336 HORACE W. STUNKAED 



Von Kupffer ('06) reviewed the work of Locy and Hill and 

 maintained that the question is still unanswered. Concerning 

 Hill's work on the neuromeres of the chick, he says, ''Mit einiger 

 Ueberraschung werden wohl allgemein die Abbildungen auf- 

 genommen worden sein, mit denen Hill seine Beobachtungen 

 iiber die Primaren Neuromeren bein Hiihnchen belegt. Es 

 macht den Eindruck, als wenn das subjective Moment die 

 Fiihrung des Zeichenstiftes doch wohl etwas zu stark beeinflusst 

 hatte"; and (p. 248) ^'Ich kann diese Angaben. mangels gleich 

 ausdehnter Beobachtungen, zwar nicht bestatigen aber ich will 

 sie nicht beanstanden." Neal ('14) translated 'mangels' in 

 this last sentence to mean 4n spite of,' which somewhat alters the 

 original meaning. 



Filatoff ('07) argued that neuromeres are mechanical results, 

 due to growth in a restricted space. He rejected Hill's contention 

 that neuromeres are the chief and only certain criteria upon 

 which to build a judgment concerning the primitive metamerism 

 of the head, and agreed with Neal ('98) and Koltzoff ('01) that 

 the proper method by which to attack the problem is to establish 

 an agreement between the neural segments and the somites, 

 nerves, and gill clefts. 



Wilson and Hill ('07) could not accept the conclusions of Locy 

 and Hill, and maintained that Hill had not adequately met the 

 contention of Neal ('98). 



Belogolowy ('10) maintained that the neuromeres are only 

 form changes of uncertain nature and irregular appearance, 

 possibly the results of mechanical factors, and that they are of 

 most uncertain value as criteria of the segmentation of the head. 



Griggs ('10) sought again to establish neuromerism as a basis 

 for determining the segmentation of the head. He described 

 four neuromeres in the procephalic part of the open neural plate 

 of Amblystoma embryos, and in a few specimens of later stages 

 noted neuromeres which appear posterior to the four procephalic 

 lobes, but the history of these posterior neuromeres could not be 

 traced nor their number or arrangement determined. He agreed 

 with Locy that in the early stages the plate and neural crests 

 are net segmented in the same way; he found occasional slight 



