56 ABNORMAL CONDITIONS OF THE AXIS. 



them. The pharynx is laid open from the side, and a quill 

 is passed into it through each external auditory meatus. 

 Presented by the Prince de Conde. 



225. The anterior portion of a foetal Lamb, in which the head 



is represented by a pair of ears only at the anterior ex- 

 tremity of the axis. The skin has been reflected to show 

 the tympanic bullse, and the auditory meatus has been 

 opened on one side to show the membrana tympani. 

 The pharyngeal cavity has been laid open. 



Presented by Sir W. Blizard. 



226. An injected foetal Pig, in which the axis terminates in the 



same manner. The pharynx is laid open, and bristles are 

 passed on each side from the external meatus of the ear 

 into its cavity. 



A circular fold of mucous membrane divides the cavity of the 

 pharynx into two portions. The upper probably represents that 

 portion which is normally above the soft palate. The ring seems 

 to represent the soft palate ; it has been slit up in front. The right 

 lung and the liver were removed, it is stated, to show more clearly 

 the position of the remaining viscera. The intestine terminates in 

 a blind sac in the umbilical cord. There is no anus, and the 

 kidneys have coalesced in the median line. The lateral toes of the 

 hind feet are abnormally developed. 



227. A male foetal Pig with a pair of ill-developed external ears, 



and a long thin proboscis with an irregular mass of 

 cartilage in its extremity, as the only representatives of 

 the head and face. 



The right side of the back has been dissected to show that the 

 spinal column is truncated above. A minute fistula nearly an inch 

 below the ears communicated with the pharynx, but it has been 

 laid open in front with that cavity. The thoracic and abdominal 

 cavities have been exposed to show the viscera. 



Hunterian. 



Subclass II. Posterior axial arrest. 

 Syn. Monstra Syreniformia, Monopodia, et Symeliens, Geoff. 

 Just as fusion of the lateral organs of the face results from 

 arrest of the facial axis, so arrest of the posterior extremity of 

 the spine gives rise to fusion of the posterior limbs, unless their 

 growth is likewise arrested (see No. 328). In posterior axial 

 arrest the development of the viscera of the lower part of the 



