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number, some thinking this is three, while others place it as high as 

 seven ; three or four being, perhaps, the figures at present most in favor, 

 though Viallanes, who has recently discussed the subject, considers six, 

 the number suggested by Huxley, as the most probable. Cholodkowsky 

 is of a similar opinion." 



Packard ('98, p. 54) gives six : — 



Upon anatomical grounds, different observers have recognized from 

 one to seven head segments. As mentioned by Packard ('98, p. 50), 

 Burmeister found but two ; Carus and Audouin three ; MacLeay, New- 

 man, and Newport four ; Straus-Dnrckheim seven. Huxley ('78, p. 343) 

 said : " It is hardly open to doubt that the mandibles, the maxillse, and 

 the labium answer to the mandibles and the two pairs of maxillfe of the 

 crustacean mouth. In this case, one pair of antennary organs found in 

 the latter is wanting in insects, as in other air-breathing Arthropods, 

 and the existence of the corresponding somite cannot be proved. P)ut if 

 it be supposed to be present, though without any appendage, and if the 



