16 ABNORMAL CONDITIONS OF THE AXIS. 



77. A similar foetal Kitten, with the skull and spinal canal opened 



to show the brain and the double medulla and cord. 



Hunterian. 



78. A similar Kitten, with the thorax and abdomen opened to 



show the viscera. There is slight anterior dichotomy 

 affecting the lower lip, mandible, and tongue, with fis- 

 sure of the palate. The alimentary canal is double from 

 the lower portion of the ileum downwards. 



Hunterian. 



79. A similar Kitten, with the thorax and abdomen opened and 



the viscera raised to show the kidneys, of which there 

 are but two, the urinary bladders, and hypogastric arteries. 



Hunterian. 



80. A similar Kitten, in which the median pair of anterior ex- 



tremities are united as far as the carpus. The upper lip 

 and palate are deeply cleft. Hunterian. 



c. Scliizocotis*. 



Under this term those forms have been classed in which, in 

 addition to complete dichotomy of the trunk, dichotomy of the 

 posterior part of the skull is apparent externally. A pair of more 

 or less developed external ears exist between the two axes, exhi- 

 biting variable degrees of fusion with one another in a manner 

 analogous to that seen in extreme cases of anterior axial defi- 

 ciency. 



81. A foetal Rabbit with slight dichotomy of the base of the 



skull. The approximate external ears are of small size ; 

 they are very defective, and are fused together. 



Hunterian. 



82. A foatal Rabbit with somewhat more considerable dichotomy 



of the base of the skull. There are a distinct pair of ad- 

 ditional ears. The roof of the skull has been removed 

 to show the extent of the dichotomy. This was one of 

 a litter of six, the remainder were normal. 



Presented by C. R. Bree, M.D., 1871. 



83. A foetal Cat with dichotomy extending to the base of the 



skull, and involving only part of the basioccipital bone. 



* Kom, the occiput. 



