IV 



MUSCLE-BUDS 



207 



during development. According to Mollier (1893) and Braus (1899) 

 such a process actually occurs. Broad anastomoses or bridges ui.tkr 

 their appearance connecting the various radial muscle rudiments 



76 1 



78 /S/V , / 





B 



30 31 32 33.34^35^36 



op 29 30 .31 32 33 



n 



34 



35 



36 



37 



38 



39 



40 



41 





Kit;. 114. Illustrating the muscularizatiou of the pelvic iin in Spinax. 

 (After Braus, 1899.) 



A, -20 mm. (70 mt'sodcrm se.yt s. ) : I?, _'.-> nun. (74 m.s.); C. 2(i mm. ; l>, :<-J mm. The myotomes an- 

 inilit-ated by Arabic numerals. The muscle-buds are shown in black, those within the fin rudiment 

 briii- iiimilifivd with Roman numerals. The nerve-trunks are shown with double contour. 



with their neighbours near their proximal ends. These connecting 

 bridges persist for a short time and then disappear. According 

 to the authors mentioned they are the expression of a cellular 

 interchange taking place between neighbouring muscle rudiments. 



