104 



C. M. CHILD 



The teratomorphic head (figs. 3 and 4) usually possesses an 

 apparently single median eye which histological examination 

 shows to be double in some cases, and the preocular region is 

 only partially developed or absent so that the cephalic lobes, 

 instead of being lateral are more or less anterior. Various 

 degrees of this condition are found. Figure 3 shows one of the 

 less extreme forms in which the cephalic lobes are more or less 



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anterior but separated, and figure 4 a more extreme type, where 

 the cephalic lobes are fused at the anterior end of the head and 

 only the duplication of the unpigmented sensory area shows 

 that two cephalic lobes are present 



The anophthalmic head (figs. 5 and 6) is without eyes as the 

 name implies. In this form the head appears as merely an out- 

 growth of new tissue at the anterior end, usually without dis- 

 tinguishing morphological characteristics, though occasionally 



