10 



In the sacral carrier the cartilage extends throughout to the vertebral 

 body. The rib-carriers of the tail are proportionally smaller than in 

 the larva and as in the latter occur only in the anterior half of 

 the tail (Fig. 6). 



The string of cells in the larva extending from the vertebral 



Fig. 5. 



Fig. 6. 



Fig. 5. AdultAmphiuma. Camera lucida drawing. An oblique section of the 

 distal end of the rib-carrier of the third trunk vertebra. R-T-d dorsal portion; B-T-v 

 ventral portion, os osseous tissue separating the furrows on the anterior and posterior 

 surfaces; k, k plugs of cartilage. 



Fig. 6. AdultAmphiuma. Cumera lucida drawing. A section slightly oblique 

 to the transverse plane through the anterior portion of third tail vertebra, A section 

 1 mm posterior to this shows the processes R-T and £ in bony union distally. Ä-T rib- 

 carrier; B basal stump; H haemal arch; Ao arota; u4rt. « arteria vertebralis; med medul- 

 lary tissue ; N neural arch ; con connective tissue. 



Fig. 7. Adult Amphiuma. Camera lucida drawing. A slightly oblique trans- 

 verse section of the fourth vertebra anterior to the sacrum, np neural spine; N neural 

 arch; B-T rib-carrier; Art. v arteria vertebralis; B basal stump. 



