10 ABNORMAL CONDITIONS OF THE AXIS. 



a. Diprosopus, Gurlt. 

 Syn. Monocranus, Gurlt. 



Diprosopus is the term applied to those forms of anterior 

 dichotomy in which fission does not extend to any of the ver- 

 tebrae. This condition often accompanies posterior dichotomy. 

 Examples are seen in Nos. 90 to 94. In its lesser forms it is 

 called Monocranus by Gurlt. 



49. A Kitten with dichotomy of the anterior part of the face ; 



one mouth is very imperfect. There is a single pair of 

 eyes. Hunterian. 



50. A Kitten with dichotomy of the head extending further back 



than in the last, so that there are four eyes. The eyelids 

 of the median eyes have no inner commissures, but are 

 united and bound in a single fissure. Hunterian. 



51. A foetal Kitten with more considerable anterior dichotomy. 



The laminae of the vertebrae and spinal cord are deficient 

 in the lumbar region. Hunterian. 



52. The head of a foetal Pig with dichotomy of the anterior part 



of the face ; the mandible, tongue, and the anterior portion 

 of the maxillary bones are double. There is a consider- 

 able fissure in the palate, from which a fibrous band ex- 

 tends to the united mesial rami of the mandible. A por- 

 tion of skin covered with hair, representing the median 

 cheeks, is lodged in the fissure in the palate. 



Hunterian. 



53. The head of a foetal Pig with considerable dichotomy of the 



lower, and slight dichotomy of the upper jaw, dissected to 

 show the accessory masseter muscles. The tongue is 

 double ; the other parts are single. This specimen before 

 dissection exhibited only what appeared to be a second 

 mouth in the cheek. 



54. An anencephalous foetal Pig with more considerable anterior 



dichotomy than the last, producing a single median eye. 



Purchased. 



55. The head of a Calf with anterior dichotomy extending as far 



back as the presphenoid bone. The muzzles are united 

 by a thick fold of integument almost to their extremities. 



