377 



point of contact which he describes, appearing in the same figure. 

 And in his later stages the pharyngeal bursa has come to hold 

 the very position of Seessel's pocket. Has the latter disappeared 

 and another structure arisen in its place ? I do not think this is shown 

 by Professor Huber's series of embryos. The two recesses do not 

 exist together and if his posterior point of contact takes part in the 

 formation of the pharyngeal bursa it would rather seem to do so by 

 approximation of the two points of contact which become merged 

 together. 



I have examined ferret embryos at several later stages and to 

 not find any trace of a pharyngeal bursa developing posterior to the 

 diverticulum described; and it is clear that the diverticulum does 

 develop a lymphoid structure, though it never gets further than a 

 rudimentary stage. This, and the fact of its separation from the main 

 body of the notochord, seem to me to point to its identity with the 

 pharyngeal bursa. Slight as the evidence is to base conclusions upon, 

 the point is worth recording as it b-^ars on a much disputed question. 



Professor Huber's theory of the drarwing up of the pharyngeal 

 wall at some point where the notochord touches it, to form the origin 

 of the pharyngeal bursa in the human embryo alone, does not seem 

 convincing. That the development of a structure of so little use from 

 such a primitive origin should occur in the human and in no other 

 mammal is unusual. 



I conclude then, as far as the evidence allows, that the anterior 

 end of the notochord, i. e. Seessel's pocket, loses connection in the 

 Ferret embryo with the main chorda, which at this stage ends blindly 

 close to the pharyngeal wall; and that this anterior portion develops 

 characteristics which point to its identity with the pharyngeal bursa 

 as described in human and pig embryos. 



Nachdruck verboten. 



Über den Bau der menschlichen Samenblasen. 



Von Dr. R. Picker, Budapest. 



(Aus dem I. Institute für Anatomie der kgl. ung. Universität in Budapest, 



Direktor Hofrat Professor Dr. M. von Lenhoss^k) 



lu Heft ^17^ des Anatomischen Anzeigers vom 28. Juni 1913, 

 (Band 44) ist eine gleichbetitelte Arbeit von Ernst Seifert aus dem 

 Anatomischen Institute zu Würzburg erschienen, in welcher der Ver- 



