THE TRANSVERSE PROCESSES OF NECTURUS 



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takes no direct part in the formation of the rib-attachment ap- 

 paratus (fig. 30 E and F). 



Fig. 30 A series of diagrams to illustrate the development of the transverse 

 process in the anterior trunk region. Development may proceed in either of the 

 following ways :ABCForABDE. 



Fig. 31 Drawing of the lateral aspect of the first five vertebrae of an adult 

 Necturus, f.v.a., foramen for vertebral artery; d.p., dorsal process of rib-bearer; 

 r.p., ventral process of rib-bearer; p. a., parapophysis. 



8. In the trunk region the capitular head of the rib attaches to 

 the parapophysis and the tubercular head makes no connection 

 with a process of the rib-bearer (fig. 29 B and C) . 



9. In the trunk the rib-bearer fuses with the distal end of 

 the parapophysis, and as growth takes place the distal end of 



