496 



tube by a transparent band with small transverse lines — a hem 

 of cell-cilia. The loose connecting tissue, building the basilar mem- 

 brane upon whicii tiie epitlielinm-oells repose, is surrounded bj a 

 transversal and by a longitudinal niuscle-lajer. 1 consider this tube 

 to be the intestinal tube. 



Dorsallj from this tube are found the large vessels, aorta and 

 vena abdominalis. In the foto (fig. I (/) the section touches the left 

 femur; at the right side the trochanter feiuoris is found. Also both 

 ureters and more caudalward the bladder is seen. 



In this way it appears that the wall of the tumour contains the 

 caudal end of an insuflicientlv developed foetus, connected to the 

 well developed ciiild by a stalk, containing the caudal end of a 

 medulla spinalis. 



I presume a double monstrum, a duplicita,s posterior is here 

 present. The single head of this monstrum was followed by a double 

 caiuiai part of the body. The one half of the body developed 

 normally. 



The other half atrophied. A relatively well developed medulla 

 remained in the stalk, the caudal end of tiie foetus was found in 

 the wall of the fluctuating tumour. 



Hence this female child cari'ied its atrophied twin-sister at her back. 

 The superfluous atrophic foetus was i-enioved and it is not impossible, 

 that the remaining child may grow up noiiually. 



ERRATUM. 



On p. 310 of this volume line 13 from the top to omit the words 

 and Wolffian Ducts and to read: by the kidney-tubules (Titschack 

 1922, a.s. 0.). 



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