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Fig. 1 Front view of the model of the teratological head. This shows the 

 bilateral symmetry of the head, the median eyes, and below them in the midline, 

 a depression which is a median (conjoined) external auditory meatus. The area 

 between the snouts is a mandibulomaxillary complex containing structures of 

 the left half of head A and the right half of head B, some of them conjoined, 

 some not. The embryological neck bend is shown in deep shadow, and below 

 it the anterior limb buds. X 25. 



Fig. 2 Frontolateral aspect of the same model. This shows head A in \iro- 

 file from its left side, and head B in full-face view. X 25. 



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