408 



TRANSACTIONS OF THE AMERICAN PHILOSOPHICAL SOCIETY 



rostral denticles represent the illicium itself, it is difficult to account for the appearance of 

 the pre-dentary denticles in the mandible, as already implied by Beebe (1929, p. 27). 



That the illicium itself has disappeared in Rhynchocer alias is suggested by the fact that 

 in the related Haplophryne the illicium, while still present, is minute. Its basal bone, 



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Haplophryne hudsonius 



Fig. 280. Haplophryne hudsonius. A. Sketch of type. B. Sketch from photograph of type published by Beebe. 



however, is present and gives attachment to the three pairs of illicial muscles (Beebe, 1929, 

 p. 35). Doctor Parr endeavors (1930<:, p. 15) to dispose of this difficulty by two assump- 

 tions: (1) that the so-called illicium of Haplophryne hudsonius might just as well represent 

 the second and third tentacles as the first. But as to this, I have seen this little illicium in 



