127 



The supernumerary seminal funnel and seminal receptacle 

 are possibly correlated structures for we find normally and in this 

 abnormal case that the more posterior seminal funnel is in the somite 

 behind that containing the more posterior seminal receptacle. The 

 seminal funnels apparently do not develop entirely in relation to the 

 testes since in this case there is a single funnel related to a pair of 

 testes. The most posterior lateral seminal vesicle on the left side 

 would seem to have developed in relation to the seminal funnel in 

 somite 12, and not to the testes because there is no corresponding 

 vesicle on the other side, while a testis is present. 



These correlations in abnormal cases, together with the facts 

 of normal development seem to indicate that the developmental process 

 in the earthworm at any rate, may be regarded as a series of re- 

 sponses to stimuli, partly coming from the external environment 

 and also to a large extent from the interaction of the parts of the 

 embryo, one upon another. It is this latter phase of the process, 

 namely the development of parts in definite inter re- 

 lations to one another, that I would emphasize. More study of 

 variation and regeneration from this point of view would be desirable 

 and possibly lead to important results. 



Ann Arbor, Michigan, U.S.A. 

 May 25, 1900. 



Nachdruck verboten. 



reber die mesothelialeii Zotten der Allaiitois bei Schweiiis- 



embryonen. 



Von Chables S. Minot, Lt. D. 



Mit 2 Abbildungen. 



Die Allantois von jungen Schweinsembryonen bildet eigentümliche 

 zottenähnliche Auswüchse, die vom Mesothel bekleidet sind, zwischen 

 den Organen des Abdomens wachsen und auf der Höhe ihrer Ent- 

 wickelung wie Blasen aussehen. Bei der Betrachtung von Schnitten 

 springen die betreffenden Gebilde sehr in die Augen. Trotzdem 

 scheinen sie bis jetzt der Beobachtung entgangen zu sein. Doch muß 

 ich es für wahrscheinlich halten, daß Structuren so auffallender Art 

 von den älteren Embryologen schon gesehen und vielleicht sogar ab- 



