506 



MISS JOAN B. PROCTEJR ON TJEIE 



nineteenth, twentieth, and twenty-first vertebrte progressively 

 shoi-ter, their diapophyses elongate, slender, distally in contact 

 and supporting the iliac crests, those of the nineteenth the longest. 

 Diapophyses of anterior caudal vertebrae also elongate. Caudals 

 normal, twenty-four in number, stouter in the male than in the 

 female, according to the radiographs. 



Eibs. 



The ribs may be considered as absent in the adult, the part 



Text-figure 15. 



Bony carapace of an adult, from within (f nat. size), showing vertebrfe, and 

 vestigial ribs. (Ribs not entirely absorbed in this specimen.) * 



normally adherent to the carapace having become completely 

 absorbed. The free or capitular portion is sometimes present as 



* Sutures between costal plates 2, 3 and marginal plates 4, 5, accidentally omitted. 



