 5, No. 8. 



Williams and Ranch, "Anatomy of a Double- 

 pig" Anat. Rec. V. 13, No. 5. 

 E. Carey, "Anatomy of a Double-Pig," Anat. 

 Record, Vol. 12, No. 1. 



EATING THROUGH TWO MOUTHS 



The calf is shown here eating hay with its 

 right mouth, probably because that side of its 

 head was nearer to the hay. A few straws 

 may be seen in the left mouth. (Fig.) 22. 



HOW THE JAWS ARE FUSED (Fig. 23.) 



