ON' SUPIiAREXAL P.ODIES I\ THE MOUSE. 231 



the cortical cells from the mesolilast, l)nt in connection with the walls 

 of the blood vessels (atn-ta, cardinal veins, vena cava, or vena renalis). 

 Recently for the hrst time Janosik stated that the suprarenal 

 body takes its origin from the peritoneal epithelinm, and it is in fact 

 in tlu' ch^sest connection witli tiie beo-inniiiL»- of the sexual oro-an : 

 this connection pt-'rsists i'nv a tolerably long time nntil it is cnt otF 

 by the entrance of b]o(-)d vessels, especiall}' the vena vertebralis 

 |)osteriori and other veins emptying into the same from the Wolffian 

 liodies. Weldon,"" on the other hand, derived the blastema from the 

 Wolffian 1)odies. According to his statement, a cell-mass proliferates 

 from tlie walls of the glonieriilus and separates into two masses : the 

 one travellirjg liackwards becomes the suprarenal Ijody, the other 

 growing downwards and entering the sexual organ becomes the 

 tubuli semirjiferi (in the male). Mihalcovics" also affirmed like Weldon 

 the connecti(Mi of the suprarenal Ijlastema with the sexual " strano* " 

 (=:segmental " sträng" of Jîraun), wdiidi he dci-ives, however, 

 from the germinal epithelium. At this point he agrees with JaiK^sik, 

 but ditfers in the statement that the suprarenal b(xly is only tlie 

 undiiferentiated anterior continuation of the sexual or(^an. In front 

 of the anterior end of the generative ridge the suprarenal cells are said 

 to be directly proliferated from the peritoneal epithelium, and 

 posteriorly they are said to he continuous with the sexual sträng but 

 not in direct connecti(^n with tlie peritoneal e[>ithelium. In Ijirds 

 and mammals, the direct proliferation of the peritoneal epithelium to 

 firm the suprarenal blastema is said to be confined to a very small 

 tract, so that it might be overlooked if series of sections were not 

 studied. 



8. Suprarenal Bodies of Vertebrates. Quart. Jour, of Micros. Scieneo XXV. 1885. 



9. Untersuchuuo-en über die Entwicklung des Harn- und CJe.selileehts-apparates der 

 -imnioten. Inter. Monatschr. f, Anat. u. Hist. II. 1885. 



