437 



this muscle is the M. b a s i h y o - b r a ii c h i a 1 i s of the larval stages. 

 In frogs of 13 mm length the pseudothyroid lymph recess has not 

 made its appearance. The branchial cavity is still connected with 

 the mouth, but is filled with the remains of the degenerating gills. 

 No connection or relation between branchial chamber and pseudo- 



Fig. 3. A part of 

 Fig. 2 in regiou of ex- 

 tern;ü jugiüar vein, en- 

 larged, cc capillaries sur- 

 rounding the degenerating 

 fibers of the basihj^o- 

 branchialis muscle ; vcp 

 vein jjassing from the an- 

 läge of the corpus pro- 

 pericardiale to the ex- 

 ternal jugular vein. Other 

 parts as in the preceding 

 figures. 



Fig. 4. Section 

 similar to that in Fig. 3, 

 but a few sections anter- 

 ior, mdi junction of V. 

 mandibularis interna with 

 the external jugular vein ' 

 17^5 one of the veins pas- 

 sing from the region of 

 the degenerating basihyo- 

 branchialis muscle into 

 the external jugular vein, 

 later becoming a branch 

 from the pseudotliyroid 

 body. Other parts as in 

 preceding figures. 



prth 



ep 





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bhb 





sthyd 



Fis. 3. 



vt:p 



" sthy 



prth 



