TAB. IV. 



Chelone longiceps, nat. size. 



Fig. 



1 . Skull and portion of carapace. 



S2. Second neural plate. 

 •S3. Third neural plate. 



2. Portion of carapace. 



$4 — sil. Fourth to eleventh neural plates. 



ph — pis- Impressions or remains of costal plates. 



V4 — vs. Impressions of fourth and fifth vertebral scutes. 



