DUPLICITY. 17 



The additional external ears are very defective and are 

 fused together. Hunterian. 



84. A similar dichotomous foetal Pig. 







d. Schizocephahis. * 



Syn. Iniops, Geoff'. 



Synkephalus asymmetros, Forster. 

 Janus -Bildung. 



This condition depends, apparently, on an extension of pos- 

 terior dichotomy still further forwards, so that it involves the 

 greater part of the base of the skull. An accessory face is 

 formed in the angle between the two axes. This face is deficient 

 in its axial parts, and hence it exhibits the phenomena of axial 

 arrest or deficiency, as fusion of the eyes and ears, agnathia, &c. 

 (See Class VI.) 



85. A foetal Pig with dichotomy of the axis extending forward 



into the basisphenoid region. The accessory face has 

 the eyes fused together as far as the edges of their irides. 

 There is a frontal proboscis above, and a pair of closely 

 approximated ears below; a condition precisely similar 

 to that seen in cases of epencephalic deficiency, i . e. defi- 

 ciency of the epencephalic region and all the parts an- 

 terior to it. (See Nos. 187 to 190.) Hunterian. 



86. A similar foetal Pig with the eyes of the accessory face di- 



stinct, but so obliquely placed that the fissures of the 

 eyelids are almost vertical. 



Presented by J. Winterbottom, Esq. 



** In the Human foetus. 

 a. Schizorhachis. 



Syn. Dipygus, Forster. 

 Deradelphus, Geoff. 



87. A female Human foetus with complete dichotomy of the spi- 



nal column, probably affecting the basioccipital region, 

 although there is no external indication of dichotomy 

 extending to the skull. There are two perfect trunks 

 united by the thorax. One of the right arms is distorted 

 at the wrist. Hunterian. 



