44 Dr. G. Baur on Meiolania. 
all the Pleurodira known the diapophysis of the second ver- 
tebra is in the middle; in all Cryptodira it ts in front; and 
so it ts tn Meiolania. 
11. “ Two adult skeletons of Testudo polyphemus” in the 
British Museum “ do not show the slightest resemblance to 
Miolania in their first and second vertebree.”’ 
I give an exact drawing of the atlas and axis of Testudo 
polyphemus (Pl. Vi. figs. 3, 4) (no. 645 Peabody Mus.) and 
of Meiolania (fig. 5) *, and leave it to the judgment of the 
readers whether they are alike or not. Besides that I give a 
description of these vertebre. 
Metolania. 
Atlas.—Intercentrum coossified with neuroids of atlas, 
between intercentrum and each neuroid a foramen. Centrum 
very short, entirely free from imtercentrum, convex in front, 
concave behind ; intercentra two, coossified with the posterior 
part of the centrum, forming two processes behind ; no face for 
neuroids on the upper part of centrum; anterior face convex, 
forming a ball, which moves in the posterior articular face 
of the atlas-ring. 
Awis—Centrum strongly emarginate behind, no keel on 
lower face ; probably concave behind; a strong diapophysis 
directly behind and below prezygapophysis, but in front of 
centrum, not in the middle; diapophyses not directed back- 
wards. 
Testudo polyphemus (typical specimen from Florida). 
Atlas.—Intercentrum coossified with neuroids in very old 
specimens ; between intercentrum and each neuroid a fora- 
men, which may be open behind. Centrum very short, 
entirely free from intercentrum, convex in front, concave 
behind ; intercentra two, coossified with the posterior part of 
centrum in old specimens (suture still visible in no. 645), 
forming two processes behind; no face for neuroids on the 
upper part of centrum; anterior face convex, forming a ball, 
which moves in the posterior articular face of the atlas-ring. 
Awis.—Centrum strongly emarginate behind, no keel on 
lower face; concave behind, a pretty strong diapophysis, ante- 
rior face a little below, posterior entirely behind prezyga- 
pophysis; in front of centrum, not in the middle.  Dia- 
pophyses not directed backwards. 
I beg to compare the figures and description of the first 
* The drawing is made from the cast; the single elements of the ver- 
tebrae are placed in the natural position. 
